AskScience AMA Series: I’m David Johns, a doctoral student at Columbia University’s Mailman School of Public Health. I study the scientific arguments around the controversial question of how much salt we should be eating in order to stay healthy. Ask Me Anything!

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• AskScience AMA Series: I’m David Johns, a doctoral student at Columbia University’s Mailman School of Public Health. I study the scientific arguments around the controversial question of how much salt we should be eating in order to stay healthy. Ask Me Anything!
• Why is the black hole information paradox a paradox at all? Isn't "information" an entirely man-made concept with no reflection in reality? It's not a physical law or a description of any physical process.
• How big is the chance that 3 random people in a room share the same birthday, with those 3 people being the only one in the room? I just experienced this at work
• Does cloud cover affect the power output of solar panels?
• Why are most of the Ice age relatives of modern animals so large?
• GPS satellites work because they adjust for similar bending of spacetime to coordinate with systems on Earth. Why wouldn't they?
• How do backyard animals, like birds and squirrels, tolerate each other to a point of ignoring each other's presence?
• I've heard that we can't see the atom and will never be able to. Is that true? If so, why?
• We know many species of animals are now extinct. Are there any extinct plants in the world? How did they reach extinction?
• If the vacuum of space is a poor conductor of heat, how do stars give off so much of it?
• If I were in a helicopter during a very large earthquake, would I be able to see the seismic waves moving across the ground?
• How do birds survive when they migrate back to their home and its still snowing?
• Are animals affected by fluctuations in living altitude in a similar way to humans?
• How can super spicy peppers stop living organisms from growing?
• At what moment does a tree "decides" to grow a new branch ?
• Do cross-eyed people see the world in double and learn to operate that way? Or does their brain learn to process the image correctly?
• As space expands in the standard model, are planck lengths expanding or being created, or, are planck lengths an arbitrary grid based upon and imagined over the smallest amount of spacetime as it itself expands?
• How do fish and other marine life sense temperature? [Biology]
• If reduced pressure lowers the boiling point of water, does increased pressure raise the freezing point?
• As an irrational number, what makes pi different from all the other irrational numbers?

AskScience AMA Series: I’m David Johns, a doctoral student at Columbia University’s Mailman School of Public Health. I study the scientific arguments around the controversial question of how much salt we should be eating in order to stay healthy. Ask Me Anything! Posted: 04 Mar 2016 04:47 AM PST Hi Reddit! With my collaborators Ludovic Trinquart and Sandro Galea, I conducted an analysis of scientific reports and comments on the health effects of a salty diet. Our findings, published in the International Journal of Epidemiology, reveal a sharp polarization between a group of scientists who support the hypothesis that population-wide reduction of salt intake will lead to improved health and those who believe the data are not convincing. In all, 54 percent of the reports were supportive of the hypothesis; 33 percent were not supportive; and 13 percent found the evidence inconclusive. A citation analysis found that papers on either "side" of the debate were more likely to cite other reports that drew a similar conclusion. Even as the scientific debate over salt continues, public health officials have enacted policies to lower consumption. World Health Organization guidelines recommend limiting salt intake. In December 2015, New York became the first U.S. city to require chain restaurants to label foods high in sodium. I will be back to answer your questions at 1 pm EST (10 am PST, 6 pm UTC) Ask Me Anything! submitted by /u/MailmanSchool_AMA [link] [comments]

Why is the black hole information paradox a paradox at all? Isn't "information" an entirely man-made concept with no reflection in reality? It's not a physical law or a description of any physical process. Posted: 03 Mar 2016 09:51 PM PST submitted by /u/lecherous_hump [link] [comments]

How big is the chance that 3 random people in a room share the same birthday, with those 3 people being the only one in the room? I just experienced this at work Posted: 04 Mar 2016 04:29 AM PST I'm trying to figure it out myself and all i can think of is 1/365 * 1/365 * 1/365 = 1/48627125. But that cant be right? Considering the birthday paradox i'm guessing the chances are probably much higher submitted by /u/meiuqer [link] [comments]

Does cloud cover affect the power output of solar panels? Posted: 03 Mar 2016 04:20 PM PST If cloud block the sun light, would electrical output fall to 0? would it stay the same because the UV radiation still goes through the clouds? submitted by /u/Spillls [link] [comments]

Why are most of the Ice age relatives of modern animals so large? Posted: 03 Mar 2016 01:28 PM PST Animals grow large because the environment allows for it. I assume this means that food was plentiful during the ice age, yet the ice age seems an unlikely time for food to be more plentiful. Wouldn't the size of prehistoric animals be telling us that there was more food available than now since they were all much larger, requiring much more food? submitted by /u/grease_thetrueword [link] [comments]

GPS satellites work because they adjust for similar bending of spacetime to coordinate with systems on Earth. Why wouldn't they? Posted: 03 Mar 2016 02:45 PM PST What possible errors could they make without this adjustment? I thought all they do is to point us direction or pinpoint our location. Why are they really concerned about time? submitted by /u/oxycash [link] [comments]

How do backyard animals, like birds and squirrels, tolerate each other to a point of ignoring each other's presence? Posted: 03 Mar 2016 10:26 AM PST submitted by /u/jim45804 [link] [comments]

I've heard that we can't see the atom and will never be able to. Is that true? If so, why? Posted: 03 Mar 2016 10:14 PM PST The exact phrase was "it's not about technology, we just can't see the atom directly and will never be able to, despite all the technology that is available to us now and will be available in the future". submitted by /u/Rainforest_ [link] [comments]

We know many species of animals are now extinct. Are there any extinct plants in the world? How did they reach extinction? Posted: 03 Mar 2016 11:24 AM PST submitted by /u/AristocratesSR [link] [comments]

If the vacuum of space is a poor conductor of heat, how do stars give off so much of it? Posted: 03 Mar 2016 01:23 PM PST Mostly interested on if this principle could be used in spacecraft to get rid of excess heat? submitted by /u/Psyladine [link] [comments]

If I were in a helicopter during a very large earthquake, would I be able to see the seismic waves moving across the ground? Posted: 03 Mar 2016 09:56 AM PST I don't think I would be able to, but I was thinking about it. Second, how large would it have to be in order to see the ground move from a normal helicopter flight? submitted by /u/fusearms [link] [comments]

How do birds survive when they migrate back to their home and its still snowing? Posted: 03 Mar 2016 02:00 PM PST I mean of course they have less food options in the cold, but can their little fatless bodies handle the cold? I almost feel bad watching some of them struggle with the cold wind. :( And if food shortage is really an issue couldn't humans just start leaving bird feed out during the winters? submitted by /u/Mouthz [link] [comments]

Are animals affected by fluctuations in living altitude in a similar way to humans? Posted: 03 Mar 2016 09:23 AM PST I'm guessing that there are some animals that are specially adapted to living at high altitudes that could handle transitions fairly well, but what about those that aren't? For example, would a cat or dog that was born at sea level and then brought to somewhere like Denver or Mexico City experience shortness of breath or other symptoms of altitude sickness? Would they acclimate to the altitude, and if so, more or less quickly than humans? Would they also be vulnerable to edemas at even higher elevations? And what about the reverse? Would a non-specially adapted animal from a higher altitude show greater physical fitness at lower altitudes than one that had lived lower its entire life? submitted by /u/resurrection_man [link] [comments]

How can super spicy peppers stop living organisms from growing? Posted: 03 Mar 2016 09:20 AM PST https://youtu.be/tUbo25IrgZ8 at 4:45 its said that scorpion peppers are so hot that if they are infused with paint, and it stops things from growing on the bottom of ships. Can someone go into a little more detail about this? Can any anamial actually use or live near where these peppers grow? Why are peppers made so hot? For defense, so the plant can live on, and how does being muy caliente actually stop life from growing. submitted by /u/nocturnal111 [link] [comments]

At what moment does a tree "decides" to grow a new branch ? Posted: 03 Mar 2016 09:57 AM PST When animals and humans grow, they follow a certain path, which is planned by their genome. But trees seems to be completely random. What mechanism "decide" to grow a new branch? submitted by /u/jubalharsh [link] [comments]

Do cross-eyed people see the world in double and learn to operate that way? Or does their brain learn to process the image correctly? Posted: 03 Mar 2016 08:37 AM PST I assume it's the latter because I doubt anyone's eyes are 100% straight/aligned, but in that case - when a baby is born cross-eyed, do they already know how to correctly interpret images, or do their neurons have to learn? submitted by /u/wingwingwehavadinner [link] [comments]

As space expands in the standard model, are planck lengths expanding or being created, or, are planck lengths an arbitrary grid based upon and imagined over the smallest amount of spacetime as it itself expands? Posted: 04 Mar 2016 12:50 AM PST submitted by /u/roesingape [link] [comments]

How do fish and other marine life sense temperature? [Biology] Posted: 03 Mar 2016 11:16 AM PST submitted by /u/SqoishMaloish [link] [comments]

If reduced pressure lowers the boiling point of water, does increased pressure raise the freezing point? Posted: 03 Mar 2016 08:45 AM PST submitted by /u/Cheeseychunks [link] [comments]

As an irrational number, what makes pi different from all the other irrational numbers? Posted: 03 Mar 2016 09:00 PM PST People often say that irrationality is a special quality of pi so I was wondering why it's special. submitted by /u/KimJongFunnest [link] [comments]

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How did this article, suggesting Intelligent Design of the hand, make it through peer-review and into PLOS One?

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• How did this article, suggesting Intelligent Design of the hand, make it through peer-review and into PLOS One?
• If I had a rope on earth and someone was at the sun with the other side of the rope then one person tugged on one side, would the other instantly feel it?
• Is it possible for a person to 'overpower' a mental disorder like Schizophrenia or the Capgras delusion?
• How is an actual memory different from a memory of an imagination or fantasy?
• In 2014 Harvard infamously claimed to have discovered gravitational waves. It was false. Recently LIGO famously claimed to have discovered gravitational waves. Should we be skeptical this time around?
• Is there a marine equivalent to a ruminant mammal?
• If benzodiazepines enhance the effect of GABA on your brain, why wouldn't GABA supplements do the same?
• If I could exert a large force on the entirety of the earth, what direction would cause the earth to fall into the Sun first?
• What type of radiation does Iodine-125 emit? I don't understand the wikipedia article about it (source in comments)
• What would happen if someone with OCD was physically prevented from carrying out their compulsions?
• Appalachian and Penokean mountain-building?
• Why don't electrons "stick" to protons in the nucleus of an atom?
• What effects has gaining weight on the balance of a person? More exactly, do the shoulders fall back in order to compensate the weight of the belly?
• What would happen if the black hole at the centre of a galaxy disappeared?
• Does the mass of a supermassive black hole determine the shape of the galaxy it is at the center of?
• How long was a day on Earth 300 million years ago?
• Is there a rate and depth at which bodies of water freeze that can be calculated based on temperature and duration?
• In information theory, if I = log 1/p, then an impossible or extremely unlikely event would have infinite information, can this explain the origin of the universe?
• How do the operators of the LHC (and other particle accelerators), get the protons they use?
• Is there any correlation between the shape of a 3d object and it's ability to conserve energy?

How did this article, suggesting Intelligent Design of the hand, make it through peer-review and into PLOS One? Posted: 02 Mar 2016 03:16 PM PST http://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0146193 Also note the comment section: "Even if I should not be able to convince the authors, editors and peer reviewers of this study of the non-existence of a divine intelligent Creator, please consider: Humans occasionally use their hand as a tool of masturbation, one of "a multitude of daily tasks" performed "in a comfortable way". Masturbation is a sinful activity according to most religions, including Christianity, Islam, Judaism, Hinduism and apparently even Buddhism. Thus, the hand cannot have been designed by a divine Creator, but in fact possibly by the Devil himself, to lead the humanity (and other apes) into temptation." submitted by /u/crispsix [link] [comments]

If I had a rope on earth and someone was at the sun with the other side of the rope then one person tugged on one side, would the other instantly feel it? Posted: 02 Mar 2016 07:02 PM PST submitted by /u/NoMoreYankieMyWankie [link] [comments]

Is it possible for a person to 'overpower' a mental disorder like Schizophrenia or the Capgras delusion? Posted: 02 Mar 2016 05:06 PM PST submitted by /u/Zhared [link] [comments]

How is an actual memory different from a memory of an imagination or fantasy? Posted: 02 Mar 2016 05:50 PM PST For example, if a person is given a lie detector test and instead of focusing on his actual memory the person focuses on an alternate imaginative version of that memory. Will this person's body still react as though he is telling the truth or will it react like he is lying? submitted by /u/theshantanu [link] [comments]

In 2014 Harvard infamously claimed to have discovered gravitational waves. It was false. Recently LIGO famously claimed to have discovered gravitational waves. Should we be skeptical this time around? Posted: 03 Mar 2016 05:29 AM PST Harvard claimed to have detected gravitational waves in 2014. It was huge news. They did not have any doubts what-so-ever of their discovery: "According to the Harvard group there was a one in 2 million chance of the result being a statistical fluke." 1 in 2 million! Those claims turned out completely false. https://www.theguardian.com/science/2014/jun/04/gravitational-wave-discovery-dust-big-bang-inflation Pretty appalling unscientific approach to this whole ordeal by Harvard. Recently, gravitational waves discovery has been announced again. This time not by Harvard but a joint venture spearheaded by MIT. So, basically, with Harvard so falsely sure of their claim of their gravitational wave discovery, what makes LIGO's claims so much more trustworthy? submitted by /u/Ballongo [link] [comments]

Is there a marine equivalent to a ruminant mammal? Posted: 02 Mar 2016 07:13 AM PST I understand that fish have gut fauna to help in digestion, but do any fish or inverts feed on primarily plant matter that have cellulose? submitted by /u/oh_hey_swan [link] [comments]

If benzodiazepines enhance the effect of GABA on your brain, why wouldn't GABA supplements do the same? Posted: 02 Mar 2016 07:58 PM PST submitted by /u/benz0banshee [link] [comments]

If I could exert a large force on the entirety of the earth, what direction would cause the earth to fall into the Sun first? Posted: 03 Mar 2016 06:23 AM PST This is ignoring the fact that the Sun is expanding, obviously. My ideas were a force pushing the earth directly towards the sun and a force directly against the direction of its orbit, slowing it. submitted by /u/Meazles [link] [comments]

What type of radiation does Iodine-125 emit? I don't understand the wikipedia article about it (source in comments) Posted: 02 Mar 2016 03:21 PM PST https://en.wikipedia.org/wiki/Iodine-125 what type of radiation is that? gamma? submitted by /u/krazykman1 [link] [comments]

What would happen if someone with OCD was physically prevented from carrying out their compulsions? Posted: 02 Mar 2016 03:13 PM PST Of course, such an experiment would be extremely unethical and not something that should be done, but admittedly I am curious about what the results would be. Would the person realise that no harm has come to them after not carrying out the compulsion? submitted by /u/KetchupWithEverythin [link] [comments]

Appalachian and Penokean mountain-building? Posted: 02 Mar 2016 06:53 PM PST My current understanding of the creation of the Appalachian mountains is that Gondwanaland collied with what is now North America because the ocean that was there at the time closed. This joining created the Appalachians around 270Ma. My question is: were the Penokean Mountains created in a similar way, 1.8Ga? As in, did the Atlantic ocean (or whatever was the paleo-equivalent ocean) close up at an even earlier time, creating the Penokean mountains? Or was it something else? submitted by /u/stevorange [link] [comments]

Why don't electrons "stick" to protons in the nucleus of an atom? Posted: 02 Mar 2016 08:19 PM PST Shouldn't electrons' negative charges and protons' positive charges attract each other, like oppositely charged magnets? Instead, we're given an image of electrons orbiting a nucleus in a surrounding "cloud," which seems weird, since opposite charges attract (like ionic compounds composed of anions and cations). [Answered -- Don't know how to put that flair, sorry. Thanks everyone!] submitted by /u/Mijamahmad [link] [comments]

What effects has gaining weight on the balance of a person? More exactly, do the shoulders fall back in order to compensate the weight of the belly? Posted: 02 Mar 2016 03:04 PM PST submitted by /u/george_i [link] [comments]

What would happen if the black hole at the centre of a galaxy disappeared? Posted: 03 Mar 2016 03:57 AM PST Would the spot where the black hole used to be still act like the barycenter of the galaxy and everything would just keep orbiting that? Or would something else happen? submitted by /u/ApuFromTechSupport [link] [comments]

Does the mass of a supermassive black hole determine the shape of the galaxy it is at the center of? Posted: 02 Mar 2016 11:17 AM PST submitted by /u/BryndenOfHouseStark [link] [comments]

How long was a day on Earth 300 million years ago? Posted: 02 Mar 2016 08:48 AM PST submitted by /u/djdylex [link] [comments]

Is there a rate and depth at which bodies of water freeze that can be calculated based on temperature and duration? Posted: 02 Mar 2016 01:30 PM PST For example, "a deep freshwater lake will freeze at one millimeter per hour for every degree below zero" or "saltwater will freeze to a depth of two meters after XX days of -20 degree weather." submitted by /u/53045248437532743874 [link] [comments]

In information theory, if I = log 1/p, then an impossible or extremely unlikely event would have infinite information, can this explain the origin of the universe? Posted: 02 Mar 2016 06:38 PM PST As per the title, I understand that in information theory, Information (I) = log 1/p, where p is probability. Would that mean that an impossible or extremely unlikely event would have infinite information? If so, can we move from infinite information to an explanation of the creation of the universe? Take the event "Something happening to nothing", that would have an extremely low if not impossible probability, over infinite time though would that not result in infinite information? submitted by /u/mootmeep [link] [comments]

How do the operators of the LHC (and other particle accelerators), get the protons they use? Posted: 02 Mar 2016 02:22 PM PST More specifically how do they get the protons into the mechanism itself? submitted by /u/Starzajo [link] [comments]

Is there any correlation between the shape of a 3d object and it's ability to conserve energy? Posted: 02 Mar 2016 05:03 AM PST I'm interested to know if there is a correlation betwen the shape of the "object" and its heat conserving capacity, given the same surface area, material composition and external factors. ex: Does a sphere lose energy faster than a cube? submitted by /u/ampren7a [link] [comments]

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Does a spinning magnet in space eventually stop spinning?

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• Does a spinning magnet in space eventually stop spinning?
• There have been a few news articles written in the past 24 hours regarding a sudden increase in carbon monoxide on the west coast, but I can't find any reputable sources. Is this accurate, and if so, does it lend credence to a potential Earthquake?
• Why does striking of two metals generate event in electromagnetic field?
• Why C squared?
• I always hear about gravity in terms of planets and objects creating "depressions" in the fabric of space, but space is three-dimensional... why doesn't the explanation of gravity seem to take this into account?
• What foods allowed civilizations to grow so well in the "Old World" before being introduced to food from the "New World" that now seem like staples (corn, potatoes, tomatoes, etc)?
• What would a photon sphere look like?
• What's the curvature of the universe?
• How do Multiple-use injection pens work? What stops them from leaking? How are they possibly air/water tight?
• Could Amazon, using its entire delivery network, deliver an entire mountain to my door in 48 hours or less?
• How does radiation therapy work on a microscopic level?
• Is there a possible scenario where two events, A and B, can occur as: A then B, A and B simultaneously, and B then A, all using three different relativistic frames?
• If a flow of Electrons is an electric current, then what is a flow of protons called and what does it do?
• If I was floating in space and didn't have a point of reference, would I be able to tell if my body inverted 180 degrees from my original position?
• Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology
• Why does my bathroom window cause the light from the street light outside to form this pattern?
• [Physics] Do substances have aliasing at an atomic level?
• AskScience AMA Series: Kumar Sanjiv, Cancer Researcher
• If space has a lower temperature than Earth, would it be possible to 'import' the cooler temperatures to battle rising temperatures on Earth? What are the pitfalls and complications of this?
• Aerobic respiration in bacteria? How does it work if there isn't neither any mitochondria nor any structure related to it in the prokaryotic cell?
• How come crystals like Diamond don't conduct electricity?
• Have oil spills ever occurred naturally? If so, what was their size and impact compared to man-made oil spills today?
• In relations to animal behavior, what is structural and consequential behavior?

Does a spinning magnet in space eventually stop spinning? Posted: 01 Mar 2016 12:44 PM PST If a object is placed in space and spun, it will continue to spin forever according to Newton's first law. If the spinning object is a magnet, it will produce a radio wave. My understanding is that this radio wave would radiate energy and therefore slow down the spin of the magnet. submitted by /u/Rstager97 [link] [comments]

There have been a few news articles written in the past 24 hours regarding a sudden increase in carbon monoxide on the west coast, but I can't find any reputable sources. Is this accurate, and if so, does it lend credence to a potential Earthquake? Posted: 01 Mar 2016 09:03 AM PST These articles seem alarmist in nature (especially as they label it a "carbon monoxide explosion"), but the logic seems sound. Example article submitted by /u/koulnis [link] [comments]

Why does striking of two metals generate event in electromagnetic field? Posted: 02 Mar 2016 04:32 AM PST I have designed a device for listening to electromagnetic fields. The other day I have noticed that I can hear my keys ringing in my pocket with it, even though the event isn't "electric" or "magnetic" in my basic understanding. Then I tried different metallic objects, and indeed I could hear them ringing in the electromagnetic field. What is the exact reason for this? Thanks. submitted by /u/mrkwa [link] [comments]

Why C squared? Posted: 01 Mar 2016 11:50 PM PST Hello. In the equation E=MC2, I get that it's saying energy = mass, and the speed of light squared is how to convert between the two... So it could also be written as: E divided by C squared = mass. Firstly, I'm confused about what the measurement is here.. what is the common measurement comparing mass and energy? And the question that I'm the most interested about... Why is it C squared? Thanks submitted by /u/Dantholemew [link] [comments]

I always hear about gravity in terms of planets and objects creating "depressions" in the fabric of space, but space is three-dimensional... why doesn't the explanation of gravity seem to take this into account? Posted: 01 Mar 2016 03:19 PM PST It seems like there has to be a more accurate way of visualizing what this looks like in 3D. Gravity waves here Depressing Fabric o' space here submitted by /u/Casey_is_drunk [link] [comments]

What foods allowed civilizations to grow so well in the "Old World" before being introduced to food from the "New World" that now seem like staples (corn, potatoes, tomatoes, etc)? Posted: 01 Mar 2016 07:22 PM PST It seems that many, if not the majority, of fruits and vegetables we commonly eat around the world today came from the Americas. What foods allowed civilization flourish in the Old World? submitted by /u/ArchaicArchosaur [link] [comments]

What would a photon sphere look like? Posted: 01 Mar 2016 01:49 PM PST https://en.wikipedia.org/wiki/Neutron_star As we all know, photons can become trapped in orbits around neutron stars or black holes creating a photon sphere. (duh!) The above linked wiki states in the Properties section that a photon sphere would render the entire surface of a neutron star visible. My question being; is this accurate, and if so, what would that visually look like? My friend claims it would be a highly distorted image, to the point of being incomprehensible, since the photons you could see would be the one-off ones escaping orbit and reaching your eye. Would there be some kind of coherent image, albeit very distorted? submitted by /u/plumsmugler [link] [comments]

What's the curvature of the universe? Posted: 01 Mar 2016 11:16 AM PST More precisely, what are the bounds? I've found something saying that it's 1.00 ± 0.02, but that doesn't have any units so obviously it's a form I'm unfamiliar with and it's completely unhelpful. What is it in inverse lightyears? submitted by /u/DCarrier [link] [comments]

How do Multiple-use injection pens work? What stops them from leaking? How are they possibly air/water tight? Posted: 01 Mar 2016 06:53 PM PST I am not asking about the drugs they use, or any medical use of them. I saw someone use a multi-dose pen and the mechanics of it all just blew me away. I am fascinated by how they actually work, and how they perform what seems like a high-tolerance task repeatably, affordably, and in a sanitary manner. submitted by /u/Nairatrebil [link] [comments]

Could Amazon, using its entire delivery network, deliver an entire mountain to my door in 48 hours or less? Posted: 01 Mar 2016 10:00 PM PST This topic came up earlier during an episode of wild Amazon Prime shopping. Amazon has a HUGE shipping and delivery network, but could they deliver a mountain the size of, say, Nevada's Mt. Charleston by Saturday afternoon? It should be noted that everyone at work is now invested in this answer. Most of the people I work with think it's possible, but I've got my doubts, so I figured this would be there place to ask. submitted by /u/TheGreatZarquon [link] [comments]

How does radiation therapy work on a microscopic level? Posted: 01 Mar 2016 07:29 PM PST How do we use radioisotopes to help us with killing off tumours on an atomic level? Also what are the radioisotopes used? submitted by /u/nitaicech [link] [comments]

Is there a possible scenario where two events, A and B, can occur as: A then B, A and B simultaneously, and B then A, all using three different relativistic frames? Posted: 01 Mar 2016 07:11 AM PST It's been a while since I've caught up with GR. Say two events occur: A and B. Is it possible to have a frame R experience A then B, a frame R' experience A and B simultaneously, and a frame R'' experience B then A, all within our universe of physics? I am unsure if this would imply that it is simply three frames with three different accelerations, or if one frame would require time to be moving in the negative direction. EDIT: Thank you for the well put responses. submitted by /u/ThePharros [link] [comments]

If a flow of Electrons is an electric current, then what is a flow of protons called and what does it do? Posted: 01 Mar 2016 01:26 PM PST submitted by /u/LionKiegrass70 [link] [comments]

If I was floating in space and didn't have a point of reference, would I be able to tell if my body inverted 180 degrees from my original position? Posted: 01 Mar 2016 01:59 PM PST submitted by /u/LazyOrCollege [link] [comments]

Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology Posted: 02 Mar 2016 07:02 AM PST 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 or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! submitted by /u/AutoModerator [link] [comments]

Why does my bathroom window cause the light from the street light outside to form this pattern? Posted: 02 Mar 2016 02:40 AM PST The pattern also seems to change in ways that don't make sense to my eyes, moving a small amount forward or backward causes it to expand and contract a lot. Here are the pictures. submitted by /u/MooseinPursuit [link] [comments]

[Physics] Do substances have aliasing at an atomic level? Posted: 02 Mar 2016 06:20 AM PST It seems to me that they would, except for the fact that atoms aren't tied to a grid like pixels. Has this ever been looked at by anyone? submitted by /u/mackuhronee [link] [comments]

AskScience AMA Series: Kumar Sanjiv, Cancer Researcher Posted: 02 Mar 2016 06:08 AM PST Hello, My name is Kumar sanjiv, I am working at Helleday Laboratory, karolinska Institute. We are developing new cancer therapies by targeting DNA repair proteins. Before coming in to research, I worked 3 year as veterinary doctor. In my spare time I like to play with my kid and to watch movies. My favorite Bollywood movies are 3 Idiots and Barfi. I grew up in northern India and completed my most of education in India before moving to Taipei, Taiwan to PhD in Molecular medicine. During my childhood I was influenced by my maternal grandfather, who was a physicist. Proof: http://i.imgur.com/uNB5Kby.jpg submitted by /u/HelledayLab [link] [comments]

If space has a lower temperature than Earth, would it be possible to 'import' the cooler temperatures to battle rising temperatures on Earth? What are the pitfalls and complications of this? Posted: 02 Mar 2016 05:53 AM PST submitted by /u/howsdcraic [link] [comments]

Aerobic respiration in bacteria? How does it work if there isn't neither any mitochondria nor any structure related to it in the prokaryotic cell? Posted: 02 Mar 2016 05:51 AM PST Or is there a structure? I've read that we used to believe mesosome would be related to aerobic respiration, nowadays many believe that structure doesn't exist... so... I am confused... I would appreciate some help. (Sorry if I have commited any mistakes along the text, English is not my main language) submitted by /u/Nahbd [link] [comments]

How come crystals like Diamond don't conduct electricity? Posted: 01 Mar 2016 06:57 PM PST If a current works by the flow of charge down an atomic lattice why not in crystals which have a symmetrical structure? submitted by /u/GetBenttt [link] [comments]

Have oil spills ever occurred naturally? If so, what was their size and impact compared to man-made oil spills today? Posted: 01 Mar 2016 06:16 AM PST submitted by /u/boetzie [link] [comments]

In relations to animal behavior, what is structural and consequential behavior? Posted: 01 Mar 2016 03:40 PM PST For a project I'm doing, I have to identify seven listed behaviors as either of those, or give a relational description of behavior. submitted by /u/JITTERdUdE [link] [comments]

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