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67h2hq | Did primitive human groups have 'leaders'? And if so how were the 'leaders' decided? | Edit: By primitive I mean pre-civilization, like Neanderthal time. | askscience | {
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} | Did primitive human groups have 'leaders'? And if so how were the 'leaders' decided?
Edit: By primitive I mean pre-civilization, like Neanderthal time. | [
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7jecsu | Do we all see the same color when looking at the same thing? | We all know the grass is green, but could someone's "green" be someone else's red or blue? Do other people see things in various different colors but associate that color by the same name we've always known it as? | askscience | {
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} | Do we all see the same color when looking at the same thing?
We all know the grass is green, but could someone's "green" be someone else's red or blue? Do other people see things in various different colors but associate that color by the same name we've always known it as? | [
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3xp92g | AskScience AMA series: I'm Lee Feinberg, Optical Telescope Element Manager for NASA's James Webb Space Telescope; we're installing the primary mirror on the Space Telescope, AMA! | We're in the midst of assembling the massive primary mirror of the James Webb Space Telescope (which is comprised of 18 gold-coated segments) at NASA's Goddard Space Flight Center in Greenbelt, Maryland. JWST is an engineering challenge, and when complete, this cutting-edge space telescope will be a giant leap forward ... | askscience | {
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} | AskScience AMA series: I'm Lee Feinberg, Optical Telescope Element Manager for NASA's James Webb Space Telescope; we're installing the primary mirror on the Space Telescope, AMA!
We're in the midst of assembling the massive primary mirror of the James Webb Space Telescope (which is comprised of 18 gold-coated segments)... | [
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54j0f3 | Is there an empirical method to calculate the surface area of an irregular solid? | Archimedes (apocryphally, at least) provided us with an empirical method of calculating the volume of an irregular solid using water displacement.
Is there any analogue for surface area? It would be nice if there were a method that doesn't rely too much on technology (I kinda want something that could've been produced... | askscience | {
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} | Is there an empirical method to calculate the surface area of an irregular solid?
Archimedes (apocryphally, at least) provided us with an empirical method of calculating the volume of an irregular solid using water displacement. Is there any analogue for surface area? It would be nice if there were a method that doesn'... | [
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1vl4w8 | What is the best pattern to use in order to cut an object into the most number of pieces in the fewest number of cuts? | For example, say I wished to cut a circular pizza into as many pieces as possible in 10 seconds, given that I can make 1 cut each second. What would be the best way to do this?
Moreover, is there a formula that can be applied to any number of cuts in order to maximize the number of pieces?
Also, does this change when... | askscience | {
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} | What is the best pattern to use in order to cut an object into the most number of pieces in the fewest number of cuts?
For example, say I wished to cut a circular pizza into as many pieces as possible in 10 seconds, given that I can make 1 cut each second. What would be the best way to do this? Moreover, is there a for... | [
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n9o0m | What is the 'catch' with wireless power, like 'witricity'? | _URL_0_
I saw this system, what is the catch that we aren't seeing to a system like this or should we start getting excited about wireless power? | askscience | {
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"It's a lot less effecient than connecting the device with a cable.\n[Electromagnetic Induction](_URL_0_)",
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"url": [
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} | What is the 'catch' with wireless power, like 'witricity'?
_URL_0_ I saw this system, what is the catch that we aren't seeing to a system like this or should we start getting excited about wireless power? | [
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3hu84c | AskScience AMA Series: We’re a state epidemiologist and a state public health laboratory scientist – together we are a critical outbreak fighting team! Ask us anything! | We’re Dr. Sara Vetter and Dr. John Dunn – thanks for having us! We’re here to talk about how [public health laboratory](_URL_4_) scientists and [epidemiologists](_URL_1_) work closely to create your state’s critical outbreak-fighting team. While your health care provider will focus on treating your illness, public heal... | askscience | {
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"https://www.linkedin.com/pub/john-dunn/39/305/7bb",
"http://www.aphl.org",
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} | AskScience AMA Series: We’re a state epidemiologist and a state public health laboratory scientist – together we are a critical outbreak fighting team! Ask us anything!
We’re Dr. Sara Vetter and Dr. John Dunn – thanks for having us! We’re here to talk about how [public health laboratory](_URL_4_) scientists and [epidem... | [
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4iuo06 | What does the Falcon 9 use to stabilize itself when landing? | What we see on camera [here](_URL_0_) seems physically impossible, as it looks like the rocket is only being propelled from the bottom, making it practically impossible to counteract net torque. When it comes down it's like trying to balance a pen its tip: any slight deviation will make it fall over.
Does it have som... | askscience | {
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"Falcon 9 uses a combination of grid fins, cold gas thrusters, and thrust vectoring of the main engines. The main engine thrust vectoring only works when the main engine is firing (during boostback/rentry and on final landing)... | {
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"http://www.spacex.com/sites/spacex/files/fins_extended.jpg",
"https://en.wikipedia.org/wiki/Control_moment_gyroscope",
"https://en.wikipedia.org/wiki/Inverted_pendulum",
"htt... | What does the Falcon 9 use to stabilize itself when landing?
What we see on camera [here](_URL_0_) seems physically impossible, as it looks like the rocket is only being propelled from the bottom, making it practically impossible to counteract net torque. When it comes down it's like trying to balance a pen its tip: an... | [
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poes0 | Why does water seem to be such a unique substance? (Sorry, very vague). | How come water seems to have all the very unique properties (acts like acid/base, adhesive/lubricant, AFAIK every living thing needs it to survive). Thanks!
Edit: Sorry I didn't respond, I was asleep. Thanks for all the helpful responses!
Edit 2: Cool! Front page! Thanks guys! | askscience | {
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"http://www.lsbu.ac.uk/water/index2.html",
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} | Why does water seem to be such a unique substance? (Sorry, very vague).
How come water seems to have all the very unique properties (acts like acid/base, adhesive/lubricant, AFAIK every living thing needs it to survive). Thanks! Edit: Sorry I didn't respond, I was asleep. Thanks for all the helpful responses! Edit 2: C... | [
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7nui3t | Can you track a radioactive golf ball with a Geiger counter? | What type and level of radiation would you need to locate a lost radioactive golf ball with a Geiger counter (range at least 10 meters)? | askscience | {
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} | Can you track a radioactive golf ball with a Geiger counter?
What type and level of radiation would you need to locate a lost radioactive golf ball with a Geiger counter (range at least 10 meters)? | [
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ainu8v | For those with ASD, can people move along the spectrum as they age? Can people become higher- or lower-functioning as time goes on, and if so, which has been seen to be more common? | [deleted] | askscience | {
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} | For those with ASD, can people move along the spectrum as they age? Can people become higher- or lower-functioning as time goes on, and if so, which has been seen to be more common?
[deleted] | [
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av3p0r | how does red shift show that the big bang theory could be a possible theory, for the formation of the universe? | askscience | {
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"url": [
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} | how does red shift show that the big bang theory could be a possible theory, for the formation of the universe?
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k2749 | What's your favorite "unsolved mystery" in science? | askscience | {
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554k2z | Are any of Einstein's predictions yet unproven, and if so, which would be the most groundbreaking if proven correct? | Over 100 years after they were predicted by General Relativity, gravitational waves were observed by LIGO last year. Are there any more of his predictions floating out there? | askscience | {
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"Gravitational waves were only recently detected directly; we've had pretty good indirect evidence for many years.\n\nI would nominate hidden variable theory. Einstein never really accepted quantum mechanics as a fundamental t... | {
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} | Are any of Einstein's predictions yet unproven, and if so, which would be the most groundbreaking if proven correct?
Over 100 years after they were predicted by General Relativity, gravitational waves were observed by LIGO last year. Are there any more of his predictions floating out there? | [
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1eu126 | This article says that cold fusion has been cracked. I don't believe it. | For one, there's no sources in the article, no quotes from the scientists that have supposedly been convinced. Second, even without sources the article admits that nothing has been officially peer-reviewed.
But as far as the science goes, I don't know if it's completely far-fetched nonsense, or if it's actually a kin... | askscience | {
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"url": [
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} | This article says that cold fusion has been cracked. I don't believe it.
For one, there's no sources in the article, no quotes from the scientists that have supposedly been convinced. Second, even without sources the article admits that nothing has been officially peer-reviewed. But as far as the science goes, I don't ... | [
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rrf31 | What is worse, using a notebook made out of trees to take notes, or using the energy of powering a laptop? | askscience | {
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"When you take notes on a... | {
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} | What is worse, using a notebook made out of trees to take notes, or using the energy of powering a laptop?
| [
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1axqrz | A question about pupil shape | If you ever look closely at most cattle, sheep, and goats, you notice that their eyes, or rather their pupils, are shaped like rounded, horizontal rectangles. Why is this? And why, of all the millions of other animals in the world, do octopuses share this trait? Does it allow for a different wavelength of light? Does i... | askscience | {
"a_id": [
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"This is an awesome question. [Here's a paper](_URL_0_) reviewing some characteristics of pupil design. It may not be exhaustive.\n\nTo start, note that the refractive index of a clear substance like the lens is dependent on the wavelength o... | {
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} | {
"url": []
} | {
"url": [
"http://ge.tt/5isbK3c/v/0",
"http://www.science20.com/variety_tap/evolution_rectangular_eye",
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]
} | A question about pupil shape
If you ever look closely at most cattle, sheep, and goats, you notice that their eyes, or rather their pupils, are shaped like rounded, horizontal rectangles. Why is this? And why, of all the millions of other animals in the world, do octopuses share this trait? Does it allow for a differen... | [
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130fru | [X-Post from /r/cringe] Man proposes million dollar idea, gets laughed at. Is what he's saying scientifically valid? | [Here's the link to the clip.](_URL_0_)
I don't have much of a degree in physics/chemistry, so I'm not sure if he's bullshitting or not. Can anyone explain to me if what he's saying is the truth? | askscience | {
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} | {
"url": [
"http://www.youtube.com/watch?feature=player_detailpage&v=4tQZmooQc28#t=1079s"
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} | {
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} | [X-Post from /r/cringe] Man proposes million dollar idea, gets laughed at. Is what he's saying scientifically valid?
[Here's the link to the clip.](_URL_0_) I don't have much of a degree in physics/chemistry, so I'm not sure if he's bullshitting or not. Can anyone explain to me if what he's saying is the truth? | [
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oilgp | How did people find out they were pregnant in medieval times? | ..Or were they even able to find out before the woman began to 'show'? I've wondered this for a long time..a lot of times when reading books about midwives and such, they mention having a midwife go in for a look to find out if a woman was pregnant. Before a woman begins to show, are there any other visible changes to ... | askscience | {
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} | {
"url": []
} | {
"url": [
"http://www.snopes.com/pregnant/rabbit.asp"
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} | How did people find out they were pregnant in medieval times?
..Or were they even able to find out before the woman began to 'show'? I've wondered this for a long time..a lot of times when reading books about midwives and such, they mention having a midwife go in for a look to find out if a woman was pregnant. Before a... | [
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2l7m1l | Are there any bodily functions that are dependent on gravity? | Does my body work the same without gravity? | askscience | {
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"There was a post recently that said that your sensation of the need to urinate doesn't work the same in zero G. Normally you feel an urgent need to urinate when your bladder is one third full. In space, astronauts found they didn't get that... | {
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} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Spaceflight_osteopenia",
"http://en.wikipedia.org/wiki/Effect_of_spaceflight_on_the_human_body",
"http://en.wikipedia.org/wiki/Peristalsis",
"http://bio1152.nicerweb.com/Locked/media/ch50/50_11EarEquilibrium-L.jpg"
]
} | Are there any bodily functions that are dependent on gravity?
Does my body work the same without gravity? | [
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135gd4 | In 2008 NASA announced they had detected a breach in the Earth's magnetosphere through THEMIS. Has any more info or knowledge come about through learning this? | I'm a 4th year physics/astronomy undergrad interested in solar physics, particularly how the activity on the sun influences our magnetosphere.
In December of 2008 NASA posted [an article](_URL_0_) with the news but to this day I cannot find anything else out.
Has any progress been made in understanding this? Are an... | askscience | {
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"This was kind of a cool result, though I wish they'd actually put something out in the peer-reviewed literature first. It took a couple of years for the paper to come out.\n\nThe basic result is that THEMIS seems to have identified surpris... | {
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} | {
"url": [
"http://science.nasa.gov/science-news/science-at-nasa/2008/16dec_giantbreach/"
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"http://www.nasa.gov/mission_pages/themis/auroras/aurora_live.html",
"http://www.nasa.gov/mission_pages/them... | In 2008 NASA announced they had detected a breach in the Earth's magnetosphere through THEMIS. Has any more info or knowledge come about through learning this?
I'm a 4th year physics/astronomy undergrad interested in solar physics, particularly how the activity on the sun influences our magnetosphere. In December of 20... | [
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zsund | Before I began stretching I couldn't reach my toes. After 3 weeks of stretching exercises I can reach 6 inches past my toes. On cellular level what is happening? | Have new cells been added to my muscles ligaments and tendons adding to their length and thus reach? Or perhaps the exercise has helped align unorganized muscle fiber? What is my connective tissue doing when I tug on my muscles for extended periods of time.
I measured nearly a 10.5 inch increase in range of motion, i... | askscience | {
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"url": []
} | {
"url": [
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"https://www.youtube.com/watch?v=jqy0i1KXUO4&list=UUX6b17PVsYBQ0ip5gyeme-Q&index=5&feature=plcp"
]
} | Before I began stretching I couldn't reach my toes. After 3 weeks of stretching exercises I can reach 6 inches past my toes. On cellular level what is happening?
Have new cells been added to my muscles ligaments and tendons adding to their length and thus reach? Or perhaps the exercise has helped align unorganized musc... | [
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sqbjo | Why doesn't fast food spoil, and should I care? | Hi, I saw yet another "look, these hamburgers from McDonald's that I bought 2 years ago and left on the counter haven't spoiled or degraded!" post making the rounds on facebook. Basically, it's something like: _URL_0_
The obvious subtext is "if nothing else will eat it, neither should you."
Being a skeptical kind of ... | askscience | {
"a_id": [
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"text": [
"The problem is the cited experiment is bad science.\n\nThe fast food in the example doesn't \"spoil\" because it dehydrates. If you do the same test but put the McDonalds in a warm, moist, dark place then it rots just as well as anything el... | {
"url": []
} | {
"url": [
"http://boingboing.net/2008/09/25/immortal-mchorror-bu.html"
]
} | {
"url": [
"http://aht.seriouseats.com/archives/2010/11/the-burger-lab-revisiting-the-myth-of-the-12-year-old-burger-testing-results.html"
]
} | Why doesn't fast food spoil, and should I care?
Hi, I saw yet another "look, these hamburgers from McDonald's that I bought 2 years ago and left on the counter haven't spoiled or degraded!" post making the rounds on facebook. Basically, it's something like: _URL_0_ The obvious subtext is "if nothing else will eat it, n... | [
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aacr4u | National grid: When demand outstrips supply, why does the frequency drop rather than the voltage/current? | I’ve heard that in the UK when there are massive demands for power (or a generator goes offline) the mains frequency dips, why isn’t it the voltage or the current that decreases?
Thanks | askscience | {
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"Two things:\n\n1) frequency of mains current is set by the frequency of turbines spinning in generators connected to the grid.\n\n2) generator turbines receive a \"back emf\", a force resisting their motion proportional to the load in the c... | {
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"url": []
} | National grid: When demand outstrips supply, why does the frequency drop rather than the voltage/current?
I’ve heard that in the UK when there are massive demands for power (or a generator goes offline) the mains frequency dips, why isn’t it the voltage or the current that decreases? Thanks | [
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l0lwe | 10th Grade Chemistry teacher needs your help with some science questions. | I would like to offer my students an extra credit writing assignment that encourages them to look into peer-reviewed journals/papers on topics that might possibly interest them. The scope of the paper is to encourage students to critically evaluate a scientific explanation or hypothesis using scientific evidence and me... | askscience | {
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"url": []
} | {
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} | 10th Grade Chemistry teacher needs your help with some science questions.
I would like to offer my students an extra credit writing assignment that encourages them to look into peer-reviewed journals/papers on topics that might possibly interest them. The scope of the paper is to encourage students to critically evalua... | [
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b500dk | How do optometrists get prescription for babies? | Just saw the cutest post on r/wholesomegifs of a baby getting glasses and being able to see clearly for the first time. I see these posts often but I always wonder how they get the eyeglass prescription right for babies?
Normally eye doctors ask you the “is 1 or 2 better” question 15 times but babies can’t answer tha... | askscience | {
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"text": [
"Optometrist here. If its possible due to the baby's cooperation, then autorefraction. Its a machine that measures Rx and is often in the ballpark. Most doctors wouldn't stop there though and would also do re... | {
"url": []
} | {
"url": []
} | {
"url": []
} | How do optometrists get prescription for babies?
Just saw the cutest post on r/wholesomegifs of a baby getting glasses and being able to see clearly for the first time. I see these posts often but I always wonder how they get the eyeglass prescription right for babies? Normally eye doctors ask you the “is 1 or 2 better... | [
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6wkcrn | [Computer Science] In neural networks, wouldn't a transfer function like tanh(x)+0.1x solve the problems associated with activator functions like tanh? | I am just starting to get into neural networks and surprised that much of it seems to be more art than science. ReLU are now standard because they work but I have not been shown an explanation why.
Sigmoid and tanh seem to no longer be in favor due to staturation killing the gradiant back propagation. Adding a small l... | askscience | {
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"First of all, it is absolutely NOT a dumb idea. It's good that you're considering alternative activation functions. Most people just accept that there are certain ac... | {
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"url": [
"http://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/ia64/fpu/s_tanh.S;hb=56bc7f43603b5d28437496efb32df40997c62cb4",
"https://scholar.google.nl/citations?view_op=view_citation&hl=en&citation_for_view=pDIuuVwAAAAJ:UebtZRa9Y70C",
"https://scholar.google.nl/citations?view_op=view_citat... | [Computer Science] In neural networks, wouldn't a transfer function like tanh(x)+0.1x solve the problems associated with activator functions like tanh?
I am just starting to get into neural networks and surprised that much of it seems to be more art than science. ReLU are now standard because they work but I have not b... | [
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7lvx69 | Could you have FTL but no time travel if your FTL could only take you to places that were in the future (or simultaneous) according to a fixed universal reference frame? | So there would be some sort of aether that, although irrelevant for any known physics, everything could be measured as moving "relative to". With the reference frame of this aether determining the "future" according to this FTL method.
To break it down, 1: Is this even coherent? 2: Is there somehow still a way to do t... | askscience | {
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"text": [
"There is no \"fixed, universal reference frame\"; it doesn't exist. But anyway, if your worldline only ever intersects events in the absolute future, you are by definition not movi... | {
"url": []
} | {
"url": []
} | {
"url": []
} | Could you have FTL but no time travel if your FTL could only take you to places that were in the future (or simultaneous) according to a fixed universal reference frame?
So there would be some sort of aether that, although irrelevant for any known physics, everything could be measured as moving "relative to". With the ... | [
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r20ff | Dear Reddit, blacksmith needs advice on a sundial. | I am an apprentice blacksmith and i have been asked to make a Sundial as a 100h project. It is to be exhibited at the [Three Counties Show](_URL_0_) 15-17 June, hopefully I will sell it there as well.
I don't want to make this post too lengthy so here is the question:
What is the angle of the gnomon in relation to ... | askscience | {
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"text": [
"The angle of the gnomon with the horizon should be equal to the latitude. This way, on average, it will be about perpendicular to the Sun and will cast the stronges... | {
"url": []
} | {
"url": [
"http://www.threecounties.co.uk/threecounties"
]
} | {
"url": [
"http://en.wikipedia.org/wiki/File:Garden_sundial_MN_2007.JPG",
"http://en.wikipedia.org/wiki/File:Beijing_sundial.jpg",
"http://www.jgiesen.de/GeoAstro/sundials.html",
"http://www.wherry.com/photos/2001-04-29-chicago/DSCN1215-m.jpg",
"http://www.instructables.com/id/Pocket-Sundial-1/",... | Dear Reddit, blacksmith needs advice on a sundial.
I am an apprentice blacksmith and i have been asked to make a Sundial as a 100h project. It is to be exhibited at the [Three Counties Show](_URL_0_) 15-17 June, hopefully I will sell it there as well. I don't want to make this post too lengthy so here is the question: ... | [
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5kz519 | Discussion: Smarter Every Days newest YouTube video on Prince Rupert Drops VS Bullets! | So you may have seen the Smarter Every Day video about [Prince Rupert Drops](_URL_1_) but today Destin is doing something even neater.
Prince Rupert Drops are so tough that even a hammer hitting them cannot break the glass. Destin finds out in [this video](_URL_0_) if a bullet has enough force or if the drop will win.... | askscience | {
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"text": [
"Hey guys, Destin here. Happy to answer questions about the setup if that's helpful.",
... | {
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"url": [
"https://www.youtube.com/watch?v=24q80ReMyq0",
"https://www.youtube.com/watch?v=xe-f4gokRBs"
]
} | {
"url": [
"http://i.imgur.com/2Dwb8xb.png",
"https://youtu.be/CaYq9sX4zLs?t=492",
"https://youtu.be/CaYq9sX4zLs?t=501",
"http://i.imgur.com/e6Nl5On.png",
"https://youtu.be/24q80ReMyq0?t=273"
]
} | Discussion: Smarter Every Days newest YouTube video on Prince Rupert Drops VS Bullets!
So you may have seen the Smarter Every Day video about [Prince Rupert Drops](_URL_1_) but today Destin is doing something even neater. Prince Rupert Drops are so tough that even a hammer hitting them cannot break the glass. Destin fi... | [
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ihbiz | I have this "electric disc" that causes capacitive touch sensors to spaz out. Do you have any idea why this happens? Video inside. | _URL_0_
I honestly have no clue, and I couldn't find any information on this. | askscience | {
"a_id": [
"c23raj2",
"c23r3vr",
"c23rz45",
"c23tbtc"
],
"text": [
"That disc opperates the same way as the plasma balls - very high frequency electrical discharge from an electrode in the middle knock electrons up to a higher energy state in the surrounding gas, and they emit light as they d... | {
"url": []
} | {
"url": [
"http://www.youtube.com/watch?v=Q3R2_VGgets"
]
} | {
"url": [
"http://en.wikipedia.org/wiki/Plasma_globe"
]
} | I have this "electric disc" that causes capacitive touch sensors to spaz out. Do you have any idea why this happens? Video inside.
_URL_0_ I honestly have no clue, and I couldn't find any information on this. | [
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236m5g | Is this a dumb idea to fix roads in wintery places? | I live in WI. Our roads get decimated every winter largely because the frost penetrates deep in the ground causing frost heaves, cracks and holes. What if we spray foamed the first layer of road before adding the rebar, rock and pavement. Would that stop the frost penetration and lengthen the life of muh roads? | askscience | {
"a_id": [
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"cgue3xd",
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],
"text": [
"It's not so much the water penetrating the pavement, but the water in the ground under the pavement freezing and causing the road to \"heave\" and bend more than intended, and crack. once a crack forms, water s... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://building.dow.com/na/en/applications/geotech/index.htm",
"http://ascelibrary.org/doi/abs/10.1061/40836\\(210\\)62"
]
} | Is this a dumb idea to fix roads in wintery places?
I live in WI. Our roads get decimated every winter largely because the frost penetrates deep in the ground causing frost heaves, cracks and holes. What if we spray foamed the first layer of road before adding the rebar, rock and pavement. Would that stop the frost pen... | [
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mods9 | Do Chimpanzees feel shame? | askscience | {
"a_id": [
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"c32kisd",
"c32k3t8",
"c32jz5i",
"c32jpan"
],
"text": [
"A (paywalled) study _URL_2_ affirms what others have said: animals, and not just chimpanzees, can and do feel emotions, including shame.\n\nThere is one anecdotal yet relevant story involving a female chimpanze... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://books.google.com/books?id=gb35_pWmcDwC&pg=PA190#v=onepage&q&f=false",
"http://en.wikipedia.org/wiki/Washoe_(chimpanzee)",
"http://www.bioone.org/doi/abs/10.1641/0006-3568(2000)050%5B0861:AEEPN%5D2.0.CO;2"
]
} | Do Chimpanzees feel shame?
| [
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2p9wky | How does a hypothetical Alcubierre drive solve any problems with relativity at all? | It seems to me that the "Alcubierre drive" doesn't actually solve any problems that it attempts to. It's supposed to allow faster than light travel because the spaceship using it isn't actually moving with respect to the space around it, but why does that matter? The space inside the bubble including the ship, would... | askscience | {
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"text": [
"It can still be used to communicate back in time as part of a \"tachyonic anti-telephone.\" If two things outside each others' light cones can communicate (it doesn'... | {
"url": []
} | {
"url": []
} | {
"url": []
} | How does a hypothetical Alcubierre drive solve any problems with relativity at all?
It seems to me that the "Alcubierre drive" doesn't actually solve any problems that it attempts to. It's supposed to allow faster than light travel because the spaceship using it isn't actually moving with respect to the space around it... | [
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3x26js | Do you really need to manually circulate the air in microgravity to not be enclosed in a bubble of carbon dioxide? | There was a [TIL](_URL_1_) today referring to an [ESA site on daily astronaut life](_URL_0_). There was some controversy whether this is actually a thing, and a lot of misinformed opinions on all sides.
So, does one actually need to have a constant external ventilation going to stir the air up enough to distribute the... | askscience | {
"a_id": [
"cy0z1eo",
"cy18nwn",
"cy19zqe"
],
"text": [
"Yes. You can do an experiment on earth to prove it.\nWe did this one in primary school...\n\nYou need:\nA small candle, a birthday candle works well. \nA large screw top jar. \nGood reflexes or a soft mat. \n\nStick the candle to the inside... | {
"url": []
} | {
"url": [
"http://www.esa.int/Our_Activities/Human_Spaceflight/Astronauts/Daily_life",
"https://www.reddit.com/r/todayilearned/comments/3x1jie/til_astronauts_have_to_sleep_near_a_ventilator/"
]
} | {
"url": [
"http://arstechnica.com/science/2014/09/the-little-known-soviet-mission-to-rescue-a-dead-space-station/"
]
} | Do you really need to manually circulate the air in microgravity to not be enclosed in a bubble of carbon dioxide?
There was a [TIL](_URL_1_) today referring to an [ESA site on daily astronaut life](_URL_0_). There was some controversy whether this is actually a thing, and a lot of misinformed opinions on all sides. So... | [
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ovgnj | Help save my marriage, answer this question before my wife and I kill each other over it. | A man is standing in a infinitely tall sealed plane that is 30 meters long filled with regular air, he is at the midpoint of the 30 meters. The plane is being propelled by a constant force forward. The man jumps straight upward, and leaves contact with the plane. Assume that the man leaps up with enough initial velocit... | askscience | {
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],
"text": [
"Here's a thought experiment that answers the exact same question.\n\nImagine you're on a plane flying through the air at 500 miles per hour doing a crossword puzzle while sitting down. If you dro... | {
"url": []
} | {
"url": []
} | {
"url": []
} | Help save my marriage, answer this question before my wife and I kill each other over it.
A man is standing in a infinitely tall sealed plane that is 30 meters long filled with regular air, he is at the midpoint of the 30 meters. The plane is being propelled by a constant force forward. The man jumps straight upward, a... | [
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b568vz | If you have a hypothetical quad-copter that has a 24 hour battery life, is unaffected by the elements and had a clear path. Would it be possible for it to make a full rotation of the Earth while hovering in one place? | askscience | {
"a_id": [
"ejbu2ie",
"ejbxnby",
"ejbyct2"
],
"text": [
"Hypothetically, yes. But it would need to be travelling westwards at about the speed of sound.\n\nThe circumference of the Earth close to 40,000 km (almost by definition). The Earth rotations every 23 hours 56 minutes. So the speed at the e... | {
"url": []
} | {
"url": []
} | {
"url": []
} | If you have a hypothetical quad-copter that has a 24 hour battery life, is unaffected by the elements and had a clear path. Would it be possible for it to make a full rotation of the Earth while hovering in one place?
| [
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1wx737 | Is 98.6 just an Average body temperature? Do different parts of the body run at different temps or is it consistent throughout? | 98.6 Fahrenheit to clarify. And I'm wondering if for instance my arm is operating colder than my leg, or pancreas. | askscience | {
"a_id": [
"cf67c66",
"cf677p3",
"cf6fst5"
],
"text": [
"Most people's body temperatures actually fluctuate quite a bit during the course of each day. This is why when your temperature is elevated to, say, 99.6 or so, it's typically not a cause for concern. Following the normal circadian rhythm, ... | {
"url": []
} | {
"url": []
} | {
"url": []
} | Is 98.6 just an Average body temperature? Do different parts of the body run at different temps or is it consistent throughout?
98.6 Fahrenheit to clarify. And I'm wondering if for instance my arm is operating colder than my leg, or pancreas. | [
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4eqvmd | When you find the sin of a cosine of a tangent of an angle - for any number so long as it's in degrees and not radian - why does the answer always approach 0.0174? | It can be done with any number, so long as you don't find the sin of a sin, or the cos of a cos, or the tan of a tan
What I mean is, you can do sin(cos(tan(sin(cos(tan(x))))))) for any combination of sin, cos, tan and get 0.0174 so long as there are no sin/cos/tan adjacent to each other. Why does this happen? | askscience | {
"a_id": [
"d22ohin",
"d238r0t",
"d238u6y"
],
"text": [
"That's a rather bizarre pattern to have found on your own. But there is a good reason why that happens. Define the function f(x) by\n\n > f(x) = sin(λcos(λtan(λx)))\n\nwhere λ = π/180. The factor of λ is needed so that we can enter *x* in ... | {
"url": []
} | {
"url": []
} | {
"url": [
"https://en.wikipedia.org/wiki/Banach_fixed-point_theorem",
"https://www.wolframalpha.com/input/?i=cos(tan(x+degrees\\)+degrees\\",
"https://www.wolframalpha.com/input/?i=sin(cos(sin(sin(cos(tan(x+degrees\\)+degrees\\",
"https://www.wolframalpha.com/input/?i=sin(x+degrees\\),+tan(x+degrees\... | When you find the sin of a cosine of a tangent of an angle - for any number so long as it's in degrees and not radian - why does the answer always approach 0.0174?
It can be done with any number, so long as you don't find the sin of a sin, or the cos of a cos, or the tan of a tan What I mean is, you can do sin(cos(tan(... | [
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md6l2 | If a 10^22 eV (~the energy of a well hit baseball) cosmic ray hit your body would it hurt? | This came up in my high energy physics class this morning and we couldn't reach a consensus since none of us knew anything about biology. Would it have to hit a neuron for you to feel it? Or would the induced particle shower just fly out of your body without you feeling it? Would it just dislodge a nucleus? | askscience | {
"a_id": [
"c2zyrwr",
"c2zzllr",
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"c3013qr"
],
"text": [
"A particle that energetic is only going to deposit a fraction of its energy in your body. For example, CERN uses a ~~concrete wall over 3 meters thick as a beam stop for its protons.~~ see reply by nxpnsv\n\nThe specific res... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Alpha_strike_%28engineering%29"
]
} | If a 10^22 eV (~the energy of a well hit baseball) cosmic ray hit your body would it hurt?
This came up in my high energy physics class this morning and we couldn't reach a consensus since none of us knew anything about biology. Would it have to hit a neuron for you to feel it? Or would the induced particle shower just... | [
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25lgn9 | If everything is made out of particles, wouldn't words written on a piece of paper eventually shift? | Wouldn't the particles move around causing the ink/lead to shift? | askscience | {
"a_id": [
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"chiecc0",
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],
"text": [
"There are materials in which the particles are free to shift around arbitrarily; they're called fluids, and we don't generally write things in them that we need to last. What makes a material solid is that the ... | {
"url": []
} | {
"url": []
} | {
"url": []
} | If everything is made out of particles, wouldn't words written on a piece of paper eventually shift?
Wouldn't the particles move around causing the ink/lead to shift? | [
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k47j6 | How long could you survive off only drinking Mt. Dew and not eating anything? | Xposted from askreddit seems this may be a better place for this question. Mt. Dew has a caloric value from sugar so your body would be getting some nutrition but how long could you survive without any other real food or water? | askscience | {
"a_id": [
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],
"text": [
"You are precisely describing [kwashiorkor](_URL_0_) which is protein deficiency with adequate caloric intake, normally in the form of carbohydrates (sugar in the case of Mountain Dew).\n\nHow long you survive would be dependent almost entir... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Kwashiorkor"
]
} | How long could you survive off only drinking Mt. Dew and not eating anything?
Xposted from askreddit seems this may be a better place for this question. Mt. Dew has a caloric value from sugar so your body would be getting some nutrition but how long could you survive without any other real food or water? | [
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1z1ucm | Do insects/arachnids/ other arthropods respond to Pavlovian conditioning? Can they be trained in some other way? | What the title says. Just curious. No, I'm not asking this because I recently learned you can buy Mantis egg cases and want to train a mantis attack army. That's rediculous... Stop looking ^at ^me ^^like ^^that... | askscience | {
"a_id": [
"cfpvzmh",
"cfpy85e",
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],
"text": [
"Yes and yes.\n\n[Pavlov's Cockroach: Classical Conditioning of Salivation in an Insect](_URL_0_), and here's a paper talking about training fruit flies using operant conditioning: [Reward learning in normal and mutant Drosoph... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0000529",
"http://www.pnas.org/content/80/5/1482.short",
"http://www.sciencedaily.com/releases/2005/10/051021120542.htm"
]
} | Do insects/arachnids/ other arthropods respond to Pavlovian conditioning? Can they be trained in some other way?
What the title says. Just curious. No, I'm not asking this because I recently learned you can buy Mantis egg cases and want to train a mantis attack army. That's rediculous... Stop looking ^at ^me ^^like ^^t... | [
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rp45r | If there was no water on Earth would it feel any different at the bottom of the Mariana Trench than it does on top of the Empire State Building? | I know air has a weight but would you be able to feel a difference between 7.017 miles (depth of the Trench and the height of the building)?
Edit...
Here's an example without the water. One of the base camps on Everest is at 18,192 ft. The Dead Sea is 1,371 ft below sea level. The difference is 3.7 miles. So can you ... | askscience | {
"a_id": [
"c47ipn5",
"c47iur5",
"c47jhsu",
"c47mein"
],
"text": [
"The air pressure at -7 miles would be about 3.3 times the air pressure at sea level or the pressure 23 meters under the surface of the sea.",
"Once all the water is gone the atmosphere will, of course, come to rest at a l... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Geoid",
"http://en.wikipedia.org/wiki/Gravity_of_Earth#Depth",
"http://goo.gl/ncTQB",
"http://en.wikipedia.org/wiki/US_Standard_Atmosphere",
"http://nopr.niscair.res.in/bitstream/123456789/2506/1/IJRSP%2037\\(1\\)%2064-67.pdf",
"http://aero.stanford.edu... | If there was no water on Earth would it feel any different at the bottom of the Mariana Trench than it does on top of the Empire State Building?
I know air has a weight but would you be able to feel a difference between 7.017 miles (depth of the Trench and the height of the building)? Edit... Here's an example without ... | [
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nrk66 | Have other animals ever been observed using currency or bartering with other members of the same species in the same way humans do? | askscience | {
"a_id": [
"c3bdf38",
"c3bdqw1",
"c3be8zd",
"c3big75",
"c3bg9qf"
],
"text": [
"I'm not in the field, but a few years ago a study made it into the popular press where economists were studying currency use in tamarins. They basically trained the monkeys to use tokens as currency by teaching... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://www.nytimes.com/2005/06/05/magazine/05FREAK.html?pagewanted=all",
"http://www.livescience.com/3462-chimps-barter-sex.html",
"http://www.youtube.com/watch?v=kXR_ycRctdM"
]
} | Have other animals ever been observed using currency or bartering with other members of the same species in the same way humans do?
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yo3nz | Is it possible to not "see" a tangible object? | Hallucinations are defined as "an experience involving the perception of something not present", so I was wondering if it were possible for a human to not "register" something that is physically present? | askscience | {
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} | Is it possible to not "see" a tangible object?
Hallucinations are defined as "an experience involving the perception of something not present", so I was wondering if it were possible for a human to not "register" something that is physically present? | [
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7km8ss | Why is it so common for groups of animals to become unable to breed after being seperated for a few hundred thousand or million years? What kind of changes make breeding impossible across species? | askscience | {
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7bsv2d | AskScience AMA Series: We are climate scientists here to talk about the important individual choices you can make to help mitigate climate change. Ask us anything! | Hi! We are Seth Wynes and Kimberly Nicholas, authors of a recent scientific study that found the four most important choices individuals in industrialized countries can make for the climate are not being talked about by governments and science textbooks. We are joined by Kate Baggaley, a science journalist who wrote ab... | askscience | {
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"http://www.newsweek.com/antarctica-melting-below-mantle-plume-almost-hot-yellow... | AskScience AMA Series: We are climate scientists here to talk about the important individual choices you can make to help mitigate climate change. Ask us anything!
Hi! We are Seth Wynes and Kimberly Nicholas, authors of a recent scientific study that found the four most important choices individuals in industrialized c... | [
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ahacri | Why can there be no proper subfields of Z/pZ? | I'd like to start off by saying I've tried googling but have not found a satisfactory proof yet. This is probably because I'm misunderstanding something about fields.
& #x200B;
My theory book says:
& #x200B;
> Let K be a field. A subfield of K is a subset of K containing 0 and 1, which is closed under addition, ... | askscience | {
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I'd like to start off by saying I've tried googling but have not found a satisfactory proof yet. This is probably because I'm misunderstanding something about fields. & #x200B; My theory book says: & #x200B; > Let K be a field. A subfield of K is a subset of K containing 0 ... | [
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am210f | AskScience AMA Series: We are vertebrate paleontologists who study crocodiles and their extinct relatives. We recently published a study looking at habitat shifts across the group, with some surprising results. Ask Us Anything! | Hello AskScience! We are paleontologists who study crocodylians and their extinct relatives. While people often talk about crocodylians as living fossils, their evolutionary history is quite complex. Their morphology has varied substantially over time, in ways you may not expect.
We recently published a [paper lookin... | askscience | {
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Hello AskScience! We are paleontologists who study crocodylians and their extinct relatives.... | [
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1jvjr9 | How fast am I going? | I am sitting perfectly still. But the planet is rotating and revolving. The solar system is doing the same thing in the galaxy. The galaxy is hurtling through space. How fast am I going?
Bonus questions: All motions described above stop. We all get thrown out into space. How fast do we travel? Will we escape the atmos... | askscience | {
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I am sitting perfectly still. But the planet is rotating and revolving. The solar system is doing the same thing in the galaxy. The galaxy is hurtling through space. How fast am I going? Bonus questions: All motions described above stop. We all get thrown out into space. How fast do we travel? Will... | [
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6stbrs | How come otorhinolaryngology is a single discipline if it concerns three different body parts? Are these connected in some way? Are there other examples of specialties that include multiple minor subspecialties? | askscience | {
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3qjssx | AskScience AMA Series: Graduate and Professional School AMA | Hi everyone!
We have a lot of panelists here to help answer your questions about any and all post-undergraduate schools. We have a wide range of disciplines, career trajectories, and countries covered. As some may be thinking about pursuing advanced degrees right about now, we thought this AMA would give you the chanc... | askscience | {
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Hi everyone! We have a lot of panelists here to help answer your questions about any and all post-undergraduate schools. We have a wide range of disciplines, career trajectories, and countries covered. As some may be thinking about pursuing advanced degrees ri... | [
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tu6p8 | Cloud 9... Is it possible? | askscience | {
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19btq3 | Quick Multiverse Theory Question | Whenever someone discusses a multiverse, they will usually phrase the possibilites of outcomes by saying something along the lines of an 'either or scenario': In this universe Tom Brady throws a touchdown, but in an alternate universe he throws an interception. But aren't there an infinite number of ways he could do ei... | askscience | {
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7uj7vy | Why is it possible to ground an electrical device by connecting it to the Éarth? | Where does the electrical energy and charge go? Is it possible for the Earth to become saturated at some point in the future? | askscience | {
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} | Why is it possible to ground an electrical device by connecting it to the Éarth?
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n0nji | Time Delay as Something Moves Further and Further Away from you. | Imagine a rocket leaves Earth travelling at half the speed of light on a journey to Proxima Centauri, which is 4.2 light years away. If you are watching it constantly, when it leaves everything appears to be moving in real time, however as it gets further and further away, light takes longer to reach you. My question i... | askscience | {
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3nuudd | Why hasn't the air speed record been beat since 1976? | [removed] | askscience | {
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mifa3 | How does man create objects and instruments with a greater degree of accuracy/precision than the instruments used to make it? | How did we go from simple tools like a hammer, for instance, to something as refined as the large hadron collider?
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38pxid | If I had a 1 dollar coin, could I theoretically flatten it to the point where the coin would cover the entire Earth? | Also would the atom need to subdivide? What would happen at that point?
Edit: looking at such a large discussion about coins and atoms stemmed off from one question that I had is the weirdest feeling ever. | askscience | {
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} | If I had a 1 dollar coin, could I theoretically flatten it to the point where the coin would cover the entire Earth?
Also would the atom need to subdivide? What would happen at that point? Edit: looking at such a large discussion about coins and atoms stemmed off from one question that I had is the weirdest feeling eve... | [
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64wgn3 | A conductive cable over a light-year long is connected to a positive & negative pole, how long until current flows? | Assuming an infinitely large power source for the current. What would the electrical dynamics be if a cable capable of carrying the current from the (-) end to the (+) end starting the second of creating the complete circuit?
Do these electrical dynamics breakdown at some point of scale?
At this scale could w... | askscience | {
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} | {
"url": []
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"url": []
} | A conductive cable over a light-year long is connected to a positive & negative pole, how long until current flows?
Assuming an infinitely large power source for the current. What would the electrical dynamics be if a cable capable of carrying the current from the (-) end to the (+) end starting the second of creating ... | [
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4w22k6 | With an estimated 1,000,000 nematode species, what distinguishes them all? | I was on a Wikipedia safari, and read that there are 25,000 known nematode species, and 1,000,000 estimated total species.
I'm wondering what could possibly distinguish between 1,000,000 variations of a little worm. Could someone explain the minimal distinguishing characteristics of a species of nematode? | askscience | {
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"Many of the distinctions are on the genetic level. Two worms may look the same to the unaided eye and even live in the same habitat, but be vastly different genetically and totally unable to crossbreed.",
"Nematodes are found everywher... | {
"url": []
} | {
"url": []
} | {
"url": []
} | With an estimated 1,000,000 nematode species, what distinguishes them all?
I was on a Wikipedia safari, and read that there are 25,000 known nematode species, and 1,000,000 estimated total species. I'm wondering what could possibly distinguish between 1,000,000 variations of a little worm. Could someone explain the min... | [
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c2c2oh | When I point my contactless IR thermometer straight up, what am I taking the temperature of? | It's currently 85 degrees F on the ground here at 10 pm at night. That's the current nighttime air temperature. It's also the temperature I get when I point the IR thermometer at the grass on the ground. When I point my contactless IR thermometer straight up it registers 57 degrees F. That temperature increases as I po... | askscience | {
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"You are measuring the infra-red radiation given off by gasses in the atmosphere. Many atmospheric gasses give off infra-red - mostly it is the water vapor. But as the IR they give off is very different from the IR given off as black-body ra... | {
"url": []
} | {
"url": []
} | {
"url": [
"https://en.wikipedia.org/wiki/Optical_depth",
"https://github.com/hdrake/IntuitiveGreenhouse/blob/master/figures/IntuitiveGreenhouseEffect.mp4"
]
} | When I point my contactless IR thermometer straight up, what am I taking the temperature of?
It's currently 85 degrees F on the ground here at 10 pm at night. That's the current nighttime air temperature. It's also the temperature I get when I point the IR thermometer at the grass on the ground. When I point my contact... | [
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4j8ulh | Am i correctly following Newton's Laws? | I recently just got into physics (I'm 16) and was told that the earth (gravitationally) is just as attracted to us as we are to it (around 9.8m/s^2) If this is the case, using f=ma or a=f/m i came to the conclusion that the earth accelerates towards us at a speed of approximately 1.633333 x 10^-24 metres per second squ... | askscience | {
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"Mass of earth (M) = 5.972×10^24 kg\n\nGravitational constant (g) = 6.67408 × 10-11 m3 kg-1 s-2\n\nYour mass (m) = 80 kg\n\nRadius of earth (R) = 6.371×10^6 m\n\nThe magnitude of the gravitational force that Earth exerts on you (and vice ver... | {
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"url": []
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"url": []
} | Am i correctly following Newton's Laws?
I recently just got into physics (I'm 16) and was told that the earth (gravitationally) is just as attracted to us as we are to it (around 9.8m/s^2) If this is the case, using f=ma or a=f/m i came to the conclusion that the earth accelerates towards us at a speed of approximately... | [
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4sz0mr | I noticed Nice, France looks very tropical. It is at 43 degrees N. I'm in Portland, ME...hardly tropical at 43 degrees N. How is this? Is it because of the Mediterranean? | askscience | {
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"This [paper](_URL_1_) disputes the claim that the Gulf Stream is largely responsible (although their climate models indicate that it does have an effe... | {
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} | {
"url": []
} | {
"url": [
"http://www.americanscientist.org/Libraries/images/20066110140_866.jpg",
"http://www.americanscientist.org/issues/pub/the-source-of-europes-mild-climate",
"http://www.americanscientist.org/Libraries/images/20066110455_866.jpg",
"http://www.livescience.com/13573-east-coast-colder-europe-west... | I noticed Nice, France looks very tropical. It is at 43 degrees N. I'm in Portland, ME...hardly tropical at 43 degrees N. How is this? Is it because of the Mediterranean?
| [
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of5y7 | The basic units... | Ok so to preface my question I do consider myself semi-competent when it comes to scientific material and understanding.
This question is probably simple to answer for someone and I am embarrassed to have to ask it, but it is one of those moments where my mind is sort of stuck and unable to extrapolate my scientific k... | askscience | {
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"Its a hard question to answer too. A cell is going to contain proteins, lipids, cytoplasm, DNA, RNA and numerous ions and solutes. Each of these parts of the cell have a molecule structure, based on the number and type of ato... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Amino_acid"
]
} | The basic units...
Ok so to preface my question I do consider myself semi-competent when it comes to scientific material and understanding. This question is probably simple to answer for someone and I am embarrassed to have to ask it, but it is one of those moments where my mind is sort of stuck and unable to extrapola... | [
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2wu9lz | In between the numbers 1 and 1,000 (including those numbers), what single digit number occurs the most often? | As a follow up question, how many times does this digit occur? | askscience | {
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"1.\n\nConsider the numbers from 1 to 9, each digit occurs once (except for the 0). Similarly, from 10 to 19, each digit occurs once plus we have ten extra 1's. From 20 to 29 the same, but ten extra 2's. An so o... | {
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} | {
"url": []
} | {
"url": [
"http://www.forbes.com/sites/danielfisher/2014/05/30/the-simple-mathematical-law-that-financial-fraudsters-cant-beat/"
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} | In between the numbers 1 and 1,000 (including those numbers), what single digit number occurs the most often?
As a follow up question, how many times does this digit occur? | [
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2ixu0a | What exactly is "Information"? | In many other posts they say that information can not travel faster than the speed of light, but what exactly is information and what can be considered not information. | askscience | {
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"At its most fundamental, information is any propagation of cause and effect... | {
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} | {
"url": []
} | {
"url": [
"https://www.goodreads.com/book/show/8701960-the-information",
"http://en.wikipedia.org/wiki/Information_theory",
"http://en.wikipedia.org/wiki/Work_%28thermodynamics%29",
"http://en.wikipedia.org/wiki/Faster-than-light#Quantum_mechanics",
"http://en.wikipedia.org/wiki/Work_%28physics%2... | What exactly is "Information"?
In many other posts they say that information can not travel faster than the speed of light, but what exactly is information and what can be considered not information. | [
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k5vpg | A lone man is dying of thirst in the middle of a desert. How much more time does one glass of water buy him? | Just wondering if a small amount of water would do much to help someone who is dying of dehydration? Or if by that point, would it be hopeless without medical intervention? | askscience | {
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"It depends real... | {
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} | {
"url": []
} | {
"url": []
} | A lone man is dying of thirst in the middle of a desert. How much more time does one glass of water buy him?
Just wondering if a small amount of water would do much to help someone who is dying of dehydration? Or if by that point, would it be hopeless without medical intervention? | [
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u0ef7 | plausible interstallar travel | askscience | {
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"If you have a propulsion system that lets you gain a large percentage of light speed relative to your initial port, then the trip will feel much shorter for the people the trip. The next star could be reached in what seems like six months a... | {
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} | plausible interstallar travel
| [
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kt0xn | "Banking" umbilical cord blood - Is there any evidence that paying a facility to keep your newborn's hematopoietic stem cells is a good idea? | I feel like maybe someday I'll be glad I did it. At the same time, I also feel like maybe I'm being scammed by people taking advantage of my fear and ignorance. | askscience | {
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"text": [
"[Absolutely](_URL_2_). Though scientists are making rapid advancement in developing techniques for creating stem cells from the cells of adults, cord blood still appears to be the easiest source of stem cells. Given the future prospects for... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Cord_blood#Controversy",
"http://web.archive.org/web/20060926115915/http://www.worldmarrow.org/fileadmin/WorkingGroups_Subcommittees/DRWG/Cord_Blood_Registries/WMDA_Policy_Statement_Final_02062006.pdf",
"http://en.wikipedia.org/wiki/Cord_blood#Use_and_applications"... | "Banking" umbilical cord blood - Is there any evidence that paying a facility to keep your newborn's hematopoietic stem cells is a good idea?
I feel like maybe someday I'll be glad I did it. At the same time, I also feel like maybe I'm being scammed by people taking advantage of my fear and ignorance. | [
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2q2umr | Is there a unit to describe the speed that time passes? | Such as the speed of time when at rest vs. moving near the speed of light or moving close to a large gravitational body? | askscience | {
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"The unit of time is the second. A \"speed\" is defined as how a variable changes per unit time. Therefore, within a sing... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Gravitational_time_dilation",
"http://en.wikipedia.org/wiki/Horology"
]
} | Is there a unit to describe the speed that time passes?
Such as the speed of time when at rest vs. moving near the speed of light or moving close to a large gravitational body? | [
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2wz7ni | How can a modern processor draw 130 watts in power at 1.1 volts or so? | If you do the math you will end up with am amperage of around 100 amps or so. Which I find it hard to believe, maybe the processor draws multiple voltages and the higher ones contribute to most of the power. | askscience | {
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"It really does draw 100 amps.\n\nIf you look at the pinout of a modern processor, you will see that there are hundreds of pins dedicated to power and ground - so no one pin has to carry all that current.",
"There is circuitry on the mot... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://i.imgur.com/C6im1Ay.png"
]
} | How can a modern processor draw 130 watts in power at 1.1 volts or so?
If you do the math you will end up with am amperage of around 100 amps or so. Which I find it hard to believe, maybe the processor draws multiple voltages and the higher ones contribute to most of the power. | [
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oox5p | Is it possible to fashion a "stone" for a ring from graphite? | Some Background: As a chemistry nerd-girl at heart I've grown up in meager conditions and have always joked with my boyfriend that an engagement ring with graphite would mean more to me than one of diamond.
I am curious though, *is this possible*?
No luck through searching google about such items. Plus, I'd like a l... | askscience | {
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"Graphite is extremely soft. \n\nI suppose that you could encase it in a transparent shell, but otherwise it wouldn't last long. \n\n[Edit] Go with Buckminsterfullerene ....",
"You could go halfway - [Mossianite](_URL_0_... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Moissanite",
"http://www.ceramisis.com/carbons_graphites_a1.htm"
]
} | Is it possible to fashion a "stone" for a ring from graphite?
Some Background: As a chemistry nerd-girl at heart I've grown up in meager conditions and have always joked with my boyfriend that an engagement ring with graphite would mean more to me than one of diamond. I am curious though, *is this possible*? No luck th... | [
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3egnfd | How do we communicate with space crafts so quickly? | I read in Event Horizon thread that it takes us 4.5 hrs to receive messages from Pluto. After some Googling I found one source that says Pluto is 13 light hours away and another that said it was 327 minutes away (5.5 hrs). First off, which is it? Secondly, If it takes light at least 5.5 hrs to travel that distance, how... | askscience | {
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"text": [
"they do travel at the speed of light, or near enough to make no difference to us. (technically they slow down in our atmosphere, but thats like a milimeter to a marathon, so not worth calculating.\n\nThe rest has to be inconsistent sources.... | {
"url": []
} | {
"url": []
} | {
"url": []
} | How do we communicate with space crafts so quickly?
I read in Event Horizon thread that it takes us 4.5 hrs to receive messages from Pluto. After some Googling I found one source that says Pluto is 13 light hours away and another that said it was 327 minutes away (5.5 hrs). First off, which is it? Secondly, If it takes... | [
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nllht | What happens to extra current in the power grid? | If power stations are generating x kw and the power grid is only drawing y kw where y < x, how does the grid handle this extra current? I suppose the same question applys for a generator. If I am powering my house from a 10,000 watt generator and my house only draws 5,000 watts, what happens to that extra current? | askscience | {
"a_id": [
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"text": [
"Electric companies have developed all kinds of ways to store this 'extra' energy. One very efficient way is to [use giant flywheels](_URL_0_). You basically crank up a big heavy wheel to absurdly high speeds. Later, you can use that flyw... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Flywheel_energy_storage",
"http://www.youtube.com/watch?v=6GiIVze2Tac",
"http://en.wikipedia.org/wiki/Peaking_power_plant"
]
} | What happens to extra current in the power grid?
If power stations are generating x kw and the power grid is only drawing y kw where y < x, how does the grid handle this extra current? I suppose the same question applys for a generator. If I am powering my house from a 10,000 watt generator and my house only draws 5,00... | [
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1c51i6 | When a cheetah runs down a gazelle at 60+ mph, what keeps them from getting hurt in the resulting 60 mph crash? | I understand the stop is not so sudden as a car crash, but at that speed I would still expect to be hurt if I fell off a bicycle.
Or am I wrong and they *do* get hurt but just take a few days to heal up after a successful hunt?
| askscience | {
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} | {
"url": []
} | {
"url": [
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"http://www.youtube.com/watch?v=B5PhwIxVnck"
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} | When a cheetah runs down a gazelle at 60+ mph, what keeps them from getting hurt in the resulting 60 mph crash?
I understand the stop is not so sudden as a car crash, but at that speed I would still expect to be hurt if I fell off a bicycle. Or am I wrong and they *do* get hurt but just take a few days to heal up after... | [
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13mhv9 | Is it true that the North Sea and the Baltic Sea have a "border"? | _URL_0_
\^Alright, so I've seen this picture a lot, with people saying that it's the place the North Sea and the Baltic Sea meet, accompanied with text claiming that the waters never mix. I know that the waters obviously mix, there's no way that it could be a perfect border, but I was wondering if this is a special ph... | askscience | {
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"url": [
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"http://en.wikipedia.org/wiki/Antarctic_Convergence",
"http://en.wikipedia.org/wiki/Thermohaline_circulation"
]
} | Is it true that the North Sea and the Baltic Sea have a "border"?
_URL_0_ \^Alright, so I've seen this picture a lot, with people saying that it's the place the North Sea and the Baltic Sea meet, accompanied with text claiming that the waters never mix. I know that the waters obviously mix, there's no way that it could... | [
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44067n | Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology | Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on **Economics, Political Science, Linguistics, Anthropology**
Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big ... | askscience | {
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"text": [
"To me a $15 minimum wage seems like an arbitrary number thrown out to the people as a catch all fix it. My problem is not with the idea of raising minimum wage but i... | {
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} | {
"url": [
"http://www.reddit.com/r/askscience/search?q=flair%3A%27meta%27&restrict_sr=on&sort=new&t=all",
"http://www.reddit.com/r/askscience/wiki/index#wiki_answering_askscience",
"https://www.reddit.com/r/askscience/comments/3exo6p/askscience_panel_of_scientists_xiii/"
]
} | {
"url": [
"http://wwwnc.cdc.gov/travel/notices/watch/carnival-mardi-gras-2016"
]
} | Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology
Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on **Economics, Political Science, Linguistics, Anthropology** Do you have a question within these topics you weren't sure was worth submitting? Is something... | [
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iihk3 | In quantum uncertainty, you sometimes here people say "we altered it by observing it," however, isn't the alteration somehow the result of the tools we must use to measure such small particles? | In the double-slit experiment, when they measured which slit the electron went through, it behaved as a particle. My question is, what device exactly did they use to measure it? | askscience | {
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"url": []
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"url": []
} | In quantum uncertainty, you sometimes here people say "we altered it by observing it," however, isn't the alteration somehow the result of the tools we must use to measure such small particles?
In the double-slit experiment, when they measured which slit the electron went through, it behaved as a particle. My question ... | [
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ih79d | What is the difference between time and matter? | We all know that time is linear and that time is interconnected with matter. When matter change it does so over time. And we calculate and see time as matter is changing.
What is the difference between the two?
And how are they dependent on each other?
Would any of them exist without the other? | askscience | {
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} | {
"url": []
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"url": []
} | What is the difference between time and matter?
We all know that time is linear and that time is interconnected with matter. When matter change it does so over time. And we calculate and see time as matter is changing. What is the difference between the two? And how are they dependent on each other? Would any of them e... | [
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4es7zo | What are some of Newton's less famous discoveries? | askscience | {
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"Although he his best known for his theoretical and mathematical work, he did some of the most rigorous optics experiments to date, leading to his book Optiks. These typically involved scattering light through prisms and lenses and the like,... | {
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} | {
"url": []
} | {
"url": [
"https://books.google.com.br/books?id=4gGAgHcKX6YC&pg=PA41&lpg=PA41&dq=newton+geology&source=bl&ots=W4F0xHPzBL&sig=cXFTZNG37X9hon9JkAsxstFqEC0&hl=pt-BR&sa=X&ved=0ahUKEwjk5q3jwo_MAhUJlpAKHSRCACIQ6AEIVDAH#v=onepage&q=newton%20geology&f=false"
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} | What are some of Newton's less famous discoveries?
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3ggv5g | What would happen to a human body if it was exposed to say 2000°C for just a 1000th of a second? | The body (person would be alive) would be exposed to this temperature only for a 1000th of a second then it would return to normal bodytemperature. Would this short time be enough to destroy DNA, cells etc.?
What would happen? And for other time intervals?
Thank you for your answers! | askscience | {
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"It would have to do with what kind of medium the temperature was being carried through. That makes a difference because it'll determine how much energy is transferred to the body. Air wouldn't transfer very much because the thin layer of ai... | {
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"url": [
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"http://twt.mpei.ac.ru/MCS/Worksheets/WSP/WKDiag14.xmcd"
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} | What would happen to a human body if it was exposed to say 2000°C for just a 1000th of a second?
The body (person would be alive) would be exposed to this temperature only for a 1000th of a second then it would return to normal bodytemperature. Would this short time be enough to destroy DNA, cells etc.? What would happ... | [
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zk1jj | Can you build a pipe or tube that delays light? | I was thinking, what if light enters that tube during the day and is delayed 12 hours and then exits from the other side during the night, to bring its blessing for the night time. Can it be done?
Edit: Preferably, the method must not use energy.
Follow up question: Can you build a circular tube in which light goes a... | askscience | {
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"There is an entire field of study around what you're thinking ... | {
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"url": [
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} | Can you build a pipe or tube that delays light?
I was thinking, what if light enters that tube during the day and is delayed 12 hours and then exits from the other side during the night, to bring its blessing for the night time. Can it be done? Edit: Preferably, the method must not use energy. Follow up question: Can y... | [
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21r485 | Why isn't every month the same length? | If a lunar cycle is a constant length of time, why isn't every month one exact lunar cycle, and not 31 days here, 30 days there, and 28 days sprinkled in?
Edit: Wow, thanks for all the responses! You learn something new every day, I suppose | askscience | {
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"text": [
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"url": [
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"http://archive.spectator.co.uk/article/14th-march-1908/10/a-simplified-calendar"
]
} | Why isn't every month the same length?
If a lunar cycle is a constant length of time, why isn't every month one exact lunar cycle, and not 31 days here, 30 days there, and 28 days sprinkled in? Edit: Wow, thanks for all the responses! You learn something new every day, I suppose | [
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4gof2i | What is the maximum speed of a liquid running through a tube? | askscience | {
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"url": [
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"https://en.wikipedia.org/wiki/Fanno_flow",
"https://en.wikipedia.org/wiki/Rayleigh_flow",
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8dfb9t | Are there any "weird" uses for heavy/transuranic elements? | I recently came across the fact that Americium is used in smoke detectors [(Wikipedia)](_URL_0_). Are there any other interesting applications of other heavy elements? | askscience | {
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"url": []
} | {
"url": [
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]
} | {
"url": [
"https://www.google.com/search?q=uranium+glass&rlz=1C1CHHZ_enUS529US529&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjb2KfvwMfaAhUUyYMKHTITDpMQ_AUICygC&biw=1304&bih=653"
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} | Are there any "weird" uses for heavy/transuranic elements?
I recently came across the fact that Americium is used in smoke detectors [(Wikipedia)](_URL_0_). Are there any other interesting applications of other heavy elements? | [
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1p9qd6 | Question about mass of my airpack from a firefighter. | Hey guys quick question. I was filling my air tank tank late at night after a house fire and a thought struck me. When I put the air tank in the compressor it has approximately 0 psi inside it. We I put 2216 psi in the tanks, I still can't feel a difference between the full one and the empty one. Is there a formula... | askscience | {
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"url": []
} | {
"url": []
} | {
"url": []
} | Question about mass of my airpack from a firefighter.
Hey guys quick question. I was filling my air tank tank late at night after a house fire and a thought struck me. When I put the air tank in the compressor it has approximately 0 psi inside it. We I put 2216 psi in the tanks, I still can't feel a difference between ... | [
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5hj5rn | Why isn't CO2 visible? | I happened across a [absorption spectrum](_URL_0_) of CO2 which included the very end of the visible spectrum. It seems to show CO2 absorbs light in the 630-700 nm wavelength, at least somewhat. I'm curious why, if CO2 seems to absorb some visible light, high concentrations of it are not visible as bluish/cyan gas (w... | askscience | {
"a_id": [
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"text": [
"Hi there! The answer to this question is about the units of the absorbance spectrum you have shown us. The units are in wavenumbers, not nanometers. 600 wavenumbers is approximately 17,000 nm. Hope that clears things up!\n\nSource: aspiring... | {
"url": []
} | {
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"https://www.youtube.com/watch?v=O1fJ3UuSFaU"
]
} | {
"url": []
} | Why isn't CO2 visible?
I happened across a [absorption spectrum](_URL_0_) of CO2 which included the very end of the visible spectrum. It seems to show CO2 absorbs light in the 630-700 nm wavelength, at least somewhat. I'm curious why, if CO2 seems to absorb some visible light, high concentrations of it are not visible ... | [
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a1treo | If an animal within a group (chimps, wolves, etc.) is infertile, are they ostracized by others of their group, or is it not 'noticed' at all? | As the title says! I've been reading up on evolution, and for some reason this question came to my mind. The book (The Human Body) puts a lot of emphasis on how natural selection played a role in making our bodies are they are, obviously through breeding 'advantageous' characteristics, and it made me wonder what happen... | askscience | {
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"In the cases of wolves and chimps, the answer is surely \"no\". Most of the group do not reproduce anyway. Their function is to make the group stronger, while the alpha male and alpha female (in the case wolves) or all the females (in the c... | {
"url": []
} | {
"url": []
} | {
"url": []
} | If an animal within a group (chimps, wolves, etc.) is infertile, are they ostracized by others of their group, or is it not 'noticed' at all?
As the title says! I've been reading up on evolution, and for some reason this question came to my mind. The book (The Human Body) puts a lot of emphasis on how natural selection... | [
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rwgc9 | If an astronaut in the vacuum of space released a bag of flour, would the powder stick onto him/her? | You know...due to gravitational pull, since the human body (and the space suit) would proportionally weight a lot more than a speck of flour. This is also assuming there are no nearby objects with a greater gravitational pull.
Edit: Wow, thanks for the detailed answers.
Edit 2: I was thinking more along the lines o... | askscience | {
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"text": [
"Intermolecular forces like electrostatic attraction and Van der Waals forces would be much much more significant than gravity for these small particles. In fact, the... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://www.youtube.com/watch?v=b-7SmKvFepQ",
"http://www.youtube.com/watch?v=jXYlrw2JQwo&feature=player_detailpage#t=2095s"
]
} | If an astronaut in the vacuum of space released a bag of flour, would the powder stick onto him/her?
You know...due to gravitational pull, since the human body (and the space suit) would proportionally weight a lot more than a speck of flour. This is also assuming there are no nearby objects with a greater gravitationa... | [
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km904 | Traveling to Alpha Centauri, time dilation | If in the near future we generate a technology that allows us to send a space probe to the Alpha Centauri star system at 1/2 the speed of light. Alpha Centauri is 4.5 light years away, logically it would take 9 years to reach it's desination and 4.5 years to beam a signal back to earth.
How does time dilation effect ... | askscience | {
"a_id": [
"c2le8l5",
"c2legh2",
"c2lez8m"
],
"text": [
"> the space probe time should be 9 years relative to itself\n\nThis is incorrect. The probe takes 9 years relative to *us*. It takes less time relative to itself. I can't tell you exactly how much though.",
"You've got it backward. The ... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Lorentz_factor#Values"
]
} | Traveling to Alpha Centauri, time dilation
If in the near future we generate a technology that allows us to send a space probe to the Alpha Centauri star system at 1/2 the speed of light. Alpha Centauri is 4.5 light years away, logically it would take 9 years to reach it's desination and 4.5 years to beam a signal back... | [
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2j9u1e | Are there any significant effects of entanglement observed on a regular basis in nature? | It's been studied and applied in a laboratory setting, but does it produce any observable effects in nature? | askscience | {
"a_id": [
"cl9pxox",
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"text": [
"It's **possible** that photosynthesis involve larger-scale quantum entanglement, but it's still inconclusive and an active area of research.\n\nSee for example here: _URL_1_ (free version here: _URL_2_)\n\n_URL_0_",
"No, ... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Quantum_biology",
"http://www.nature.com/nphys/journal/v6/n6/full/nphys1652.html",
"http://arxiv.org/abs/0905.3787",
"http://en.wikipedia.org/wiki/Exchange_interaction",
"http://hyperphysics.phy-astr.gsu.edu/hbase/molecule/hmol.html",
"http://journals.a... | Are there any significant effects of entanglement observed on a regular basis in nature?
It's been studied and applied in a laboratory setting, but does it produce any observable effects in nature? | [
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5avr7l | Were hands on criticality experiments ever considered safe? | I was reading a Wikipedia article yesterday about the deaths of Harry Daghlian and Louis Slotin, at Los Alamos during the early days of the Manhattan project.
_URL_0_
The experiments they were conducting seem ludicrously unsafe, to the point were accidents were inevitable. The article says that the accident prompted... | askscience | {
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"> Prior to the accidents, was this the standard approach for this type of experiment? \n\nYes, It was more of a manufacturing quality control than a simple 'experime... | {
"url": []
} | {
"url": [
"https://en.m.wikipedia.org/wiki/Demon_core"
]
} | {
"url": [
"https://en.wikipedia.org/wiki/Chicago_Pile-1",
"https://en.wikipedia.org/wiki/Marie_Curie"
]
} | Were hands on criticality experiments ever considered safe?
I was reading a Wikipedia article yesterday about the deaths of Harry Daghlian and Louis Slotin, at Los Alamos during the early days of the Manhattan project. _URL_0_ The experiments they were conducting seem ludicrously unsafe, to the point were accidents wer... | [
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75w3lb | If I have an AC source with a current limiter, what is the minimum voltage required for current to pass through my body (hand to hand) and what current would be fatal? | askscience | {
"a_id": [
"do9gizz",
"do9oxwb",
"do9o7mc"
],
"text": [
"The current to kill varies based on a number of factors, but somewhere around 30mA is enough to cause respiratory failure. On the voltage side, again the situation really varies on several factors but respiratory failure has resulted from a... | {
"url": []
} | {
"url": []
} | {
"url": [
"https://www.cdc.gov/niosh/docs/2009-113/pdfs/2009-113.pdf"
]
} | If I have an AC source with a current limiter, what is the minimum voltage required for current to pass through my body (hand to hand) and what current would be fatal?
| [
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36dlf3 | What allele frequency is changing fastest in the human population? | Just curious as to whether we are able to measure this at a meaningful rate, and if so, which is changing fastest. | askscience | {
"a_id": [
"crd5pk2",
"crd4z9r",
"crd4mrr",
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"crduhyu",
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],
"text": [
"edit: I realize I sort of jumped into the deep end here. If you don't know what \"allele frequency\" means, see [here](_URL_4_) and let me know if you have follow up questions.\n\n... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1000074#pgen-1000074-g003",
"http://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1003372",
"http://www.sciencedirect.com/science/article/pii/S0002929707000407",
"http://www.sciencedirect.com/science/art... | What allele frequency is changing fastest in the human population?
Just curious as to whether we are able to measure this at a meaningful rate, and if so, which is changing fastest. | [
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cetdgb | Can you explain me quantum decoherence in simple language? | askscience | {
"a_id": [
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],
"text": [
"To understand this, it probably helps to start with quantum coherence. At a simplistic level, coherence can be thought of as the information that the quantum system holds. More precisely, it is a measure of the relationship between differen... | {
"url": []
} | {
"url": []
} | {
"url": []
} | Can you explain me quantum decoherence in simple language?
| [
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3cizkr | Why can't spooky action at a distance allow FTL sending of information? | I understand the results are random but can't you at least send a bit of information (the answer to a yes/no question) by saying a spin up particle is yes and spin down is no or something? I think I'm interpreting this wrong. | askscience | {
"a_id": [
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],
"text": [
"Because even though once you make the measurement and know what your partner must get light-years away, there is no way to determine if your partner has done the measurement or not until reach back to them and compare results... | {
"url": []
} | {
"url": []
} | {
"url": []
} | Why can't spooky action at a distance allow FTL sending of information?
I understand the results are random but can't you at least send a bit of information (the answer to a yes/no question) by saying a spin up particle is yes and spin down is no or something? I think I'm interpreting this wrong. | [
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kh9kf | Smallest indivisible unit of time? | Okay, can someone explain Planck Time to me? For those, like me, that don't know a lick [it's absolutely freaky](_URL_0_). Pretty much *time does not exist* below this point. Where does it come from?! Does it just pop out of thin air? I need help! | askscience | {
"a_id": [
"c2k8mb5",
"c2k8m70",
"c2k9dmk"
],
"text": [
"No, it's not a smallest indivisible unit of time. Let's just say it's a time scale where physics, as we know it, doesn't work so well. If space-time is discrete (which isn't a part of any mainstream-accepted theory at the moment) and it's d... | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Planck_time"
]
} | {
"url": [
"http://www.physorg.com/news/2011-06-physics-einstein.html"
]
} | Smallest indivisible unit of time?
Okay, can someone explain Planck Time to me? For those, like me, that don't know a lick [it's absolutely freaky](_URL_0_). Pretty much *time does not exist* below this point. Where does it come from?! Does it just pop out of thin air? I need help! | [
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vivq9 | how did this picture happen? (google maps) | can anyone explain how this image happened (rainbow colored shadow of the plane?)
[link](_URL_0_) | askscience | {
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],
"text": [
"Don't know exactly but some guesses about the possible cause. Obviously it's not the actual shadow of the plane, if you look at the tre... | {
"url": []
} | {
"url": [
"https://maps.google.co.uk/maps?q=47.902279,+14.88553&ie=UTF8&ll=47.902268,14.885863&spn=0.001881,0.004538&hnear=0x477224b39725ed2b:0xaf20cf05591d01c,%2B47°+54'+9.32%22,+%2B14°+53'+5.42%22&gl=uk&t=h&z=18"
]
} | {
"url": [
"http://en.wikipedia.org/wiki/Harris\\_Shutter",
"https://maps.google.co.uk/maps?saddr=Flughafenstr.&daddr=48.1619081,14.3071656+to:Grossprolling+38,+3341,+Austria&hl=en&ll=48.063397,14.518433&spn=0.691084,1.582031&sll=48.082666,14.544525&sspn=0.690825,1.582031&geocode=F... | how did this picture happen? (google maps)
can anyone explain how this image happened (rainbow colored shadow of the plane?) [link](_URL_0_) | [
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