Why do so many medicines require you to stop eating grapefruit?

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• Why do so many medicines require you to stop eating grapefruit?
• Is a single atom able to cast a shadow?
• [neuroscience]Is there any limit as to how much information that the human brain can hold?
• Why is NASA's James Webb telescope built out of hexagonal panels for its mirror? Why is the mirror not a curved surface, and why were hexagons chosen over triangles or octagons etc.? Why does the Hubble telescope (seem to) not require this geometry?
• Why is there a blip in lift at the stall angle in this CFD calculation?
• How do virtual photons have a real influence?
• Has an underground nuclear power plant ever been attempted, and would having a nuclear plant under ground mitigate the problems from a meltdown?
• Can a linear accelerator be re-configured and used as a 'decelerator'?
• Can neutrons be created by bombarding protons with electrons of high enough energy?
• Do different types of radiation have different effects?
• Do astronauts in space have to push harder, in order to have a bowel movement?
• If someone is walking down the road, is the air around them moving to avoid the person, or are they more like a knife cutting through the air?
• Could a binary star system have a planet tidally locked to the baricenter?
• What kills you when you burn to death?
• If humans have only been around for about 100,000 years, then why did it take 95,000 years for us to do anything rememberable? Did our brains become more evolved in the last few thousand years?
• Why does being electrocuted (high voltage) cause a person to die?
• Can anyone give an intuitive explanation of gauge theory?
• [Physics] Can you fuse elementary particles and their antiparticles together, and what happens if you do?
• Is there an intuitive way of understanding the contraction mapping theorem?
• How stable would elements in the island of stability be?
• Could someone explain these equations?

Why do so many medicines require you to stop eating grapefruit? Posted: 16 May 2017 02:03 PM PDT submitted by /u/coffeecreamersucks [link] [comments]

Is a single atom able to cast a shadow? Posted: 17 May 2017 03:24 AM PDT submitted by /u/Tolosuka [link] [comments]

[neuroscience]Is there any limit as to how much information that the human brain can hold? Posted: 16 May 2017 06:58 PM PDT Is there any theoretical limit as to how much information that the human brain can hold? What would happen if someone reached that limit? submitted by /u/Der_Ist [link] [comments]

Why is NASA's James Webb telescope built out of hexagonal panels for its mirror? Why is the mirror not a curved surface, and why were hexagons chosen over triangles or octagons etc.? Why does the Hubble telescope (seem to) not require this geometry? Posted: 16 May 2017 10:02 PM PDT submitted by /u/MareSerenitatis [link] [comments]

Why is there a blip in lift at the stall angle in this CFD calculation? Posted: 17 May 2017 03:55 AM PDT As you can see from this image, there is a blip in lift around the stall angle for the wing we ran through a CFD program. We tested around 17-20 degrees multiple times and still saw that the lift went down, then up, then dropped off again as it stalled. Is there a reason for the lift dropping off, then spiking again? Is it because of something to do with the flow detaching at a certain angle, then managing to reattach before detaching again? Is it just an expected error when running this sort of simulation through a computer program, or did we simply not test a wide enough range around the stall angle to get enough data to show a relatively steady drop off? Lots of questions, I'm just puzzled as to why this happened. Any help would be greatly appreciated! EDIT: My comment on a x-post: Yeah, vortices being generated on the leading edge would be my guess as it's the only seemingly possible way for the flow to reattach after detaching at a slightly lower AoA, which would explain the lift spike. The only comparable example I can come up with is the Vortex Lift effect on delta wings, which causes an increase in lift at high AoA due to vortices forming on the leading edge. However, this happens because the leading edge is sharp, so I didn't think this was possible for a ~NACA 0021 profile. For delta wings: "In general, this vortex flow results in an increase in lift associated with the upper-surface pressures induced by the vortex and an increase in drag resulting from the loss of leading-edge suction." The effect is how delta wings maintain low speeds / high AoA as the vortices increase the stall angle. No way of testing it, but it's a NACA 0021 profile so I thought that this effect would be well documented if it existed on the profile. The only reason I can think it might not be documented is if this effect only happens at certain airspeeds and I happened to pick one that it does happen at. It may just be an error with the CFD calculations, or it's just such a small effect that it's not credited elsewhere. submitted by /u/Geotherm_alt [link] [comments]

How do virtual photons have a real influence? Posted: 17 May 2017 06:00 AM PDT My question is, if virtual photons are a mathematical book keeping tool, how do they play a real role in terms of Hawking radiation and vacuum energy? Thanks! submitted by /u/spk96 [link] [comments]

Has an underground nuclear power plant ever been attempted, and would having a nuclear plant under ground mitigate the problems from a meltdown? Posted: 16 May 2017 02:36 PM PDT submitted by /u/BugMan717 [link] [comments]

Can a linear accelerator be re-configured and used as a 'decelerator'? Posted: 16 May 2017 06:23 PM PDT Let's say one had a beam of charged particles moving at some speed, could they be slowed using a linear accelerator that is reconfigured to decelerate the particles? If it's simpler to think about this with defined 'packets' of charged particles, or particles that penetrate the 'decelerator' one at a time, then so be it. submitted by /u/dbcollins [link] [comments]

Can neutrons be created by bombarding protons with electrons of high enough energy? Posted: 16 May 2017 10:19 PM PDT I'm aware that electron capture is this process, but it only occurs in nuclei where there is a lower energy decay state. What I haven't been able to find information on is if it's possible to fire an electron at a proton and convert the pair into an electron neutrino and neutron via the weak interaction, provided that the electron comes in with enough kinetic energy to account for the extra neutron mass. Since a similar process can take place with neutrinos transforming protons in nuclei via inverse beta decay, can electrons do something similar to bare protons (Hydrogen)? submitted by /u/USI-9080 [link] [comments]

Do different types of radiation have different effects? Posted: 16 May 2017 04:56 PM PDT I work in a nuclear power plant and we hear a lot about radiation doses and everything we do to keep it as low as reasonably achievable (ALARA). During our training that everyone goes through we learn about different types of radiation: alpha, beta, gamma, and neutron. The focus is primarily on their penetrating power. Alpha is stopped by paper or skin, beta is blocked by plastic or aluminum, gamma is blocked by lead, and neutron radiation is blocked by concrete. My question is do these different types of radiation have different effects on the body or are they just classified that way according to their shielding requirements? submitted by /u/firedragonsrule [link] [comments]

Do astronauts in space have to push harder, in order to have a bowel movement? Posted: 16 May 2017 06:30 PM PDT submitted by /u/Resder13 [link] [comments]

If someone is walking down the road, is the air around them moving to avoid the person, or are they more like a knife cutting through the air? Posted: 16 May 2017 12:28 PM PDT submitted by /u/weirdbraxto [link] [comments]

Could a binary star system have a planet tidally locked to the baricenter? Posted: 16 May 2017 02:48 PM PDT submitted by /u/LordBaconus [link] [comments]

What kills you when you burn to death? Posted: 16 May 2017 12:46 PM PDT Ok so the title sounds a bit silly but my question is, What exactly is shutting down or ceasing to function when one burns to death? Obviously burning skin probably wouldn't kill you (not quickly anyway) and pain cant kill people AFAIK So what is the fire doing to your body that causes you to die? is it heatstroke? does the fire burn through your skin and begin directly damaging organs? i was of the understanding fire killed you long before it was able to do this. submitted by /u/ronduun [link] [comments]

If humans have only been around for about 100,000 years, then why did it take 95,000 years for us to do anything rememberable? Did our brains become more evolved in the last few thousand years? Posted: 16 May 2017 07:49 PM PDT The first major civilizations emerged around 5,000 years ago in places like the Middle East. All of recorded history fits approximately within the last 5,000-years. That leaves 95,000 of human history with nothing happening besides changes in the types of spears we used. Where are the wars of conquests and battles between the great empires from 50,000 years ago? Things like this didn't happen because it took 95,000 years to invent agriculture? Are humans from 50,000 years ago just the same as me? It seems amazing that for 95,000 years we did nothing, and just within the last 5,000 years we have gone from cave men to developing the technology to colonize other planets. submitted by /u/some_dude_0123 [link] [comments]

Why does being electrocuted (high voltage) cause a person to die? Posted: 16 May 2017 08:58 PM PDT In conversation with friends, we decided to look this up but after numerous pages on google, the most we got was that it stops your heart. Why does it stop your heart? What prevents a human from being able to withstand higher voltage without dying? Edit: grammar submitted by /u/shirtlessaustin [link] [comments]

Can anyone give an intuitive explanation of gauge theory? Posted: 16 May 2017 04:25 PM PDT Is it possible to explain it in a way which is intuitive? I'm thinking something along the lines of how gravity is "an elastic sheet", but better than that, because that's a terrible analogy... Thanks submitted by /u/toolemeister [link] [comments]

[Physics] Can you fuse elementary particles and their antiparticles together, and what happens if you do? Posted: 17 May 2017 04:51 AM PDT I was wondering if you can fuse the following pairs: -Quarks/Antiquarks -Gluons/Antigluons -Electrons/Positrons Do you still get a Photon for all of them or do you get a new particle. If you get a Photon, how could you create a new particle instead of a Photon? I'm guessing that they have to collide to release their energy as Photons. submitted by /u/Fleeingfromhumanity [link] [comments]

Is there an intuitive way of understanding the contraction mapping theorem? Posted: 16 May 2017 05:59 PM PDT submitted by /u/DodgeEverything [link] [comments]

How stable would elements in the island of stability be? Posted: 16 May 2017 03:46 PM PDT I'm asking because its my understanding that most superheavy elements last for inconceivably short amounts of time. Is it plausible that elements in the island can exist for thousands of years, or may it only be for a few seconds at best? Following on, is there a possibility elements in the island could occur naturally somewhere in the universe? submitted by /u/Khwarezm [link] [comments]

Could someone explain these equations? Posted: 17 May 2017 02:41 AM PDT http://i.imgur.com/JCrYMJS.gif submitted by /u/Chabz1 [link] [comments]

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AskScience AMA Series: We are astrophysicists who translated the motions of seven Earth-sized planets in the TRAPPIST-1 system into music. Ask Us Anything!

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• AskScience AMA Series: We are astrophysicists who translated the motions of seven Earth-sized planets in the TRAPPIST-1 system into music. Ask Us Anything!
• Is it likely that elements 119 and 120 already exist from some astronomical event?
• What is actually happening when I hear my timber framed house 'crack'?
• What would happen to the structure of a radioactive diamond as it decays?
• If fire needs oxygen as fuel then how do rockets work in space?
• Why do we care about the heavy elements like 119 and 120 that decay in like .00002 seconds? What could we possibly use it for?
• What is the difference between the frequentist and the Bayesian meaning of probability?
• Why do faucets hiss at specific levels of valve-openness, which seem random and nonlinear?
• Why does the weak force have two force mediators when the other 3 fundamental forces have one?
• Why can't the Great Barrier Reef be repopulated?
• Is there any weird phenomenon related to the non-existence of the mean of the Cauchy Distribution?
• Are quantum entangled particles subject to time dilation?
• How does the flowregulator on an IV-drip influence pressure beyond said flowregulator? None of my docters can give me a straight answer. Physics-question, not medical.
• What are Lagrangian and Hamiltonian mechanics in a simple sense? Also, why would you use them?
• Why do some trees have purple leaves?
• Why does interacting with a radioactive element (on a quantum level) prevent that element from decaying?
• Does infinity naturally occur physically in the universe?
• What is the physics behind the sound two things make when they are brought together (usually with force) and why does more rigidity in the objects lead to greater volume in this sound?
• [Chemistry] On a molecular level, what makes a sharp object, well, sharp?
• Is there a way to tell if a large piece of structural steel is in compression or tension without damaging it?
• How does H₂ Pd/C "cut" a benzene completely away from a carbon bond?
• What is it about some materials, such as wool, that traps heat very well?
• What is Zero point energy?
• How do proteasome inhibitors help cancer patients?

AskScience AMA Series: We are astrophysicists who translated the motions of seven Earth-sized planets in the TRAPPIST-1 system into music. Ask Us Anything! Posted: 16 May 2017 05:00 AM PDT Check out this short animation about the music of the TRAPPIST-1 planets: https://www.youtube.com/watch?v=7i8Urhbd6eI TRAPPIST-1 is a prime candidate in the search for life beyond our solar system. It is one of the 300 closest stars to us, and hosts seven Earth-sized planets, several of which might have the right temperatures to host liquid water. It also has a remarkably precise orbital configuration. For every 2 times the outermost planet goes around the central star, the progressively interior planets each execute almost exactly 3, 4, 6, 9, 15 and 24 orbits. Such a long so-called resonant chain is unprecedented. We recently translated these rhythmic planetary motions into music. We also assigned planets notes by scaling up their orbital frequencies into the human hearing range. The result is remarkably harmonious thanks to the near-perfect period ratios between planets. You can learn more and experience the awful cacophony generated by more normal systems at http://www.system-sounds.com. One puzzle that has loomed since the discovery of TRAPPIST-1 is how such a tightly spaced system of planets can avoid destroying itself due to repeated gravitational tugs. Our research has revealed a solution that relies on the same harmonic pattern responsible for creating such beautiful music. Thought Cafe, the animation team behind the video is also joining us. We'll be on around 3:30 PM ET (19:30 UT). Ask Us Anything! submitted by /u/AskScienceModerator [link] [comments]

Is it likely that elements 119 and 120 already exist from some astronomical event? Posted: 15 May 2017 12:31 PM PDT I learned recently that elements 119 and 120 are being attempted by a few teams around the world. Is it possible these elements have already existed in the universe due to some high energy event and if so is there a way we could observe yet to be created (on earth) elements? submitted by /u/Beaverchief62 [link] [comments]

What is actually happening when I hear my timber framed house 'crack'? Posted: 16 May 2017 01:27 AM PDT I understand that heating and cooling is responsible for it but are tiny cracks actually being made every time I hear it? submitted by /u/Dallasrallas [link] [comments]

What would happen to the structure of a radioactive diamond as it decays? Posted: 16 May 2017 03:08 AM PDT For a diamond made entirely of carbon-14, which I understand undergoes beta minus decay into nitrogen-14, what will happen to its tetrahedrally bonded structure as individual carbon atoms decay, and are replaced by nitrogen atoms? One idea I had was that the nitrogen escaped the structure leaving gaps in the lattice. If this occurs, would the diamond then conduct electricity, (given a significant proportion of the carbon had decayed) since some carbon atoms will be only bonded to 3 others, and will therefore have free electrons, similar to graphite? Also, if the nitrogen were to escape, would it have to form nitrogen molecules as it does so (and therefore two adjacent carbon atoms would have to had decayed?), or would it leave the structure as singular nitrogen atoms? Finally, could the nitrogen remain tetrahedrally bonded in the structure (forming four bonds to adjacent atoms rather than the usual three)? If so, after all of the atoms have decayed, what would you be left with? Bonus question: would a diamond made of carbon-14 look any different to a regular diamond, i.e. refract light any differently? Sorry this question is so long, but I'd be interested to find out what occurs, or if I have misunderstood the idea completely. submitted by /u/xkimlam [link] [comments]

If fire needs oxygen as fuel then how do rockets work in space? Posted: 15 May 2017 05:31 PM PDT submitted by /u/Look__a_distraction [link] [comments]

Why do we care about the heavy elements like 119 and 120 that decay in like .00002 seconds? What could we possibly use it for? Posted: 15 May 2017 10:33 PM PDT why do we care tho? to prove we can? submitted by /u/KyubeyTheSpaceFerret [link] [comments]

What is the difference between the frequentist and the Bayesian meaning of probability? Posted: 15 May 2017 05:00 PM PDT submitted by /u/Georgifn [link] [comments]

Why do faucets hiss at specific levels of valve-openness, which seem random and nonlinear? Posted: 16 May 2017 01:04 AM PDT It seems really unusual - when the faucet is barely open, it doesn't produce the sound, and it doesn't do so when it is fully open. However, at about 1/4 and 3/4 open (but not at 1/2), there are two levels when it produces a loud hissing sound. How can this be explained? Why is the pattern so nonlinear? Is this something about turbulence? submitted by /u/contravariant_ [link] [comments]

Why does the weak force have two force mediators when the other 3 fundamental forces have one? Posted: 16 May 2017 04:31 AM PDT The strong force has gluons, the electromagnetic has photons, and the gravitational (hopefully) has gravitons. So why is it that the weak force has both W-bosons and Z-bosons? also: While we're on the topic of fields, what are fermionic fields and dirac fields, what physicality do they describe? submitted by /u/ultramadscienti [link] [comments]

Why can't the Great Barrier Reef be repopulated? Posted: 15 May 2017 01:33 PM PDT I am not discounting the problem of coal bleaching and I've seen the pictures. I realize evolution takes a while, so the natural corals in place can't keep up to their environments' changing, but if coral grow in all different environments and depths through the world, why can't marine biologists engineer new, more heat-hardy algae and coral then stimulate them to grow in the dead reefs? I'm sure I'm not the first person to think of this, so what's standing in the way? Why is there this upper limit on temperature when there doesn't seem to be a lower limit, since corals can grow deeper? submitted by /u/Shillarys_Clit [link] [comments]

Is there any weird phenomenon related to the non-existence of the mean of the Cauchy Distribution? Posted: 16 May 2017 05:15 AM PDT I understand how to prove that the mean doesn't exist, but it still feels weird. Is there any interesting mathematical reason for that? I've also read that it appears in physics too. Is there any weird phenomenon related to the non.existence of the mean? submitted by /u/Dash218 [link] [comments]

Are quantum entangled particles subject to time dilation? Posted: 15 May 2017 08:28 AM PDT Let's suppose you have two twin astronauts as described in the Twin Paradox thought experiment. Each of them is given one particle of a quantum entangled pair for safekeeping. One twin remains on Earth, while the other flies away for several years traveling at nearly the speed of light. When he returns to Earth he is younger than his brother. The entangled particles have experienced the same effect as the brothers have, and are brought back together. Are the particles both still entangled in the same time reference to one another? If you collapsed the wave function of one particle would the other "end" collapse at the same time, or would it seem to happen with some sort of delay in relation to the time dilation effect that had been imposed? submitted by /u/wavy9944 [link] [comments]

How does the flowregulator on an IV-drip influence pressure beyond said flowregulator? None of my docters can give me a straight answer. Physics-question, not medical. Posted: 15 May 2017 11:58 AM PDT Non-english speaking. I work in urology. Lately the nurses have had a discussion about flowrate and pressure. I'll try to keep the medical parts of my question simple because this is mainly a physics-question. A patiënt of ours has a drain in his kidney. Basically it's a tube into the plumbing of the kidney. http://patients.uroweb.org/fileadmin/eau_images/images_full/percutaneous-nephrostomy.jpg Mr. X needs to get chemo through this drain to battle cancer inside of his pyelum and ureter (his kidneyplumbing). The higher you hang the IV-bag with chemo, the higher the pressure in the line, the higher the pressure in his kidney. High pressure is BAD for kidneys. Therefore the guidelines state that the IV-bag shouldnt be hung to high (40-50cm max). At half length there is a flowregulator. http://www.thrivingpets.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/i/v/iv_set.gif It's a little wheel that you can adjust to vary the amount of drops that fall into the dripchamber. Assume the lower half of the line stays at the same height and the amount of fluidpressure doesnt change due to an emptying IV-bag. If the IV is hung twice as high but the flowregulator is squeezed so tight that the flowrate (amount of drips) stays the same. Doesnt that mean that the pressure beyond the flowregulator is the same in both instances? Edit: spelling (ofcourse), plus assume the pressure inside the kidney stays the same too. The question is pure about the IV-line. submitted by /u/Critical-Case [link] [comments]

What are Lagrangian and Hamiltonian mechanics in a simple sense? Also, why would you use them? Posted: 15 May 2017 05:01 PM PDT I looked it up and tried to understand it and I kind of get Lagrangian but not Hamiltonian in the slightest. With Lagrangian mechanics: What is the generalized force? Also, what are you actually solving for? With Hamiltonian: Basically what is this? Any examples that would be easy to follow? Thanks in advance submitted by /u/redguy39 [link] [comments]

Why do some trees have purple leaves? Posted: 16 May 2017 05:15 AM PDT I understand that most trees are green because of chlorophyll etc, but why do some trees have purple leaves instead of green ones? submitted by /u/_Callen [link] [comments]

Why does interacting with a radioactive element (on a quantum level) prevent that element from decaying? Posted: 15 May 2017 07:25 PM PDT I noticed this a few times in different articles. Most recently in an article about transmitting information without particle exchange (via light wave phase). They said that measuring/interacting with the element suppresses its radioactive decay. How/why does this happen? Does this mean that you can indefinitely keep a radioactive element from decaying? For days, months, years? Even the super heavies which usually decay almost instantly? submitted by /u/chipstastegood [link] [comments]

Does infinity naturally occur physically in the universe? Posted: 15 May 2017 05:09 PM PDT Is there any evidence that shows something goes to infinity in nature? Like there is infinite time, or infinite space in the universe? If there is no evidence suggesting that, does that mean there may be a finite amount of time or space? What would be the implications of that? submitted by /u/trev-dogg [link] [comments]

What is the physics behind the sound two things make when they are brought together (usually with force) and why does more rigidity in the objects lead to greater volume in this sound? Posted: 15 May 2017 04:28 PM PDT submitted by /u/FoxyGramps [link] [comments]

[Chemistry] On a molecular level, what makes a sharp object, well, sharp? Posted: 15 May 2017 10:49 AM PDT submitted by /u/Baron_Sigma [link] [comments]

Is there a way to tell if a large piece of structural steel is in compression or tension without damaging it? Posted: 15 May 2017 08:31 AM PDT Having a discussion with my SO and we couldn't get a satisfactory answer to this one. She's a structural engineer, and at one of her projects there's a mysterious (and very large) steel prop which seems to be holding up a building. They can't remove or replace it without knowing whether it's in tension or compression... but they don't know how to find out which. Would the conductivity of a steel change if it's in tension or compression? submitted by /u/DugTheDog [link] [comments]

How does H₂ Pd/C "cut" a benzene completely away from a carbon bond? Posted: 16 May 2017 12:04 AM PDT Ok so I'm an organic chemistry undergraduate and out professor challenged us wit a graduate problem. I know H₂ Pd/C breaks double bonds apart but with a benzene ring attached to a carbon group (BnO-R to be specific) why does it break the benzene completely away from the O-R group? Why not just take out all the double bonds in benzene and make it a simple cyclohexane? submitted by /u/20needHelpPlease [link] [comments]

What is it about some materials, such as wool, that traps heat very well? Posted: 15 May 2017 07:53 PM PDT submitted by /u/agenteDEcambio [link] [comments]

What is Zero point energy? Posted: 15 May 2017 12:34 PM PDT So what is zero point energy and what can it be used for? I see definitions all the time but I just don't know what they mean. So if someone can simplify the definition as best as possible for me, I would be really appreciate it. submitted by /u/WhiteSox1415 [link] [comments]

How do proteasome inhibitors help cancer patients? Posted: 15 May 2017 11:26 PM PDT If cancer cells divide rapidly and create misfolded proteins and antibodies, then how does it help to inhibit the protein which breaks these misfolded proteins down? submitted by /u/paulgrylls [link] [comments]

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Are there ways to find caves with no real entrances and how common are these caves?

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• Are there ways to find caves with no real entrances and how common are these caves?
• Does Psychopathy exist on a spectrum or is it a binary phenomena; you either are or aren't?
• What allows light to pass through clear solids like glass, but not through walls/trees etc?
• Does charging your phone slower, by connecting it to a pc by usb-a, makes the battery last longer than connecting directly into a outlet?
• How much, if at all, do other stars' heat and light affect the Earth?
• How do sturrup pumps achieve such high pressures (3000psi), while conventional pumps generally only go up to 260psi?
• How can anthropogenic climate change (global warming) cause the earth to dry up when more water becomes part of the hydrologic cycle as ice caps and glaciers melt?
• Is there a "maximum loudness"?
• Why does water vapor or steam rise (and not fall or just stay at the same level)?
• Approximately how much solar energy could be harnessed between the Tropics of Cancer and Capricorn?
• If higher spatial dimensions could be visualized, then would all of their axes be perpendicular to each other?
• Why are Mexicans half as likely to develop/die from cancer than US/Canadian citizens?
• Could the substance known as "atomic trampoline" be used as a shield for space craft or even body armour?
• Is it possible to melt wood?
• Why is it that when we rub wool on a balloon, the balloon becomes negatively charged and not vice-versa?
• In Pancreatic Islet Transplants, what is stopping the transplanted islets from being destroyed again?
• Is there a cap on human intelligence?
• Is the speed of sound directly proportional to density of the medium ? And if so, at how high density would sound travel faster than light ? If it's even possible.
• Why does a satellite stay at a constant speed?
• Why is tritium often used in elemental gaseous form instead of in compounds?
• How exactly does nuclear fallout work?
• Are there different constellations on Mars?
• Why aren't there lunar eclipses once a month?

Are there ways to find caves with no real entrances and how common are these caves? Posted: 14 May 2017 08:22 PM PDT I just toured the Lewis and Clark Caverns today and it got me wondering about how many caves there must be on Earth that we don't know about simply because there is no entrance to them. Is there a way we can detect these caves and if so, are there estimates for how many there are on Earth? submitted by /u/mastuhcowz8 [link] [comments]

Does Psychopathy exist on a spectrum or is it a binary phenomena; you either are or aren't? Posted: 14 May 2017 07:16 PM PDT I've been looking into a lot of work and articles and most of the literature just says that "Psycopaths are _" or "Psychopaths exhibit _." There is also more literature that says many psychopaths function within society without going as far as murder, but still can harm others. But I haven't seen too much on whether or not there is a spectrum of psychopathy; only that there is a checklist, or we can check brainwaves, etc. Can one be partially psychopathic? Just a little psychopathic? submitted by /u/wittyname83 [link] [comments]

What allows light to pass through clear solids like glass, but not through walls/trees etc? Posted: 14 May 2017 05:52 PM PDT submitted by /u/Candlefoot [link] [comments]

Does charging your phone slower, by connecting it to a pc by usb-a, makes the battery last longer than connecting directly into a outlet? Posted: 14 May 2017 08:25 PM PDT submitted by /u/paulora2405 [link] [comments]

How much, if at all, do other stars' heat and light affect the Earth? Posted: 14 May 2017 08:15 PM PDT submitted by /u/8bitzawad [link] [comments]

How do sturrup pumps achieve such high pressures (3000psi), while conventional pumps generally only go up to 260psi? Posted: 14 May 2017 05:36 PM PDT I want to know what mechanism is involved here. Generally, for PCP airguns, you need a specialized pump that enables the pressure to ratchet up to very high pressures of 2000 - 3000 psi. submitted by /u/Thanhtacles [link] [comments]

How can anthropogenic climate change (global warming) cause the earth to dry up when more water becomes part of the hydrologic cycle as ice caps and glaciers melt? Posted: 14 May 2017 05:14 PM PDT I thought that the earth was more dry than it is now during the last ice age when more water was trapped in ice caps and glaciers and wetter during times when there was no permanent ice. edit. I've seen predictions of the earth becoming drier with larger deserts due to climate change. submitted by /u/Idle_Redditing [link] [comments]

Is there a "maximum loudness"? Posted: 14 May 2017 07:52 PM PDT This may seem like a silly question, but I'm genuinely curious: what's the very loudest something can possibly be? Is there a cap? submitted by /u/theepicelmo [link] [comments]

Why does water vapor or steam rise (and not fall or just stay at the same level)? Posted: 15 May 2017 06:18 AM PDT When you boil water on a stove, you can the steam rise. If water vapor is just small droplets of water, why does it rise? And is this the same mechanism at work when water on the ocean surface evaporates to form water vapor in the air? submitted by /u/regstuff [link] [comments]

Approximately how much solar energy could be harnessed between the Tropics of Cancer and Capricorn? Posted: 15 May 2017 05:16 AM PDT submitted by /u/AndToThinkIThought [link] [comments]

If higher spatial dimensions could be visualized, then would all of their axes be perpendicular to each other? Posted: 14 May 2017 04:48 PM PDT If I were an N dimensional hyper-being with a protractor, and I measured the angle between ever pair of the axes of the N dimensions, would all of the angles be 90 degrees, or is there a more abstract notion of what it means to be perpendicular in higher dimensions? submitted by /u/iprobablydontknowyou [link] [comments]

Why are Mexicans half as likely to develop/die from cancer than US/Canadian citizens? Posted: 14 May 2017 08:42 PM PDT This question is based off 2012 statistics provided by the International Agency for the Research of Cancer http://www.cancerindex.org/Mexico It looks like the same is similar for other less-than-first-world countries. Is this reflective of reality or a product of dissimilar statistical sources? submitted by /u/WillPrlySugstClassix [link] [comments]

Could the substance known as "atomic trampoline" be used as a shield for space craft or even body armour? Posted: 14 May 2017 01:15 PM PDT I'm talking about the substance made of several different elements in this gif submitted by /u/Shappers [link] [comments]

Is it possible to melt wood? Posted: 14 May 2017 03:27 PM PDT Are there any conditions where you could heat up wood and turn it into some kind of "liquid wood"? submitted by /u/Cranfres [link] [comments]

Why is it that when we rub wool on a balloon, the balloon becomes negatively charged and not vice-versa? Posted: 15 May 2017 06:48 AM PDT I asked this question last time on a different subreddit, but the only reply so far stated that the answer was difficult to put simply. In any case, one of my friends while studying for IB asked me this, and I wondered the same thing. We were always told that when we rub wool on a balloon, the electrons will always go to the balloon instead of the wool. Why is this so? Why can't the wool, instead, take charges away from the balloon? What is the difference between the two in terms of molecular structure such that the wool will give away the electrons at most circumstances? submitted by /u/SparklesMcSpeedstar [link] [comments]

In Pancreatic Islet Transplants, what is stopping the transplanted islets from being destroyed again? Posted: 15 May 2017 02:56 AM PDT I was reading an article about transplanting the Islets of Langerhans, this question popped in my head and I couldn't find an answer myself. submitted by /u/PrincessDextrose [link] [comments]

Is there a cap on human intelligence? Posted: 15 May 2017 06:04 AM PDT submitted by /u/Crafty131 [link] [comments]

Is the speed of sound directly proportional to density of the medium ? And if so, at how high density would sound travel faster than light ? If it's even possible. Posted: 15 May 2017 02:01 AM PDT What is speed of sound in the densest thing ever possible ? submitted by /u/FlexarCZ [link] [comments]

Why does a satellite stay at a constant speed? Posted: 14 May 2017 03:45 PM PDT Quick question about satellites in orbit: If you fire a projectile horizontally off a clip, the magnitude of its velocity will increase over time because a vertical component is slowly being added to the projectile's velocity. When it hits the ground, it will have both a sizable vertical component and horizontal component. Why does a satellite not gain this same vertical component like a projectile does? Isn't the only difference between the start of a satellite's orbit and the projectile in the above example that the satellite starts at a much greater horizontal velocity, which allows it to essentially outrun the earth's curvature? I feel like I am missing something basic here. Thanks for any help! submitted by /u/DoctaProcta95 [link] [comments]

Why is tritium often used in elemental gaseous form instead of in compounds? Posted: 14 May 2017 07:46 PM PDT When tritium is used for its radioactivity, such as in glowing vials or exit signs, it always seems to be used in elemental, gaseous form. Why is this? Can't it escape very slowly even from totally sealed containers in that form? Why isn't tritiated water or some other compound that won't escape used instead? submitted by /u/josephcsible [link] [comments]

How exactly does nuclear fallout work? Posted: 15 May 2017 02:42 AM PDT If another country wanted to bomb, say, San Fransisco, and I lived elsewhere in California at 4500+ feet above sea level, how would the bomb impact my surroundings? submitted by /u/hufflepuffprincess [link] [comments]

Are there different constellations on Mars? Posted: 14 May 2017 06:33 PM PDT submitted by /u/BigDrew42 [link] [comments]

Why aren't there lunar eclipses once a month? Posted: 14 May 2017 03:39 PM PDT My understanding is that lunar eclipses occur when the Earth gets in between the moon and the sun. Shouldn't this always happen once a month, when the moon is on the opposite side of the Earth from the sun? submitted by /u/bebr117 [link] [comments]

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