Why are some viral infections permanent, but some are cleared up within a few days? What determines how long it takes the body to clear the infection?

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• Why are some viral infections permanent, but some are cleared up within a few days? What determines how long it takes the body to clear the infection?
• When a gas gets compressed the temperature increases. According to Google the temperature of a black hole is near absolute zero. If a gas gets compresed enough that it becomes a black hole, in wich step does it loose that temperature?
• Does “wind chill” have any effect on ice formation or retention? In other words, if the actual temperature is 33F, but the wind chill is 18, will ice last longer than a temp of 33 with a “real feel” of 36?
• When did physicists realize that nothing can move faster than light and that the speed of light is immutable regardless of the inertial frame?
• Does a concentration gradient only refer to a single unique substance?
• How does alcohol work as a muscle relaxant? Are there any other substances that have the same effect?
• The solar system is one of many in the Milky Way, which is one of 54 galaxies in our local group. That local group is part of an even bigger structure. Is there a limit to how large these structures can be, or will we keep discovering larger and larger ones?
• How are antimicrobial agents tested? For example, if scientists wanted to test the antimicrobial properties of Lysol, how would it be tested?
• When sick, what causes fever?
• How long does the collapsing phase of a supernova last?
• Is it probable that the solar panels from the Mars rover get cleaned by a storm or anything else?
• Has the Earth expanded over the last 3 billion years and is it still?
• I know about the Rutherford-Geiger–Marsden experiment, shooting particles through gold foil, etc., but how did they know how many particles they fired?
• Do all species of mammals produce identical twins?
• Given that mass x gravity = weight, if I were in a 0 gravity environment and I lifted an otherwise heavy car, would I need an extraordinary strength or not?
• How much DNA do scandinavians share with the germanic tribes who migrated there, compared to the earliest populations?
• How did Blackett and Runcorn determine that Earth's magnetic poles had drifted or flipped?
• Why does liquid metal that solidifed quickly has a high strength?
• Could we use the color of a planets aurora to determine the sustainably of human life?
• Is it possible to express a musical sound's timbre quantitatively?

Why are some viral infections permanent, but some are cleared up within a few days? What determines how long it takes the body to clear the infection? Posted: 14 Feb 2019 06:30 PM PST submitted by /u/fusionevaporation [link] [comments]

When a gas gets compressed the temperature increases. According to Google the temperature of a black hole is near absolute zero. If a gas gets compresed enough that it becomes a black hole, in wich step does it loose that temperature? Posted: 15 Feb 2019 03:01 AM PST submitted by /u/FedeFranzosi [link] [comments]

Does “wind chill” have any effect on ice formation or retention? In other words, if the actual temperature is 33F, but the wind chill is 18, will ice last longer than a temp of 33 with a “real feel” of 36? Posted: 15 Feb 2019 04:54 AM PST In other words, is wind chill just something to help make weather reports more sensational, or is there any actual physical effect? submitted by /u/ericdavis1240214 [link] [comments]

When did physicists realize that nothing can move faster than light and that the speed of light is immutable regardless of the inertial frame? Posted: 15 Feb 2019 05:25 AM PST After watching this video on Sixty Symbols, I understand that mathematically by applying the Lorentz Transformation to calculate the speed of the photons coming out of a torch from a passenger on a passing train for an observer's frame of reference outside the train, one obtains c as the result for both observers. However it's not clear to me if this is a consequence of Einstein's special relativity, or if the immutability of the speed of light had been previously established. I wildly guess then, without knowing much about the Maxwell Equations that it was those which established the speed of light as constant and the maximum achievable in the universe, but I wonder how and would be thankful if someone could point me to where I can find more information about this. ​ Thank you! submitted by /u/Javihache [link] [comments]

Does a concentration gradient only refer to a single unique substance? Posted: 15 Feb 2019 08:05 AM PST Let's say I have a membrane with 1 mol/L Mg2+ on one side and the same concentration of Ca2+ on the other; Does this count as a single concentration gradient 1:1 or as two 1:0 and 0:1 ? If the second possibility is correct my follow up question would be: What is the property that governs what each substance is? Is it charge? Size of the nucleus? How does the universe know this? Thank you! submitted by /u/MrSebu [link] [comments]

How does alcohol work as a muscle relaxant? Are there any other substances that have the same effect? Posted: 15 Feb 2019 06:26 AM PST I was wondering how alcohol affects the body and if there was some way to achieve the same relaxing effect on the muscles as alcohol without impairing cognitive function, like coordination or judgement. submitted by /u/Puckosar [link] [comments]

The solar system is one of many in the Milky Way, which is one of 54 galaxies in our local group. That local group is part of an even bigger structure. Is there a limit to how large these structures can be, or will we keep discovering larger and larger ones? Posted: 14 Feb 2019 09:32 PM PST submitted by /u/Ajreil [link] [comments]

How are antimicrobial agents tested? For example, if scientists wanted to test the antimicrobial properties of Lysol, how would it be tested? Posted: 14 Feb 2019 11:15 PM PST I'm talking about household disinfectants, something that would be used in a household setting for perhaps disinfecting the bathroom or kitchen counter, not testing antibiotics against an extremely specific type of microbe. Would the testing be done so that the product being tested is directly applied to a surface, allowed to take effect, then swabbed for microbes and then placed into a Petri dish, then placed into an incubator, and then observe for microbes on the agar? Or would they swab the surface first, grow some colonies of the bacteria/whatever else is on there, then drop a small, sterile disc of filter paper soaked in the antimicrobial solution and then placed back into the incubator and then observe how much of the growths in the Petri dish have been killed off? What is there are large colonies of microbes growing? That's not exactly a real-life representation of a common household surface in need of some disinfecting. Any links to a detailed procedure lab? All feedback is appreciated! ​ (edit: spelling) submitted by /u/WhatEvenIsPalmer [link] [comments]

When sick, what causes fever? Posted: 15 Feb 2019 07:55 AM PST submitted by /u/Hamderber [link] [comments]

How long does the collapsing phase of a supernova last? Posted: 14 Feb 2019 09:03 PM PST Supernova's occur when a large dying star collapses on itself and then explodes. Given the cosmic scales involved I'm sure this collapse is not instantaneous, how long is all the matter in a dying star collapsing before it explodes? submitted by /u/InfiniteTrain [link] [comments]

Is it probable that the solar panels from the Mars rover get cleaned by a storm or anything else? Posted: 14 Feb 2019 05:09 PM PST submitted by /u/Shakko_ [link] [comments]

Has the Earth expanded over the last 3 billion years and is it still? Posted: 15 Feb 2019 05:31 AM PST submitted by /u/mtrash [link] [comments]

I know about the Rutherford-Geiger–Marsden experiment, shooting particles through gold foil, etc., but how did they know how many particles they fired? Posted: 14 Feb 2019 04:46 PM PST submitted by /u/not_trevor [link] [comments]

Do all species of mammals produce identical twins? Posted: 14 Feb 2019 11:01 PM PST submitted by /u/SadRide4 [link] [comments]

Given that mass x gravity = weight, if I were in a 0 gravity environment and I lifted an otherwise heavy car, would I need an extraordinary strength or not? Posted: 15 Feb 2019 04:16 AM PST The question came up in the comments of a certain anime and I am confused by some people assuring that you need strength to lift it anyway. As far as I know, you shouldn't need it. submitted by /u/MacaCabral99 [link] [comments]

How much DNA do scandinavians share with the germanic tribes who migrated there, compared to the earliest populations? Posted: 15 Feb 2019 03:20 AM PST Samis not included submitted by /u/rogne [link] [comments]

How did Blackett and Runcorn determine that Earth's magnetic poles had drifted or flipped? Posted: 15 Feb 2019 01:20 AM PST I'm reading "A Short History of Nearly Everything". In it, Bill Bryson tells how Patrick Blackett and S. K. Runcorn determined by the use of tiny grains of iron in ancient rocks, where the poles had been during the creation of said rocks. I told my father this neat fact and he said: "How do they know the rocks weren't just flipped instead of the poles?". How did they? I know how magnetic tape works and thought it could be similar to the alignment of the particles embedded in the tape that represent the waveforms, but as I am no geologist, could not answer his question. submitted by /u/morsmordre- [link] [comments]

Why does liquid metal that solidifed quickly has a high strength? Posted: 15 Feb 2019 01:07 AM PST submitted by /u/engkulimali [link] [comments]

Could we use the color of a planets aurora to determine the sustainably of human life? Posted: 14 Feb 2019 09:07 PM PST submitted by /u/tyler27722 [link] [comments]

Is it possible to express a musical sound's timbre quantitatively? Posted: 15 Feb 2019 12:51 AM PST I know there are a thousand things that could affect tone, and you would probably be quite limited if you were to express it in a single number but, I think it would be super interesting to be able to experiment with different aspects of an instrument and be able to measure their effect on tone. Even if you couldn't express the whole tone as a single number (which I don't really expect is possible), are there any major aspects of tone that could be expressed as a number? submitted by /u/ALackOfIntelligence [link] [comments]

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Why is it not E=1/2m c^2, like KE=1/2m v^2 ? Did Einstein leave off the 1/2?

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• Why is it not E=1/2m c^2, like KE=1/2m v^2 ? Did Einstein leave off the 1/2?
• What is the time uncertainty in the energy time uncertainty principle? How can we derive this from position and momentum uncertainty? How to calculate it since we do not have an operator for time?
• If an electron in an atom emits a photon but no lower energy orbital is available for it to drop to, does the electron leave the atom?
• Why are there no magnetic monopoles in existence but “monopolar” electric charges (protons electrons) exist?
• What is a water surface like at a molecular level?
• What is the medium between synapses? And what force if there is any, pushing neurotransmitters into receptors?
• What will happen to Earth when the Milky Way collides with the Andromeda galaxy?
• How come NASA's Opportunity rover lasted as long as it did?
• How exactly does a shock wave from an explosion kills you (assuming that you don't die due to heat and objects flying around)?
• How is actual temperature and “feels like” temperature determined on a weather app?
• What do the final days before Launch involve for Astronauts?
• If a reactor used weapons-grade material (plutonium, uranium, etc.), would an ensuing meltdown look like a nuclear bomb?
• What made the Chernobyl NPP design so flawed - and were there other nuclear power plants with similar design in the Soviet Union? Are there any in the world now?
• Why does PH affect bacteria life so differently in the gut versus the mouth?
• Why do people store their pH probes in distilled water?
• Does reading / close viewing actually affect or harm vision?
• How do single celled creatures heal their wounds if at all?
• Why does the spin imparted on a bullet by rifling continue once it has left the barrel?
• The North American Great Lakes are connected to the Northern Atlantic Ocean through the St Lawrence River, so why isn't the salinity level of the lakes higher?
• What happens when lightning strikes the ocean? Will the fish in the area be affected in any way?
• Can exposure to radiation ignite a flammable gas?
• Does NASA know exactly what went wrong with Opportunity? Why exactly she gave out?
• Why does the far side of the moon have less crater marks than the side facing earth? Wouldn’t earth’s gravity prevent that?

Why is it not E=1/2m c^2, like KE=1/2m v^2 ? Did Einstein leave off the 1/2? Posted: 13 Feb 2019 07:58 PM PST submitted by /u/dmaswhite4 [link] [comments]

What is the time uncertainty in the energy time uncertainty principle? How can we derive this from position and momentum uncertainty? How to calculate it since we do not have an operator for time? Posted: 14 Feb 2019 05:01 AM PST submitted by /u/lousylad10 [link] [comments]

If an electron in an atom emits a photon but no lower energy orbital is available for it to drop to, does the electron leave the atom? Posted: 14 Feb 2019 08:06 AM PST I understand that if an electron absorbs a photon it can be excited to a higher orbital and the only way to drop back down is to emit a photon. My question asks if an electron is already at its lowest possible orbital and emits a photon, does the electron simply get knocked from the atom? ​ Also would an electron that is in a higher orbital emit a photon naturally without any outside excitation in order to drop down and fill the lower orbitals? Or can photons only be emitted by outside excitation? submitted by /u/ryandeanrocks [link] [comments]

Why are there no magnetic monopoles in existence but “monopolar” electric charges (protons electrons) exist? Posted: 13 Feb 2019 08:48 PM PST submitted by /u/cr_7405 [link] [comments]

What is a water surface like at a molecular level? Posted: 13 Feb 2019 10:02 PM PST Suppose that you have a glass container which is half-full of pure water at room temperature, sitting on a table, and there are no external sources of vibration (aside from thermal motion) from the table or surrounding air. Suppose that you could zoom in on the surface of the water almost to a molecular level and make measurements to judge the appearance of the water surface. I would like to understand as much as possible what this would be like and if and how it might be different from how we think of a water surface at larger scales. Would there be a sharply-defined water surface (at a molecular level) or a more-or-less gradual transition from liquid to gas? Would there be waves in the water and how big would they be? What role would surface tension play in the size of waves and the escape of water molecules into the gas phase? Would the appearance of the surface be dominated by the passage of molecules to and from the gas phase, or would these events not have such a great surface density? Thanks in advance for any help in clarifying this. submitted by /u/clearing [link] [comments]

What is the medium between synapses? And what force if there is any, pushing neurotransmitters into receptors? Posted: 14 Feb 2019 06:41 AM PST submitted by /u/LilxDDDD [link] [comments]

What will happen to Earth when the Milky Way collides with the Andromeda galaxy? Posted: 14 Feb 2019 03:52 AM PST So in 4 billion years the Milky Way is going to collide with the Andromeda Galexy, but if for some reason that were to happen in our lifetime, how might it affect our planet/ solar system? submitted by /u/fenster112 [link] [comments]

How come NASA's Opportunity rover lasted as long as it did? Posted: 14 Feb 2019 04:23 AM PST How come it went from an expected duration of 90 days to staying alive for 14 years? What did they expect would 'kill' the rover so soon? Why didn't this happen? In 14 years, what more has the rover accomplished other than it's initial goals for those 90 days? submitted by /u/Sietseee [link] [comments]

How exactly does a shock wave from an explosion kills you (assuming that you don't die due to heat and objects flying around)? Posted: 13 Feb 2019 03:50 PM PST submitted by /u/bullschitero [link] [comments]

How is actual temperature and “feels like” temperature determined on a weather app? Posted: 13 Feb 2019 11:32 PM PST On my weather app it says "feels like 56 degrees" but the actual temperature is 58 degrees. Is a formula used? submitted by /u/PROMODZoCOM [link] [comments]

What do the final days before Launch involve for Astronauts? Posted: 14 Feb 2019 03:17 AM PST I've always maintained a semi-constant fascination for space-exploration. I always say I was born at the wrong time. As an average guy of average intelligence and average health, I can't explore space today. You need to be so exceptional in so many ways. Where's my personal space ship that can zip me across the galaxy at 45,000c??? But one can always dream. ​ I did read one of Chris Hadfield's books, and I learned a lot about astronaut training, the different considerations physiologically, mechanically etc. as well as the stuff that happens during launch and once you're up there. One thing I never really got a sense of though, is what happens during those final 24-48h? What preparations do the astronauts go through? Vaccinations, final check-ups, routines, etc. ​ Essentially, I'm asking, what and why is done to/by astronauts up to the point where they're strapped in? I'm still looking online but I'm not really sure where to begin. I'm on ESA's and NASA's websites at the moment. Youtube has been surprisingly disappointing. submitted by /u/MerryfaceAviation [link] [comments]

If a reactor used weapons-grade material (plutonium, uranium, etc.), would an ensuing meltdown look like a nuclear bomb? Posted: 14 Feb 2019 08:25 AM PST Also, what do you tag for nuclear stuff like this? submitted by /u/superservo27 [link] [comments]

What made the Chernobyl NPP design so flawed - and were there other nuclear power plants with similar design in the Soviet Union? Are there any in the world now? Posted: 14 Feb 2019 08:15 AM PST I was wondering if there are any other power plants built in a similar flawed fashion or at the very least if there used to be many of them and what happened since the disaster. Couldn't find the answer from a quick google. submitted by /u/SvarogsSon [link] [comments]

Why does PH affect bacteria life so differently in the gut versus the mouth? Posted: 14 Feb 2019 08:08 AM PST Google "gut health, PH and bacteria" and the articles tell you that: " Healthy gut microbes tolerate an ecosystem with a low pH (acid) while harmful bacteria do not" Google "oral health, PH and bacteria" and with some reading you will find that many articles will say something like: " An acidic environment allows bad bacteria to thrive and contributes to plaque accumulation,demineralization of the teeth, bad breath, gingivitis, and periodontal disease; while a more alkaline environment favors good bacteria and is essential for optima articles tell you that the bad bacteria can't survive in an alkaline environment." So which is it? Why do bad gut bacteria like alkalinity and good gut bacteria like acidity, while bad mouth bacteria like acidity and good mouth bacteria like akalinity? ​ submitted by /u/k2900 [link] [comments]

Why do people store their pH probes in distilled water? Posted: 14 Feb 2019 08:02 AM PST I have read that distilled water will strip the ions from the probe essentially causing them to be less effective over time yet every place I've ever worked has always kept the pH probes in distilled water when not in use. Wouldn't it be better to store it in a solution with more ions rather than less? submitted by /u/Ohjay1982 [link] [comments]

Does reading / close viewing actually affect or harm vision? Posted: 14 Feb 2019 08:02 AM PST I was listening to a podcast about a doctor who treated myopia and he asserted that focusing on objects close to the face put strain on the eye and could damage the muscles that adjust the lens because from an evolutionary perspective our hunter/gatherer ancestors would be adapted for primarily long-distance vision to see prey or look for danger, and short-range vision would only be used intermittently rather than for hours at a time reading books or some such. it was also asserted that glasses prevented natural focusing of the eye and would, over time, make the eye weaker and inevitably lead to stronger prescriptions due to further atrophy of the eye muscles. This all seems to make sense to me but I'm not a doctor. Is this largely nonsense or is there any real scientific support for this? submitted by /u/stupidrobots [link] [comments]

How do single celled creatures heal their wounds if at all? Posted: 14 Feb 2019 07:58 AM PST Multicelled creatures pretty much just replace the dead/damaged cells with new cells but what do the individual cells do to repair damage to their individual cell walls? Is it active or passive meaning do the molecules just link back together because of their physical qualities (polarity between water molecules and such) or do cells/Eukaryotes/prokaryotes/Archaebacteria have ways of actively repairing themselves? submitted by /u/JohnWoke [link] [comments]

Why does the spin imparted on a bullet by rifling continue once it has left the barrel? Posted: 14 Feb 2019 07:55 AM PST Why doesnt it just remain at its last point of rotation when it exited? submitted by /u/eggsngravy [link] [comments]

The North American Great Lakes are connected to the Northern Atlantic Ocean through the St Lawrence River, so why isn't the salinity level of the lakes higher? Posted: 14 Feb 2019 06:58 AM PST Are there salinity differences between say, Lake Ontario and Lake Superior? What processes effect the boundary between fresh and salt water? submitted by /u/Olleck [link] [comments]

What happens when lightning strikes the ocean? Will the fish in the area be affected in any way? Posted: 14 Feb 2019 03:08 AM PST submitted by /u/bunman89 [link] [comments]

Can exposure to radiation ignite a flammable gas? Posted: 14 Feb 2019 06:21 AM PST submitted by /u/PumSqu [link] [comments]

Does NASA know exactly what went wrong with Opportunity? Why exactly she gave out? Posted: 13 Feb 2019 06:46 PM PST submitted by /u/Pterodactylandi [link] [comments]

Why does the far side of the moon have less crater marks than the side facing earth? Wouldn’t earth’s gravity prevent that? Posted: 13 Feb 2019 04:18 PM PST submitted by /u/Phosamedo [link] [comments]

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Are deep water currents affected by the coriolis effect?

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• Are deep water currents affected by the coriolis effect?
• Does a magnet ever lose its power?
• How does a buried seed know where "up" is?
• Why does the onset of schizophrenia occur later in women than men?
• Do we have a way to measure size other than relative to other objects? In other words, if everything in the universe was growing at the same rate, down to the subatomic level, would we know?
• Is saving fuel the only reason we use Hohmann transfers (for instance to go to Mars)?
• Does the atomspheric pressure increase when more co2 is produced?
• There are many dedicated hardware to solve cyptographic hashing functions because of crypocurrency mining. Does this weaken the security of the used functions in other applications?
• Do gases heat up when they contract? If so, theoretically, in a vacuum, would repeated equal contractions and expansions result in a net heat loss or not?
• Since red blood cells contain no nucleus how is dna obtained from blood?
• Ask Anything Wednesday - Engineering, Mathematics, Computer Science
• How long would someone need to spend in another country, before it would be detectable to isotope analysis?
• How does this chemical equilibrium expression work?
• What came first, fermions or bosons?
• Does sunlight lose energy as it travels?
• Can the same vaccine be used on any species?
• Why do American favorite colors include red less often than the rest of the world?
• Is is possible for fox fur to change color with age?
• I read a TIL about a woman who can smell Parkinson's and animals that can sniff out cancer. Has there ever been any significant push to investigate the human "odorome" wrt health and disease? If not, how would we go about it?
• Okay, so how on earth did New Zealand form?
• How does vegetation get to desert oases?
• What is the Derivation of the Autoignition Equation?
• How are soil maps of a large area like the United States able to be so clearly defined?

Are deep water currents affected by the coriolis effect? Posted: 12 Feb 2019 03:38 PM PST Hello. I was wondering if deep water currents are affected by the coriolis effect. I have read about Ekman transport and how the coriolis effect plays a role in surface currents, but I was wondering if a similar process could occur in deep water currents? When I look at a map of the ocean currents, all I see for deep water currents is a relatively straight path from the Northern hemisphere to the Southern hemisphere, and then around Antarctica and up into the Pacific. I know they are density-driven, but shouldn't they deflect a little due to the coriolis effect as they move? Thanks! submitted by /u/EmpireOfBarbettia [link] [comments]

Does a magnet ever lose its power? Posted: 13 Feb 2019 03:48 AM PST submitted by /u/PM_NUDES_AND_FEET [link] [comments]

How does a buried seed know where "up" is? Posted: 12 Feb 2019 10:09 PM PST submitted by /u/MotionField [link] [comments]

Why does the onset of schizophrenia occur later in women than men? Posted: 12 Feb 2019 10:08 AM PST According to these studies: Sex Differences in the Adolescent Brain; Women and Schizophrenia , the female brain finishes maturing on average four years earlier than males (21 in women and 25 in men). However, the onset of schizophrenia occurs later in women (late 20s+ in women and 18-24 in men). The first study referenced mentions a hypothesis that the pubertal surge in estrogen women experience may delay the symptoms, but the researchers seemed hesitant to attribute that as a definite cause. I have not been able to find an answer as to why schizophrenia typically begins later in women, especially since the observed development patterns between the sexes would intuit the opposite. Does anyone know the answer to this? submitted by /u/writetolive2 [link] [comments]

Do we have a way to measure size other than relative to other objects? In other words, if everything in the universe was growing at the same rate, down to the subatomic level, would we know? Posted: 13 Feb 2019 01:55 AM PST submitted by /u/trclocke [link] [comments]

Is saving fuel the only reason we use Hohmann transfers (for instance to go to Mars)? Posted: 13 Feb 2019 06:16 AM PST I realize that Hohmann transfers are the most efficient way of transferring between two elliptical orbits in the same plane, but are there other reasons why we choose that particular way? It seems that the need to wait for proper launch windows could become a problem sometime down the line. Could there be other reasonable trajectories, for instance, the craft decelerating and slingshotting around the Sun and then accelerating into a farther orbit? What would be the downsides of such flight-paths? Edit: Was corrected; Hohmann transfers aren't the most efficient but are amongst the most favourable. submitted by /u/Gabercek [link] [comments]

Does the atomspheric pressure increase when more co2 is produced? Posted: 12 Feb 2019 03:29 PM PST submitted by /u/biscuwit [link] [comments]

There are many dedicated hardware to solve cyptographic hashing functions because of crypocurrency mining. Does this weaken the security of the used functions in other applications? Posted: 13 Feb 2019 07:02 AM PST There are many ASICs, FPGAs, GPUs available to brute force SHA256 (for mining Bitcoins). This means that cracking SHA256 is cheaper than other algorithms. submitted by /u/Da_Drueben [link] [comments]

Do gases heat up when they contract? If so, theoretically, in a vacuum, would repeated equal contractions and expansions result in a net heat loss or not? Posted: 13 Feb 2019 07:48 AM PST submitted by /u/feesih0ps [link] [comments]

Since red blood cells contain no nucleus how is dna obtained from blood? Posted: 12 Feb 2019 01:45 PM PST submitted by /u/Olidude44 [link] [comments]

Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 13 Feb 2019 07:12 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer Science 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]

How long would someone need to spend in another country, before it would be detectable to isotope analysis? Posted: 13 Feb 2019 12:25 AM PST So, I was reading Sue Black(formerly Professor of Forensic Anthropology at University of Dundee, Scotland)'s book "All That Remains" the other day and there was a passage that caught my attention. It was talking about the use of isotope analysis on people's hair to determine whether someone had spent time in another country (the specific example used was "a terrorist suspect claiming to have never left the UK" having spent time in Afghanistan), and it had me wondering about just how much time you'd need to spend in another country (or another part of your own, for that matter) to affect such an analysis? submitted by /u/PhasersToShakeNBake [link] [comments]

How does this chemical equilibrium expression work? Posted: 12 Feb 2019 11:05 PM PST I came across an equation that looked something like this: HgO(s) = Hg(l) + O2(g). Now the equilibrium expression should be K = [O2], since HgO and Hg are solid and liquid respectively, so they shouldn't be considered in the equilibrium expression. According to this expression, reducing the concentration/pressure of O2 should reduce K, and in turn, shift the equilibrium to the reactants. However, according to Le Chatelier's Principle, reducing the pressure would shift the equilibrium to the right, as there are more moles of gas there. ​ How do Le Chatelier's Principle and the equilibrium expression relate/affect one another, and are they always accurate? submitted by /u/Protolate [link] [comments]

What came first, fermions or bosons? Posted: 13 Feb 2019 01:42 AM PST submitted by /u/pimpmastahanhduece [link] [comments]

Does sunlight lose energy as it travels? Posted: 12 Feb 2019 08:50 PM PST Why does the sun heat heat a planet like mercury more than a planet like Neptune? If space is a vacuum, where does the energy go that is lost between the sun and a planet? submitted by /u/Shard5 [link] [comments]

Can the same vaccine be used on any species? Posted: 12 Feb 2019 08:09 PM PST Assuming that, for example, a cat and a human could be infected with the same illness, could an identical vaccine be used grant immunity to both species? What factors would cause a vaccine to be ineffective between species? submitted by /u/Majumafoo [link] [comments]

Why do American favorite colors include red less often than the rest of the world? Posted: 13 Feb 2019 07:11 AM PST Some Google searches tell me that average American favorite colors are blue, purple, green, THEN red, while the rest of the world's average favorite colors are blue, then red, then whatever else. So, what makes red less appealing to us? I don't know if other countries associate it with anger and intensity like we do. I also considered the Red Scare, but that's getting far enough back that it shouldn't affect the younger generations so much. So why? submitted by /u/HowDoISea [link] [comments]

Is is possible for fox fur to change color with age? Posted: 13 Feb 2019 07:09 AM PST I'm asking this because I'm a Zootopia fan and I noticed that there was one fox character who was shown as an eight-year-old to have a white-tipped tail, but when we later see that character in his twenties, he has a brown-tipped tail. A goof? Probably. But I'm curious if that sort of thing happens in real life. submitted by /u/Dancou-Maryuu [link] [comments]

I read a TIL about a woman who can smell Parkinson's and animals that can sniff out cancer. Has there ever been any significant push to investigate the human "odorome" wrt health and disease? If not, how would we go about it? Posted: 13 Feb 2019 07:06 AM PST Speculating here, but it seems like monitoring the changes in the odorome might be a cheap and useful diagnostic tool. The TIL in the title. submitted by /u/ghostoftheuniverse [link] [comments]

Okay, so how on earth did New Zealand form? Posted: 12 Feb 2019 04:00 PM PST I'm looking at the information available to me, and New Zealand forming, as I understand it, involves it breaking off of Australia and sinking into the ocean. This confounds me for several reasons. ​ 1: I see no rift valley. It's my understanding that when continents break apart, you get a rift valley, which forms into an ocean. Now, I see no oceanic ridge between New Zealand and Australia that may have formerly been a rift valley. ​ 2: How is New Zealand not on its own plate? It's made of continental crust, and separate from New Zealand through a process I can only assume involved rifting. Wouldn't this result in it being on its own plate? Instead, this mass of continental crust is somehow over a convergent boundary where two bits of oceanic crust meat. How does this work? This doesn't make sense to me. ​ 3: It's on a convergent boundary, but the sunken continent isn't outlined by subduction zones? If two bits of oceanic crust are ramming together around New Zeland, which is made of continental crust, why isn't the crust subducting under all of Newzealand? ​ Now, I'm assuming I'm missing some major information here, or there are some mechanics here that I just don't understand or know about, because this whole situation pokes so many holes in my understanding of plate tectonics and how continental crust moves, that it boggles me and makes me question if I know anything at all. Someone, please explain this mess to me. submitted by /u/jaxlov [link] [comments]

How does vegetation get to desert oases? Posted: 13 Feb 2019 06:23 AM PST https://www.reddit.com/r/pics/comments/aq289z/this_is_what_an_oasis_in_libya_looks_like/ Saw this in r/pics. The desert must be millennia in age, has the vegetation just reproduced and survived from before the desert was there? Or is there a different way vegetation that lush is there? Some commentors say the water must be salty, so I'm just lost how all this can be there. submitted by /u/cornhole99 [link] [comments]

What is the Derivation of the Autoignition Equation? Posted: 13 Feb 2019 02:31 AM PST The time for a material to reach its autoignition temperature is defined as : tig= (pi/4)*kpc[(Tig-T0)/q"]^2 where k = thermal conductivity, ρ = density, and c = specific heat capacity of the material of interest, T0 is the initial temperature of the material (or the temperature of the bulk material). The heat flux is q", the autoigntion temperature is Tig, and the time it takes to reach that is tig. I tried to search the derivation of this equation online but could not find any. What is the derivation of the autoignition temperature? And is there even a derivation for this? submitted by /u/lyadalachanc [link] [comments]

How are soil maps of a large area like the United States able to be so clearly defined? Posted: 13 Feb 2019 05:47 AM PST submitted by /u/Rebel_Scum83 [link] [comments]

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