Earthquake Megathread

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• Earthquake Megathread
• If a nuclear bomb went off in Boston harbor could scientists tell after the fact who had manufactured it, do they leave distinct radioactive signatures?
• Do black holes have electromagnetic field?
• How many layers are there in a modern integrated circuit?
• Do people that have degenerative diseases such as Alzheimer's lose their muscle memory as well?
• How is it possible that something as large as a possible Planet 9 has completely evaded visual observation?
• How did they measure hurricane wind speeds in the 1800's?
• Why does the Earth's rotation effect Rockets and not Planes?
• What is happening at a molecular level when a knife cuts through nylon rope?
• How is it that scissors can curl ribbons?
• Would global cooling create more land? If so, how much more land would be available before the whole earth freezes?
• Why is caesium the largest atom? Shouldn't element 118 be the largest?
• Does my peripheral vision have a different latency than objects I look directly at?
• [CHEMISTRY] How do chemical companies determine if one ingredient in a solution can be replaced by another?
• Do snakes that can 'see' heat, such as ball pythons, compare their 'heat vision' with their normal vision?
• What defines an equation of state?
• Can a human be allergic to any substance? As in, does every material have the potential to elicit an allergic response?
• Why is gold found in seams?
• On an alien planet, would a regular compass still point true north?
• In emergencies like on CDMX will using cellphone data on a very far state affect the capacity on CDMX cell towers to make calls and/or use cell phone data?
• Can someone with reading Aphasia "read" in Braille?

Earthquake Megathread Posted: 19 Sep 2017 01:19 PM PDT Hi everyone! Unfortunately, there have been recent reports of another earthquake in Mexico, a magntiude 7.1 centered about 100 miles from Mexico City. We had a previous megathread discussing the last earthquake (magnitude 8.1) off the coast less than two weeks ago. If you've got more questions about earthquakes, feel free to ask those here! Panel members will be in and out throughout the day so please do not expect an immediate answer. Again, for hurricane questions, please direct them to our hurricane megathread instead. Useful links: USGS Report NY Times - "Powerful Earthquake Strikes Mexico" BBC - "Mexico: Strong quake strikes, collapsing buildings" Reuters - "Strong 7.1 quake hits Mexico, people trapped in collapsed buildings" submitted by /u/AskScienceModerator [link] [comments]

If a nuclear bomb went off in Boston harbor could scientists tell after the fact who had manufactured it, do they leave distinct radioactive signatures? Posted: 19 Sep 2017 11:59 PM PDT Asking for a friend submitted by /u/plato1123 [link] [comments]

Do black holes have electromagnetic field? Posted: 19 Sep 2017 11:44 PM PDT I read that black holes have three properties mass, spin, and charge. But if they have charge, then thet have an electromagnetic field. But then electromagnetic fields are described that carried by virtual photons. But nothing can leave a black hole event horizon, not even photons. What am I missing? submitted by /u/gibizer [link] [comments]

How many layers are there in a modern integrated circuit? Posted: 20 Sep 2017 12:48 AM PDT I'm getting how the raster dictates density of elements in IC in the horizontal plane over the wafer. But as I understand, there's the third dimension - so far mostly untapped because of heat dissipation necessity; the bit of wafer in a CPU is a rather flat square, not a cube. Still, if my understanding is correct, there's more than a single layer of the components on the wafer, they are stacked to a degree. How many layers though? And how thick such a layer is? submitted by /u/sharfpang [link] [comments]

Do people that have degenerative diseases such as Alzheimer's lose their muscle memory as well? Posted: 19 Sep 2017 02:34 PM PDT submitted by /u/Old__lamp [link] [comments]

How is it possible that something as large as a possible Planet 9 has completely evaded visual observation? Posted: 19 Sep 2017 07:17 PM PDT I've heard that if there actually is a Planet 9, it's more than 10x the size of Earth. I understand that Planet 9 is extremely far away, but it seems that something that large could not avoid being seen for so long. How can it be that all of Earth's astronomers have missed it for so long? submitted by /u/lonewanderer44 [link] [comments]

How did they measure hurricane wind speeds in the 1800's? Posted: 19 Sep 2017 06:12 PM PDT Saw a post on facebook indicating the history of cat 5 hurricanes, and was curious how they measured wind speed as far back as 1850. Also, should I cross post this to r/AskHistorians? submitted by /u/coolscreenname [link] [comments]

Why does the Earth's rotation effect Rockets and not Planes? Posted: 20 Sep 2017 06:10 AM PDT Most rockets are launched into a prograde orbit as it's more efficient to do so with the earth's rotation. If I were to fly around the equator the planes their relative velocity would just be it's speed because it's already traveling at the speed of the earth's rotation before take off. Not matter what direction due to the reference frame or say a person on the ground both would appear at going the same speed just in alternate directions. (Assuming no other influence the efficiency will be the same). If I were to launch a rockets at the equator from the same locations into an orbit one with the rotation and one against it why then do we need to think about the earth's rotation for efficiency? Probably something simple but I can't get my head around it, hope you understand what I'm asking. Thanks. submitted by /u/RandomQuestion567 [link] [comments]

What is happening at a molecular level when a knife cuts through nylon rope? Posted: 19 Sep 2017 03:14 PM PDT submitted by /u/YorkHenderson [link] [comments]

How is it that scissors can curl ribbons? Posted: 19 Sep 2017 05:51 PM PDT Everytime I wrap a gift, I always ended it with the ribbon,on the gift (or box) being curled. I wondered how that happens. submitted by /u/TheMainEngy [link] [comments]

Would global cooling create more land? If so, how much more land would be available before the whole earth freezes? Posted: 19 Sep 2017 10:05 PM PDT My hypothesis is based on the reverse of the polar ice caps melting. If there was a global cooling, then I imagine the polar ice caps would grow in size (more water freezes) and the ocean level would get lower, baring more land. submitted by /u/_goodboy [link] [comments]

Why is caesium the largest atom? Shouldn't element 118 be the largest? Posted: 19 Sep 2017 01:55 PM PDT submitted by /u/SomeGuyYouKnow_ [link] [comments]

Does my peripheral vision have a different latency than objects I look directly at? Posted: 19 Sep 2017 04:28 PM PDT For example. I have a timer counting down from 60. The timer is displayed in two spots on the left and the right. If I watch the timer on the right directly and the timer on my left is in my peripheral vision, do I see the timer on the left update after the timer on the right? Or do I see them update at the same time? Is this a real latency or a perceived latency? submitted by /u/_Guinness [link] [comments]

[CHEMISTRY] How do chemical companies determine if one ingredient in a solution can be replaced by another? Posted: 19 Sep 2017 09:22 AM PDT If two chemicals aren't the same, how would a company determine if something is a good replacement? submitted by /u/ClevalandFanSadface [link] [comments]

Do snakes that can 'see' heat, such as ball pythons, compare their 'heat vision' with their normal vision? Posted: 19 Sep 2017 06:22 PM PDT I have a pet ball python, and I've been wondering this for a while. Basically, do pythons identify, with their normal vision, the source of the heat? The process I am imagining is just like the way humans compare their hearing to their sight, in order to identify the source of the noise. Am I correct at all, or do they interpret the senses completely differently? submitted by /u/derekthesnake [link] [comments]

What defines an equation of state? Posted: 19 Sep 2017 07:54 PM PDT I'm taking a thermodynamics course and learning about State Functions and Equations but am confused by some of the finer details. For example I can see online that enthalpy has an equation dH(S,P)= TdS + VdP. Is this considered an equation of state, or are the relations (dH/dS)p=T and (dH/dP)s=T the equations of state? Most publications I can find seem to use equations of state as a stepping stone for Maxwell equation or other derivations and don't spend any time specifically defining what equations of state are. submitted by /u/Meto1183 [link] [comments]

Can a human be allergic to any substance? As in, does every material have the potential to elicit an allergic response? Posted: 19 Sep 2017 10:51 AM PDT submitted by /u/QuinneAgain [link] [comments]

Why is gold found in seams? Posted: 19 Sep 2017 07:35 AM PDT I know that heavier elements basically form during supernovas, and I think the heaviest element a star like our sun will produce would be iron. So, the gold and all of the other heavy elements explode in an incredible display of violence, across the galaxy. Then we fast forward on to present day, and a bunch of the gold on earth has collected into a "seam". What's the geological process for this? And are we just incredibly lucky to have reasonably significant amounts of most naturally occuring elements? submitted by /u/Serendiplodocus [link] [comments]

On an alien planet, would a regular compass still point true north? Posted: 19 Sep 2017 07:33 AM PDT On Earth, "magnetic north" (the direction that compasses point) and one of the Earth's axes ("true north") happen to be in approximately the same place. This seams too neat and clean to be a coincidence, so would the same thing happen on an average alien planet with a magnetic field? Are magnetic poles 'drawn' to the axes of a planet, or is that just coincidence? submitted by /u/sixcubit [link] [comments]

In emergencies like on CDMX will using cellphone data on a very far state affect the capacity on CDMX cell towers to make calls and/or use cell phone data? Posted: 19 Sep 2017 08:56 PM PDT submitted by /u/DoctorWamytt [link] [comments]

Can someone with reading Aphasia "read" in Braille? Posted: 19 Sep 2017 08:26 AM PDT So in class, my psych teacher was explaining how damage to the Angular Gyrus leads to aphasia, specifically Aphasia where you can't read properly. I was wondering if this also extends to and affects Braille. submitted by /u/Kufu1796 [link] [comments]

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There is a video on the Front Page about the Navy's Railgun being developed. What kind of energy, damage would these sort of rounds do?

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• There is a video on the Front Page about the Navy's Railgun being developed. What kind of energy, damage would these sort of rounds do?
• In 1972 a woman fell 33,332 feet without dying. How is that possible?
• Could we railgun the Moon?
• In physics, why is the formula to calculate force F=ma instead of F=mv (mass x velocity)?
• How is online gaming possible if there must be some delay?
• How do rainbows that curve away from the sun work?
• Why aren't there any orbitals after s, p, d and f?
• What is the Theoretical Limit on the Energy Density of Ultracapacitors?
• When I tear open plastic packaging (like a bag of chips or any type of plastic packaging) , are chemical bonds being broken? What is happening on the molecular level during the tearing?
• How accurate is it theoretically possible for weather forecasting to be? For example, with a powerful enough supercomputer, will we eventually be able to predict the exact track of a hurricane weeks in advance? Are there any other factors limiting prediction accuracy aside from computing power?
• Why Does Distilled Water Evaporating Slower Than Tap Water?
• For a reaction with a given reaction mechanism, is the activation energy a constant?
• What is gravity like at the center of the Earth?
• What Does Sagittarius A* Look Like?
• Do the radioactive elements in nuclear weapons emit detectable radiation?
• Does the heating of the earths surface during summer months affect plate tectonics?
• Since the surface of the Sun is only ~14 times hotter than my oven when I'm baking a pizza, why am I able to feel the Sun's heat from 93 million miles away?
• Iron Man's arc reactor could theoretically work by using Palladium isotopes, how much energy could this produce and how difficult would it be to make?
• What causes the smoke cloud around a railgun's barrel if it doesn't use gunpowder or explosive propellant?
• What is the speed difference between the different mass state components of neutrinos in flight?
• No-slip condition with a draining pipe?
• Why do lots of Viruses (Ebola, Bubonic Plague etc) present with Flu like symptoms? How can someone tell the difference?

There is a video on the Front Page about the Navy's Railgun being developed. What kind of energy, damage would these sort of rounds do? Posted: 18 Sep 2017 10:25 AM PDT https://www.reddit.com/r/videos/comments/70u6sy/the_us_navy_has_successfully_tested_the_first/ http://breakingdefense.com/2017/05/navy-railgun-ramps-up-in-test-shots/ "Consider 35 pounds of metal moving at Mach 5.8. Ten shots per minute" What kind of damage would these do? Would the kinetic energy cause an explosion? For that type of projectile what would a current type of TNT/Weapon be in damage potential? submitted by /u/irrelevant_query [link] [comments]

In 1972 a woman fell 33,332 feet without dying. How is that possible? Posted: 18 Sep 2017 10:58 AM PDT submitted by /u/loggydawg [link] [comments]

Could we railgun the Moon? Posted: 19 Sep 2017 01:59 AM PDT Is the reach of the US Navy railgun long enough to reach the Moon? submitted by /u/Borsippian [link] [comments]

In physics, why is the formula to calculate force F=ma instead of F=mv (mass x velocity)? Posted: 18 Sep 2017 09:47 PM PDT For example, if a car that weighs 2 kilograms his traveling at a constant speed of 31 meters a second as the car hits you. It would give you a fair amount of force right? But the formula states that since the car is not accelerating and is at a constant speed, a=0, since 2,000 x 0 = 0 the formula says that the car hits you with a force of 0 newtons (which I don't think is accurate) Even if the car started at 0 m/s and started to accelerate at 2m/s/s wouldn't the calculations still be wrong and have an incorrect amount of force calculated? submitted by /u/kool_kolumbine_kid [link] [comments]

How is online gaming possible if there must be some delay? Posted: 19 Sep 2017 02:26 AM PDT Online communication always has a delay, especially when people communicating are on opposite sides of the US. If that's the case, then how are fast FPS video games, like Call of Duty, possible to play online? submitted by /u/Master_Vicen [link] [comments]

How do rainbows that curve away from the sun work? Posted: 18 Sep 2017 09:52 AM PDT As I walked to work today I saw a iridescent cloud above, and it wasn't just that but a full rainbow (or two if you look closely enough). After some walking I notice that the rainbow curved away from the sun, and was not centered around it (as seen in the image). Normal rainbows result from by water-droplets acting like a really bad lens/mirror and sending a chromatic aberration at the observer. No matter if it's mirror or lens, it's always centered around the sun (or without clear curve in the case of iridescent clouds). Yet I don't know how these work, as they're clearly curved, and that away from the sun. submitted by /u/GregTheMad [link] [comments]

Why aren't there any orbitals after s, p, d and f? Posted: 19 Sep 2017 07:29 AM PDT After Element 60 I noticed that there weren't any new orbitals anymore, there were just "more of the others". Why is that? Anything to do with energylevels? submitted by /u/wolfgertripathi [link] [comments]

What is the Theoretical Limit on the Energy Density of Ultracapacitors? Posted: 19 Sep 2017 02:48 AM PDT For example the specific energy of uranium 235 is about 700k MJ/kg, and supercapacitors top out at 30 MJ/kg. What would be the theoretical limit for the ultracapacitors that are being researched today? I've heard several orders of magnitude so I'd guess that means 3k+ MJ/kg. What's the maximum theoretical limit for specific energy for a capacitor with known laws of physics? What formulas are used to determine the theoretical limits here? submitted by /u/Radiatin [link] [comments]

When I tear open plastic packaging (like a bag of chips or any type of plastic packaging) , are chemical bonds being broken? What is happening on the molecular level during the tearing? Posted: 18 Sep 2017 01:35 PM PDT submitted by /u/bparkerson04 [link] [comments]

How accurate is it theoretically possible for weather forecasting to be? For example, with a powerful enough supercomputer, will we eventually be able to predict the exact track of a hurricane weeks in advance? Are there any other factors limiting prediction accuracy aside from computing power? Posted: 18 Sep 2017 01:28 PM PDT submitted by /u/poozemusings [link] [comments]

Why Does Distilled Water Evaporating Slower Than Tap Water? Posted: 18 Sep 2017 11:39 AM PDT Sorry if this has been asked before, I searched around didn't see anything but assumed this would've come up before. Anyways, so my wife uses distilled water to clean baby bottles and stuff like that in one of those steamers. Well she pointed out to me the other day that, when she sets the bottle down on the drying rack, the little droplets of distilled water don't evaporate very quickly. They'll sit there for a few days without evaporating she said. I didn't really believe her so we did an experiment where we had identical bottles. Both cleaned with distilled water in the steamer but we rinsed one with tap water, then set them both in the same position next to each other on the drying rack. By the evening, the tap-water-rinsed bottle was completely dry but the distilled only bottle was still covered with those droplets on the inside. What's going on here? submitted by /u/Throwaway----4 [link] [comments]

For a reaction with a given reaction mechanism, is the activation energy a constant? Posted: 18 Sep 2017 10:59 AM PDT I know that catalysts use a different reaction mechanism with a lower activation energy, but for a given mechanism, does the activation energy change with respect to temperature, pressure, or reactant concentration? submitted by /u/vitcaffeine [link] [comments]

What is gravity like at the center of the Earth? Posted: 18 Sep 2017 11:59 AM PDT So say you were able to reach the center of the Earth, what would gravity be like? Would there be a sense of getting pulled in a direction (down?), or would you be weightless like in space? submitted by /u/GoodGuyPolarBear [link] [comments]

What Does Sagittarius A* Look Like? Posted: 18 Sep 2017 09:32 AM PDT Suppose we were able to exist at a safe distance from Sagittarius A*. Perhaps we are in Carl Sagan's Ship of the Imagination. What would we see? What about various distances? Do the stars that orbit it move fast enough for us to see with the naked eye? Is there visible matter surrounding it? What would such a hole in space even look like? How would it bend light and spaetime? Etc... etc... etc... I am an author writing a story about a man who has visions of Sagittarius A* and I want his visions to be accurate despite the fact that he is insane. submitted by /u/JoshuaGoudreau [link] [comments]

Do the radioactive elements in nuclear weapons emit detectable radiation? Posted: 18 Sep 2017 03:35 PM PDT I am curious to know whether nuclear weapons emit detectable radiation at any stage of their lifecycle. For the sake of argument, let's say we are considering a thermonuclear hydrogen bomb, but if someone feels like sharing any expertise on fission weapons too, great. Intuitively, I'd think that there would have to be a certain amount of radiation released during construction of these weapons just by passive decay of any uranium or plutonium involved in the construction...but what about after they are completed? Do they emit radiation during transport, storage, and/or once in-flight towards a target? How would such radiation be mitigated - lead-shielded transport containers, perhaps? Is there any hope of us ever developing some kind of "early warning system" to detect such radiation that would allow us to say, "That missile/bomb/etc. that is on a ballistic trajectory is/is not armed with a nuclear warhead" - ? Thank you in advance to anyone who cares to comment. submitted by /u/RaspersProgress [link] [comments]

Does the heating of the earths surface during summer months affect plate tectonics? Posted: 18 Sep 2017 06:23 PM PDT Is there more or less movement in summer months due to the surface expanding with heat. Or the opposite with shrinking during the colder months? submitted by /u/Delittle3 [link] [comments]

Since the surface of the Sun is only ~14 times hotter than my oven when I'm baking a pizza, why am I able to feel the Sun's heat from 93 million miles away? Posted: 18 Sep 2017 02:01 PM PDT submitted by /u/DownvoteIfYoureHorny [link] [comments]

Iron Man's arc reactor could theoretically work by using Palladium isotopes, how much energy could this produce and how difficult would it be to make? Posted: 18 Sep 2017 05:40 PM PDT I recently re-watched iron man after having only seen it at an fairly young age. And realized that the arc reactor uses palladium, which I was fairly certain was radioactive, after some research because why not I found this article, which states that one of the most plausible methods for Iron mans arc reactor to operate is by utilizing the electron capture of Palladium-103 and beta decay of Palladium-107 as a circuit, my main questions are: A, does this work? B, How much power would this produce? C, what is humanity missing to make this if anything? submitted by /u/AlexStorm1337 [link] [comments]

What causes the smoke cloud around a railgun's barrel if it doesn't use gunpowder or explosive propellant? Posted: 18 Sep 2017 06:49 AM PDT https://www.youtube.com/watch?time_continue=93&v=QO_zXuOQy6A Saw this video on another sub and noticed the plume of smoke. Another video indicated that this was molten iron, but I'm not sure how that would turn into a cloud rather than clumps of glowing metal. submitted by /u/Duke_Paul [link] [comments]

What is the speed difference between the different mass state components of neutrinos in flight? Posted: 18 Sep 2017 04:46 PM PDT According to wikipedia, "Neutrinos oscillate between different flavors in flight. For example, an electron neutrino produced in a beta decay reaction may interact in a distant detector as a muon or tau neutrino. This oscillation occurs because the three mass state components of the produced flavor travel at slightly different speeds, so that their quantum mechanical wave packets develop relative phase shifts that change how they combine to produce a varying superposition of three flavors." So when they say there is a small difference in speed between the different components of flavor, do they mean like a number really close to 0 is the difference in speed, or a larger number? submitted by /u/iadd [link] [comments]

No-slip condition with a draining pipe? Posted: 18 Sep 2017 04:47 PM PDT So for a cylinder with fluid moving through it I can see how the math works out for the no slip condition, but how does that work in scenarios where A. the cylinder isn't completely filled to the top, and B. where it's draining to the point of being empty? Particularly for B., if the no slip condition requires no velocity at the surface boundary, how can I do something as ordinary as completely emptying a cup of water I've tipped on its side to drink from it? submitted by /u/Khenghis_Ghan [link] [comments]

Why do lots of Viruses (Ebola, Bubonic Plague etc) present with Flu like symptoms? How can someone tell the difference? Posted: 18 Sep 2017 12:53 PM PDT submitted by /u/PusheenIsMyHomegirl [link] [comments]

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Was working at Jimmy John's today when I customer came in and was severely allergic to cucumbers but could eat pickles, how's that possible?

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• Was working at Jimmy John's today when I customer came in and was severely allergic to cucumbers but could eat pickles, how's that possible?
• Is all matter composed of stardust?
• In terms of evolution, why is vitamin D synthesis dependent on exposure to sunlight?
• Why does the sun and the full moon appear bigger when near the horizon?
• Does the "location" of a headache say anything about its cause?
• We have maps of what the continents looked like millions of years ago when they were all together. How accurately can we map what the continents will look like millions of years from now?
• How do you explain photoelectric effect using quantum mechanics?
• As time progresses, does the perimeter of the visible universe recede because photons (albeit redshifted ones) from distant stars finally reach us, or does it get closer because inflation pushes stars at the edge of the visible universe away faster than their light can get to us?
• Is it possible to micro dose a poison and eventually gain immunity?
• What is the ph of liquid co2?
• Why does tidal acceleration happen sattelites that orbit a oceanless planet?
• Would mechanically moving electrons create a super-strong magnetic field?
• What are the physiological mechanisms through which "sonic weapons" could cause symptoms such as traumatic brain injury?
• My Uncle was just diagnosed with Creutzfeldt-Jakob disease (CJD), a prion disease. What makes these disorders so hard, to impossible to treat?
• What would happen if only your arm and nothing else was exposed to a vacuum?
• What makes you feel 'full' ?
• Can organ transplant recipients be organ donors?
• Why is it when I drink something really sour my cheek muscles tighten?
• Why is it bad to shampoo my hair everyday?
• [Chemistry] How do you know how many isotopes of atom exist?
• How does the distance between subatomic particles work?
• Why is Jupiters surface/atmosphere so volatile?
• Why are the hands facing forward in anatomical position?

Was working at Jimmy John's today when I customer came in and was severely allergic to cucumbers but could eat pickles, how's that possible? Posted: 17 Sep 2017 06:46 PM PDT submitted by /u/ZeusTheMooose [link] [comments]

Is all matter composed of stardust? Posted: 18 Sep 2017 03:12 AM PDT And if not, just how much matter that we know and see, including our own selves, is made up of the remnants of ancient stars? Literally blows my mind that we are the product of what happens when a burning ball of hydrogen is left alone for so long, that it eventually evolves the ability to ask where it came from (us). submitted by /u/Shayneepoo13 [link] [comments]

In terms of evolution, why is vitamin D synthesis dependent on exposure to sunlight? Posted: 17 Sep 2017 06:47 PM PDT submitted by /u/keevesnchives [link] [comments]

Why does the sun and the full moon appear bigger when near the horizon? Posted: 17 Sep 2017 06:45 PM PDT submitted by /u/C_Sha [link] [comments]

Does the "location" of a headache say anything about its cause? Posted: 17 Sep 2017 11:56 AM PDT submitted by /u/BlackViperMWG [link] [comments]

We have maps of what the continents looked like millions of years ago when they were all together. How accurately can we map what the continents will look like millions of years from now? Posted: 17 Sep 2017 12:20 PM PDT submitted by /u/Euthy [link] [comments]

How do you explain photoelectric effect using quantum mechanics? Posted: 18 Sep 2017 04:05 AM PDT I understand that photoelectric effect can be explained using photons, where light comes in quantised, discreet amount of energy. I also understand that the wave-particle duality theory isn't strictly true and it's more of a probablity wave. How do you explain the photoelectric effect then? How does the electron and photon interact when they exist as a cloud of probabilities? Am I missing something in my understanding? Thank you submitted by /u/zhrmghg [link] [comments]

As time progresses, does the perimeter of the visible universe recede because photons (albeit redshifted ones) from distant stars finally reach us, or does it get closer because inflation pushes stars at the edge of the visible universe away faster than their light can get to us? Posted: 17 Sep 2017 07:15 PM PDT I'm not asking about the absolute size of the visible universe; I'm asking if the number of stars inside the boundary line is increasing or decreasing (stellar lifecycles aside!) submitted by /u/Glaselar [link] [comments]

Is it possible to micro dose a poison and eventually gain immunity? Posted: 17 Sep 2017 11:54 AM PDT I'm thinking like what happened in the film The Princess Bride. The idea is that if you were to take enough aspirin to the point where regular sized doses don't really affect you, would you be able to do the same with something like cyanide for example? I know movies are usually BS but is there any basis in fact there? submitted by /u/Oly-SF-Redwood [link] [comments]

What is the ph of liquid co2? Posted: 17 Sep 2017 06:33 PM PDT I know this can only exist under considerable pressure, but I'm curious and can't seem to find an answer. submitted by /u/_BitMason [link] [comments]

Why does tidal acceleration happen sattelites that orbit a oceanless planet? Posted: 18 Sep 2017 06:30 AM PDT I have to write a superficial essay about to moon, but went down the rabbithole of wikipedia articles and I got stuck with a question.   In a wikipedia article regarding Tidal acceleration, they claim that the acceleration is present between all prograde natural sattelites and their primary, but the explanation provided for the earth-moon system relies on the mass deplacement from the oceans, which create a torque that slows down the earth and moves the moon away.   How does this happen on satellites that orbit a primary that does not have liquid water, the article states that in most cases tidal acceleration is neglible, and not comparable to the earth moon situation, but I was wondering how the effect even happens in those systems?   Is it simply because the center of mass of the planet is not on the rotational axis? Or is there some different proces? submitted by /u/yousoc [link] [comments]

Would mechanically moving electrons create a super-strong magnetic field? Posted: 17 Sep 2017 06:24 PM PDT According to this Veritasium video, the magnetic field in a wire with a non-zero current is an artifact of special relativity. A moving charge sees a speed difference between the wire and the electrons in it (since the electrons are moving). Due to Lorentz contraction there appears to be a net positive charge and a repelling force arises. The physical speed of electrons supporting a current is very slow, a few micrometers per seconds, but due to the number of electrons and the strength of the electric field the effect is macroscopic. What if you could mechanically increase this speed? Say you had a charged capacitor, and one of the plates was given a parallel velocity. E.g. two concentric cylinders with a charge imbalance, with one of them attached to a motor. Wouldn't that create a very strong apparent magnetic field? submitted by /u/skydivingdutch [link] [comments]

What are the physiological mechanisms through which "sonic weapons" could cause symptoms such as traumatic brain injury? Posted: 17 Sep 2017 01:47 PM PDT I was curious when hearing about the alleged "sonic attack" at the American embassy in Cuba. I was wondering what the exact mechanism might be through which a localized sound wave can cause such effects. What is known about this subject? submitted by /u/HugodeGroot [link] [comments]

My Uncle was just diagnosed with Creutzfeldt-Jakob disease (CJD), a prion disease. What makes these disorders so hard, to impossible to treat? Posted: 17 Sep 2017 05:54 PM PDT My uncle has been given less than 6 months to live. Our family is in utter shock at the moment. I have been doing a lot of reading, and I understand brain diseases are always problematic because of the brain-blood barrier. But what else makes prion diseases so hard to treat. Also, does anyone know of any experimental treatments? Thank you. submitted by /u/KitKatBarMan [link] [comments]

What would happen if only your arm and nothing else was exposed to a vacuum? Posted: 17 Sep 2017 07:37 PM PDT Let's assume you had a vacuum chamber with a hole somewhere in the wall you put your arm through which sealed it perfectly submitted by /u/Raknarg [link] [comments]

What makes you feel 'full' ? Posted: 17 Sep 2017 05:25 PM PDT I was wondering, when you feel full, as in you don't want to eat anymore, is it the volume of the food that makes you feel this way, or is it the caloric content? submitted by /u/notadi [link] [comments]

Can organ transplant recipients be organ donors? Posted: 17 Sep 2017 07:19 PM PDT Let's say you receive a heart transplant. You live a full life and die by some other means than heart related issues. Is that heart eligible to be donated again? submitted by /u/letsjustgoalready [link] [comments]

Why is it when I drink something really sour my cheek muscles tighten? Posted: 17 Sep 2017 03:57 PM PDT submitted by /u/WJCIII [link] [comments]

Why is it bad to shampoo my hair everyday? Posted: 17 Sep 2017 11:38 AM PDT I've heard that its bad for your hair but I'd like to know the science behind it. submitted by /u/CaptainTerror [link] [comments]

[Chemistry] How do you know how many isotopes of atom exist? Posted: 17 Sep 2017 08:00 PM PDT I'm trying to understand. I know that an an element is determined by the protons in it's nucleus. If Hydrogen gains a proton then it is now Helium. But how do you know how many isotopes there can be? Carbon 12 has 6p and 6n, but could I go as low as having 6 protons and 1 neutron or is that not possible and is it something that I will just have to memorize? submitted by /u/YearnsForStarfleet [link] [comments]

How does the distance between subatomic particles work? Posted: 17 Sep 2017 12:55 PM PDT From what I understand the strong force acts between about 0.8 to 3fm. I'm trying to understand the distance between protons/neurons in a nucleus and between quarks within a nucleon, and how they relate to each other. I've read that the distance between quarks is approximately 0.8fm and the distance between nucleons is approximately the range of the strong force. This suggests that the protons overlap and have a pretty undefined size. Is it right to assume that a nucleus is more like a cloud of quarks that don't have a set distance or any distinct bounds? Having seen diagrams of nucleons being a sort of bubble containing 3 quarks at a set distance and nucleuses being a little collection of multicoloured spheres my whole life has lead me to a lot of confusion about this topic... submitted by /u/Ambidextroid [link] [comments]

Why is Jupiters surface/atmosphere so volatile? Posted: 17 Sep 2017 11:49 AM PDT Just saw the new Juno image of Jupiters South Pole and all the storms that are up to 1000km across. How or why is the surface/atmosphere in such chaos, bringing to mind the "red spot" which has been raging for hundreds of years. What also makes these storms last for so long and why are the colours of the storms so different? Cheers! submitted by /u/xxKoolAid [link] [comments]

Why are the hands facing forward in anatomical position? Posted: 17 Sep 2017 06:07 PM PDT Twisting the hands outwards causes stress in the forearm. Wouldn't it be easier to examine a body that is under as little stress as possible? submitted by /u/JustAnotherMe23 [link] [comments]

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