Why does ice stick to metal spoons?

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• Why does ice stick to metal spoons?
• How does the Sun send out EM radiation across the spectrum? Doesn't every frequency require a different process to happen?
• Do how come plane propellers don't torque planes out of balance?
• How does fire spread?
• Why do worms come out of the ground onto the footpath when it's raining?
• With a seemingly MASSIVE amount of historical data on all sorts of inputs, what is still holding us back from extremely accurate weather modeling?
• Dumb question, but if water is a bad conductor of electricity, then why do hair dryers and other bathroom appliances have warnings about not using them in water?
• How exactly are neutrinos and dark matter related?
• Why do rockets fly upwards instead of sideways like a plane lifting off ?
• What makes meth labs so dangerous?
• What could be done to increase the phase velocity of axons?
• Is there any credibility to the Solutrean hypothesis?
• If space shuttles and other spacecraft need heat shields to make it through the friction of atmosphere re-entry, why don't you need special suits when skydiving?
• How do ponds and lakes form?
• What protects astronauts from the acoustic shock of a rocket launch?
• If the sky is blue because it's a short wavelength, but rain bows have violet, why isn't the sky violet?
• Is it possible for there to be a planet whose moon rotates around it perfectly to where you could only see the moon if you were on the other side of the planet?
• Why is it that no matter how much liquid goes into a toilet, the water level always stays the same? (if it's not blocked of course)
• How did plants pollinate on early earth?
• How damaging are submarine lights to deep sea animals' eyes?

Why does ice stick to metal spoons? Posted: 04 Aug 2017 03:28 AM PDT submitted by /u/thelegitnightfuri [link] [comments]

How does the Sun send out EM radiation across the spectrum? Doesn't every frequency require a different process to happen? Posted: 03 Aug 2017 03:52 PM PDT submitted by /u/MarlinMr [link] [comments]

Do how come plane propellers don't torque planes out of balance? Posted: 03 Aug 2017 08:11 PM PDT Helicopters need a tail propeller to counteract the torque that is applied from the blades. But old biplanes are an example of a planes that only have one propeller so shouldn't the plane be off balanced by the torque applied to the propeller only in the opposite direction? submitted by /u/theycallmefuckoff [link] [comments]

How does fire spread? Posted: 03 Aug 2017 03:50 PM PDT Does fire spread, or does the heat from the previous flame match the autoignition temperature and make more flames? submitted by /u/BariumSodiumNa [link] [comments]

Why do worms come out of the ground onto the footpath when it's raining? Posted: 03 Aug 2017 03:12 PM PDT Whenever it rains, the footpaths in my neighbourhood are covered with hundreds of worms. Why do they come out of the dirt to lay on these hard wet surfaces? submitted by /u/Algernon_Asimov [link] [comments]

With a seemingly MASSIVE amount of historical data on all sorts of inputs, what is still holding us back from extremely accurate weather modeling? Posted: 03 Aug 2017 07:05 AM PDT submitted by /u/Toddzilla1337 [link] [comments]

Dumb question, but if water is a bad conductor of electricity, then why do hair dryers and other bathroom appliances have warnings about not using them in water? Posted: 03 Aug 2017 08:15 PM PDT I learned from chemistry class two years ago that water isn't a good conductor of electricity due to its inability to create ions. With that in mind, where is the danger (besides the ones obviously depicted on warnings) in water making contact with bathroom appliances? Do the metal parts and wiring pose a bigger threat, perhaps? (I'll delete this question if it's too rudimentary, but the thought of this popped into my head recently and I don't quite recall my chemistry too well) submitted by /u/K4M1K4ZE [link] [comments]

How exactly are neutrinos and dark matter related? Posted: 03 Aug 2017 06:41 PM PDT submitted by /u/Karmaa [link] [comments]

Why do rockets fly upwards instead of sideways like a plane lifting off ? Posted: 03 Aug 2017 01:47 PM PDT submitted by /u/gregorio02 [link] [comments]

What makes meth labs so dangerous? Posted: 03 Aug 2017 05:16 PM PDT It's widely known that meth labs are practically ticking time bombs, but what actually causes the explosion? submitted by /u/biggestsnake [link] [comments]

What could be done to increase the phase velocity of axons? Posted: 04 Aug 2017 03:13 AM PDT submitted by /u/pimpmastahanhduece [link] [comments]

Is there any credibility to the Solutrean hypothesis? Posted: 03 Aug 2017 11:35 AM PDT A lot of people distort the hypothesis of humans crossing the Atlantic Ocean through an ice bridge from Eurasia into North America with their own, contemporary political or social biases. Putting that aside, is there any credible evidence that shows whether the Solutrean people could have come to North America and become the Clovis people, or has that hypothesis been discredited? submitted by /u/filipinonugget [link] [comments]

If space shuttles and other spacecraft need heat shields to make it through the friction of atmosphere re-entry, why don't you need special suits when skydiving? Posted: 03 Aug 2017 09:14 PM PDT I'm assuming it has to do with the size and speed/terminal velocity of the object, but I'd like more detail submitted by /u/RyanTheTechie [link] [comments]

How do ponds and lakes form? Posted: 03 Aug 2017 04:04 PM PDT I kind of understand how lakes formed in the northern hemisphere by glaciers, but what about other ways they can form, and I just do not know how ponds form in the first place. submitted by /u/Alkazei [link] [comments]

What protects astronauts from the acoustic shock of a rocket launch? Posted: 03 Aug 2017 10:49 AM PDT From what I understand, the safe distance from a rocket launch is usually over a mile away. So what protects the astronauts from the harsh vibrations? submitted by /u/johnnyseal27 [link] [comments]

If the sky is blue because it's a short wavelength, but rain bows have violet, why isn't the sky violet? Posted: 03 Aug 2017 07:05 PM PDT submitted by /u/antiward [link] [comments]

Is it possible for there to be a planet whose moon rotates around it perfectly to where you could only see the moon if you were on the other side of the planet? Posted: 03 Aug 2017 05:51 PM PDT I know that our moon rotates perfectly to where we can only see one side of it but I had never heard of a planet where the moon rotates fast enough to where you would have to trek across the planets surface to the other side in order to actually see it. Is it possible to have a planet/ moon interaction like this? submitted by /u/Login__Failed [link] [comments]

Why is it that no matter how much liquid goes into a toilet, the water level always stays the same? (if it's not blocked of course) Posted: 03 Aug 2017 07:28 AM PDT submitted by /u/MyNameIsSimon88 [link] [comments]

How did plants pollinate on early earth? Posted: 03 Aug 2017 04:15 AM PDT This is kind of a two parter. How did plants pollinate during the dinosaur era of bees weren't around? And earlier than that; how did the first plants on land get pollinated? submitted by /u/Apllejuice [link] [comments]

How damaging are submarine lights to deep sea animals' eyes? Posted: 03 Aug 2017 03:52 PM PDT submitted by /u/sphinctaltickle [link] [comments]

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Why Do Certain Chemicals Cause Different Individuals To Experience Similar Complex Thoughts/Hallucinations? Where Is The Information Coming From?

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• Why Do Certain Chemicals Cause Different Individuals To Experience Similar Complex Thoughts/Hallucinations? Where Is The Information Coming From?
• Does a multi-decade concentration of Radon gas lead to an accumulation of lead particles in an enclosed environment (basement)?
• How do we distinguish an evolutionary trait from a genetic anomaly?
• Are bats leaving a cave able to distinguish their individual "chirps" from one another or does the accumulation of all the "chirps" create a sonic map for all the bats?
• Can we have twin planets like we have twin stars?
• Is there a specific reason why the genus Echinops is so popular with various pollinating insects?
• Whats happening when bread goes stale?
• What would a finite positively curved universe mean for the twin paradox?
• I where do they electrons in circuits come from? Are they in the metal or not bound to anything?
• How have continents survived plate tectonics for this long?
• Why does it take energy to make things colder if this process is removing energy?
• [Biology] Do all nautiluses have the same number of tentacles on their face?
• Why does baking soda expire?
• Why does Pi go on forever?
• How long is the actual process of supernova explosion?
• Do all currently-living things share a single common ancestor?
• How is it that you can compress TBs of data into small easy to move zip files? Shouldn't the data take up the same amount of memory all the time?
• How did Venus acquire its dense atmosphere?
• Why do out of tune instruments that play together create those weird pulses?
• How and why does entropy change during adiabatic magnetisation and subsequent demagnetisation?

Why Do Certain Chemicals Cause Different Individuals To Experience Similar Complex Thoughts/Hallucinations? Where Is The Information Coming From? Posted: 03 Aug 2017 12:20 AM PDT So, I've come across 2 chemicals that regularly cause people to all have similar complex hallucinations. Tetraethyllead - when workers were exposed to hazardous concentrations of the chemical, they contracted lead poisoning, but all reported having a similar hallucinations of "being eaten alive by butterflies". DMT - many uses report seeing "machine elves" when they are hallucinating. My question is: these aren't merely symptoms like stomach pain, or generalized hallucinations like seeing flashing colors, etc. These are complex thoughts. How is it that different people can all experience the same complex thoughts from a simple chemical? Clearly the information isn't being transmitted by the chemical itself... but it's almost more unlikely that the same information is present in everyone's brain waiting for the chemical to trigger it. Such would suggest that everyone has the same "I'm being eaten by butterflies" receptor in their brain, waiting to be activated by TEL. Or is it just that these drugs all affect the brain in some simpler way and everyone just has the same predictable way of making sense of the hallucinogenic effects? But then what's there to differentiate one hallucinogen from another? Why does DMT cause people to hallucinate "machine elves", but other hallucinogens don't? submitted by /u/Suozlx [link] [comments]

Does a multi-decade concentration of Radon gas lead to an accumulation of lead particles in an enclosed environment (basement)? Posted: 03 Aug 2017 06:09 AM PDT I was looking at the decay chain for Radon, and noticed that the first stable element in the chain is lead 210. So if a basement, for example, has high Radon levels for, say 100 years, would that create a higher than normal concentration of lead in that enclosed environment? submitted by /u/kickturkeyoutofnato [link] [comments]

How do we distinguish an evolutionary trait from a genetic anomaly? Posted: 03 Aug 2017 05:41 AM PDT submitted by /u/MeshesMirrors [link] [comments]

Are bats leaving a cave able to distinguish their individual "chirps" from one another or does the accumulation of all the "chirps" create a sonic map for all the bats? Posted: 02 Aug 2017 06:49 PM PDT submitted by /u/Retlaw1995 [link] [comments]

Can we have twin planets like we have twin stars? Posted: 03 Aug 2017 03:34 AM PDT How would they circle eachother and their respective star(s)? submitted by /u/Moshkown [link] [comments]

Is there a specific reason why the genus Echinops is so popular with various pollinating insects? Posted: 03 Aug 2017 12:45 AM PDT The Echinops Genus Picture with, bees, bumblebees, wasp and a fly. submitted by /u/MC_Kloppedie [link] [comments]

Whats happening when bread goes stale? Posted: 03 Aug 2017 04:59 AM PDT submitted by /u/sweaterandsomenikes [link] [comments]

What would a finite positively curved universe mean for the twin paradox? Posted: 02 Aug 2017 05:54 PM PDT So my understanding of the twin paradox is that there are two twins, A and B, A stays on earth and B goes off on a spaceship at 99% the speed of light. From A's perspective, B is travelling at 0.99C, and so clocks on B's spaceship are running slowly, meaning B ages less. But from B's perspective, A is travelling at 0.99C in the opposite direction, meaning B sees these effects happening to A instead. From both reference frames, the other twin is ageing slower, and so the paradox asks: who has aged less when the twins are reunited. The solution to this paradox is that B has to accelerate in order to turn around and come back home. This acceleration means that B is no longer in an inertial reference frame, and so this solves the paradox. BUT. In a positively curved universe, you would not need to turn around and accelerate to come back home. If you travel in one direction for long enough, you would end up back where you started, the same way an ant walking around the surface of a sphere in one direction would end up back where it started. Who would be older and younger when twin B arrives back at earth? submitted by /u/Kelan_ [link] [comments]

I where do they electrons in circuits come from? Are they in the metal or not bound to anything? Posted: 03 Aug 2017 03:07 AM PDT submitted by /u/HeinrichAdolf [link] [comments]

How have continents survived plate tectonics for this long? Posted: 02 Aug 2017 08:59 PM PDT If plate tectonics "recycles" the Earth's crust by subsuming and melting down plates, and then generating new material elsewhere, how the heck have the continents/plates as we know them survived so long? I remember seeing a map of Pangaea breaking up (something like this: pic) and being amazed that basically every recognizable landmass on Earth just basically slides around from one place to another, nothing lost, nothing gained. I dug around a bit on Wikipedia for other supercontinents. The 1.59 billion year old "Columbia" has much, much less recognizable land (pic#/media/File:Paleoglobe_NO_1590_mya-vector-colors.svg)) but still, there are many parts that still exist on Earth. What am I missing here? How do parts like Greenland, West Africa, and Antarctica move north, south, east, and west all over the freaking globe for 1.59 billion years without being recycled? submitted by /u/wankbollox [link] [comments]

Why does it take energy to make things colder if this process is removing energy? Posted: 02 Aug 2017 04:46 PM PDT Theoretically could this energy be harvested rather than just absorbed into a chemical reaction? submitted by /u/pud_ [link] [comments]

[Biology] Do all nautiluses have the same number of tentacles on their face? Posted: 02 Aug 2017 07:45 PM PDT is the number different by age or gender? submitted by /u/sucrerey [link] [comments]

Why does baking soda expire? Posted: 02 Aug 2017 08:22 PM PDT submitted by /u/merpykitty [link] [comments]

Why does Pi go on forever? Posted: 02 Aug 2017 06:51 AM PDT submitted by /u/befriends1234 [link] [comments]

How long is the actual process of supernova explosion? Posted: 02 Aug 2017 09:03 AM PDT So we have the well known Betelgeuse star which is getting close to a supernova stage. My question is, how fast is the actual process? I know that it is probably a bad question since the actual explosion takes only a few moments but I want to know for example how long will it take from the actual explosion (visible from earth) to it expanding over let's say 1 degree in the sky? submitted by /u/RudaBaron [link] [comments]

Do all currently-living things share a single common ancestor? Posted: 02 Aug 2017 09:41 PM PDT I know that generally all life is thought to have a Last Universal Common Ancestor, but was that most likely a single individual? Or is it more likely that early primordial life arose via multiple events, and therefore no matter how far you go back there are currently-living organisms that never shared an ancestor? EDIT: added a word submitted by /u/Trent_A [link] [comments]

How is it that you can compress TBs of data into small easy to move zip files? Shouldn't the data take up the same amount of memory all the time? Posted: 02 Aug 2017 10:45 AM PDT I don't get how you can make data take up less space even though it is the same amount of information. submitted by /u/CustomVox [link] [comments]

How did Venus acquire its dense atmosphere? Posted: 02 Aug 2017 11:18 AM PDT How did Venus' atmosphere get so dense and volatile? submitted by /u/READERmii [link] [comments]

Why do out of tune instruments that play together create those weird pulses? Posted: 02 Aug 2017 01:02 PM PDT submitted by /u/MeMyselfAndI24 [link] [comments]

How and why does entropy change during adiabatic magnetisation and subsequent demagnetisation? Posted: 02 Aug 2017 12:05 PM PDT I am an A-level student trying to do some wider reading and came across the magnetocaloric effect. I was reading this article and got confused in the first paragraph where is is stated: the isothermal compression of a gas (we apply pressure and the entropy decreases) is analogous to the isothermal magnetisation of a paramagnet or a soft ferromagnet (we apply H and the magnetic entropy decreases), while the subsequent adiabatic expansion of a gas (we lower pressure at constant entropy and temperature decreases) is equivalent to adiabatic demagnetisation (we remove H, the total entropy remains constant and temperature decreases since the magnetic entropy increases). I suppose I was mostly wondering why the temperature decreases instead of the total entropy during demagnetisation but was also wondering how to conserve entropy in both the adiabatic expansion of a gas as well as in demagnetisation. Thanks in advance. P.S: Any good recommendations on places to start on becoming familiar with thermodynamics (so I don't have to pester you guys) at a level appropriate to me would be greatly appreciated. submitted by /u/destroyerking492 [link] [comments]

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If insects like the Prey Mantis have thousands of eyes, then why do they have pupils?

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• If insects like the Prey Mantis have thousands of eyes, then why do they have pupils?
• At what level of entropy does a system of a given size collapse into a black hole and how much data could be put on a flash drive before it collapsed into one?
• What is the environmental impact of air conditioning?
• Shouldn't time dilation prevent the creation of a black hole?
• Why is the August 21st eclipse going to move from West to East across the United States?
• Ask Anything Wednesday - Engineering, Mathematics, Computer Science
• Could our solar system ever move into a large area of dust?
• If the whole universe was moving in a given direction at close to c, could we detect it?
• Do black holes and crystals exemplify two extremes of entropy?
• What exactly causes Ketchup to behave as a Non-Newtonian fluid?
• Why don't glow-in-the-dark objects release their stored light energy all at once?
• [Mathematics] (Also physics) Why can one define parallel transport without a metric? Is there a proof that it is a diffeomorphism invariant?
• Why when you feel something in your mouth with your tongue does it feel disproportionately large to how it actually is?
• What are the specific mechanisms of heavy metal ions denaturing or inhibiting enzymes?
• How do biologists estimate the population of endangered species?
• Do diamagnets have applications?
• Do Animals have mental illnesses? Are there sociopath animals?
• It seems that cases of indigestion, GERD/reflux, and heartburn are commonplace compared to being seemingly rare 20+ years ago. Is this true? If so, why?
• How did Bekenstein develop the equation of a black hole's entropy?
• Nucleosynthesis via Tidal Breakup of Neutron Stars?
• What is the relationship between M theory, string theory and supergravity?

If insects like the Prey Mantis have thousands of eyes, then why do they have pupils? Posted: 01 Aug 2017 03:22 PM PDT Is it a big bundle of eyes? And how does it move? In case no one knows what I'm talking about, here's a photo. submitted by /u/Luke-HW [link] [comments]

At what level of entropy does a system of a given size collapse into a black hole and how much data could be put on a flash drive before it collapsed into one? Posted: 02 Aug 2017 05:51 AM PDT I don't exactly understand it, but I recall hearing somewhere that a black hole can be defined as a region in space where entropy has exceeded a certain value. Since entropy is congruent to information, and in light of IBM's new 300TB storage drive, it got me wondering how much data could fit on a flash drive (say 3cc) before it collapsed into a black hole? submitted by /u/ThornOfCamorr1 [link] [comments]

What is the environmental impact of air conditioning? Posted: 02 Aug 2017 08:25 AM PDT My overshoot day question is this - how much impact does air conditioning (in vehicles and buildings) have on energy consumption and production of gas byproducts that impact our climate? I have lived in countries (and decades) with different impacts on global resources, and air conditioning is a common factor for the high consumption conditions. I know there is some impact, and it's probably less than other common aspects of modern society, but would appreciate feedback from those who have more expertise. submitted by /u/skleats [link] [comments]

Shouldn't time dilation prevent the creation of a black hole? Posted: 02 Aug 2017 12:01 AM PDT Because of relativity, the effects of time should almost stop at the event horizon. Doesn't that mean that a black hole takes an infinite amount of time to create? submitted by /u/PM_me_fake_Jewsplz [link] [comments]

Why is the August 21st eclipse going to move from West to East across the United States? Posted: 02 Aug 2017 05:58 AM PDT The earth is rotating relatively rapidly in an East to West direction. Both the Sun and the Moon appear, from our perspective, to rise in the East and set in the West. So, how is this possible? submitted by /u/jlhc55 [link] [comments]

Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 02 Aug 2017 08:07 AM PDT 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]

Could our solar system ever move into a large area of dust? Posted: 01 Aug 2017 10:08 AM PDT If so would it superheat our planet from all the particles burning up in our atmosphere? submitted by /u/Buboxic [link] [comments]

If the whole universe was moving in a given direction at close to c, could we detect it? Posted: 02 Aug 2017 01:34 AM PDT Something like a Great Attractor for different universes, for example. submitted by /u/BinaryHelix [link] [comments]

Do black holes and crystals exemplify two extremes of entropy? Posted: 02 Aug 2017 07:47 AM PDT My base understanding is that entropy is a measure of the possible states of all elements in a system. If this is correct, is a black hole system very entropic and a crystal system very un-entropic? Is there anything more extreme than these? Is quantum foam more entropic than a black hole? Does anything exist which is less entropic than a crystal? So many questions... submitted by /u/fiji1221 [link] [comments]

What exactly causes Ketchup to behave as a Non-Newtonian fluid? Posted: 02 Aug 2017 06:28 AM PDT Is there a specific ingredient or interaction that causes this behavior? submitted by /u/rav-prat-rav [link] [comments]

Why don't glow-in-the-dark objects release their stored light energy all at once? Posted: 01 Aug 2017 11:48 AM PDT I understand that glow-in-the-dark objects/coatings store light energy by excitation of electrons to a higher orbital, and that when the electron drops to it's base orbital it releases the energy in the form of photons. My question is, why don't the electrons all drop simultaneously when the energizing light source goes away, resulting in a single instantaneous pulse of light, and then darkness? submitted by /u/FuriousCoder74 [link] [comments]

[Mathematics] (Also physics) Why can one define parallel transport without a metric? Is there a proof that it is a diffeomorphism invariant? Posted: 01 Aug 2017 02:08 PM PDT Hi! So I've been reading about gauge theories and the problem is, normally physics texts just assume all the geometrical data on the spacetime manifold is available. The setup of a gauge theory is a principal bundle E -> M over the spacetime manifold. On my side, I am studying about Chern-Simons theory, which is a topological field theory known to be diffeomorphism invariant. However, the Chern-Simons action depends on the connection form. I have trouble putting these things together: a connection form uniquely defines a notion of parallel transport. However, parallel transport is very clearly not diffeomorphism invariant. I can deform the curve-to-be-lifted however I want, hell, I can even change the start and ending point via diffeomorphisms. This means that the connection form should not be diffeomorphism invariant. So why on earth does the Chern-Simons action define a topological field theory? :D Thanks! submitted by /u/fuckwatergivemewine [link] [comments]

Why when you feel something in your mouth with your tongue does it feel disproportionately large to how it actually is? Posted: 01 Aug 2017 11:45 AM PDT submitted by /u/mradley [link] [comments]

What are the specific mechanisms of heavy metal ions denaturing or inhibiting enzymes? Posted: 01 Aug 2017 01:59 PM PDT I have heard about other metals replacing ligand bonded ions that "belong" in the enzyme originally, and ions attacking disulphide bridges changing the form of the enzyme, as well as just more generic "ion binds somewhere and changes the shape of the active site". Problem is, I can find a lot of places mentioning these things but not too many sources that actually explain what is happening. Which ones are correct? Are there other possible mechanisms as well? Is the disulphide bond mechanism denaturing or just inhibiting the enzyme? Can any heavy metal ion act as a denaturing agent or an inhibitor? Just trying to understand this submitted by /u/Hodor_The_Great [link] [comments]

How do biologists estimate the population of endangered species? Posted: 01 Aug 2017 06:46 PM PDT Bonus points for explaining how they estimate marine populations, given how large in every dimension our oceans are. (An article I just read quoted a specialist saying there are "roughly 468 Right Whales" remaining. How do you arrive at such a specific number with confidence?) submitted by /u/Nazurai [link] [comments]

Do diamagnets have applications? Posted: 01 Aug 2017 01:09 PM PDT I've heard that superconductors will be used to levitate certain trains like the Hyperloop to reduce friction. Why aren't diamagnets used? submitted by /u/mattbros [link] [comments]

Do Animals have mental illnesses? Are there sociopath animals? Posted: 01 Aug 2017 07:55 PM PDT submitted by /u/Rezzz8080 [link] [comments]

It seems that cases of indigestion, GERD/reflux, and heartburn are commonplace compared to being seemingly rare 20+ years ago. Is this true? If so, why? Posted: 01 Aug 2017 09:55 AM PDT It seems that as a 37 year old, growing up, I rarely heard of GERD and reflux. Nowadays, it seems so common. Why is this the case? submitted by /u/likwidtek [link] [comments]

How did Bekenstein develop the equation of a black hole's entropy? Posted: 01 Aug 2017 09:55 AM PDT I've gotten as far as working out the Planck area from dropping single photons into a black hole, but I have no clue how to get from there to entropy. I know entropy is practically without units, but there are many ways I could mess with the formula to create something without units, and it would likely be meaningless. How did Jacob Bekenstein know which way to arrange the formula to describe entropy? submitted by /u/DarkFireRogue [link] [comments]

Nucleosynthesis via Tidal Breakup of Neutron Stars? Posted: 01 Aug 2017 09:51 AM PDT I know that neutron stars contain a lot of nucleons below the surface that aren't bound to a specific nucleus. I also know that a neutron star will break up if it passes too close to a black hole. In such a situation, pieces of the neutron star might be ejected. What would the isotopic composition of the resulting debris look like? Would we see isotopes that are usually too neutron-rich to form? A literature search turned up this conclusion from 1976. "At present it is unclear [what] distribution of heavy elements result, although it seems safe to conclude that neutron-rich heavy elements themselves do result" - Lattimer & Schramm, Astrophysical Journal, vol. 210, page 562 submitted by /u/Bucky8s [link] [comments]

What is the relationship between M theory, string theory and supergravity? Posted: 01 Aug 2017 10:18 AM PDT Ok so it was a few years ago and i watched a really interesting documentary about M theory. In it was discussed how string theory and supergravity theory were at odds for a long time with one of the main distinctions being how many dimensions of time and space there were. IIRC they said string theory had for a long time used 10 dimensions wereas supergravity used 11. Then when they used string theory and added to their equations the 11th dimension proposed by supergravity it made a new and much more "elegant" theory wherein instead of strings it became a membrane. Hence the name m theory. When i search tho i cant find this documentary and searching m theory just brings up string theory which i (likely incorrectly) thought had replaced string theory as the prevailing modus operandi in quantum mechanics. Am i wholly incorrect in this thought? If so what is the real relation btwn the 3? Thank you so much in advance and if any one has some recent documentary suggestions on this it would be greatly appreciated. submitted by /u/chaz_almasy [link] [comments]

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