What happens in the brain in the moments following the transition between trying to fall asleep and actually sleeping?

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• What happens in the brain in the moments following the transition between trying to fall asleep and actually sleeping?
• Are film clips still "moving pictures" when recorded and stored digitally, or does the recording of a digital video work differently from analogue recording?
• For those with ASD, can people move along the spectrum as they age? Can people become higher- or lower-functioning as time goes on, and if so, which has been seen to be more common?
• Do any non-human species exhibit the concept of familial inheritance of either property or position?
• I’ve heard some cosmologists say the universe may be infinite. How can this be if there has not been an infinite amount of time since the Big Bang?
• It is very windy in LA right now, and while driving, my cars radio is extremely staticky, my question is, do heavy winds cause radio stations to have weaker signals?
• Does drilling into deep Antarctic lakes (or any isolated environment) present an elevated risk of reintroducing a disease to existing environments? Do the people doing this work need to take precautions beyond what is usually required with sampling any other environment?
• Equivalent of Witt's theorem but for over-complete sets of vectors?
• Are neutrons evenly distributed inside a nucleus, or is there a density gradient?
• When your heart "skips a beat" - does it?
• Why is it (n) and not (the square root of n) in the variance formula?
• Does the loudness and/or frequency of a sound change its speed of travel?
• Is Earth extremely rare to have a perfect Solar Eclipse and Lunar Eclipse?
• Why does the moon appear red during a lunar eclipse and dark during a new moon? Does the moon also appear red during a solar eclipse?
• How does THC affect blood circulation?
• Can you perform the double slit experiment with VLF radio waves, would the slits and detector wall need to be huge?
• Is it possible to determine the location where an image was taken using spherical geometry? How?
• When dogs detect cancer in humans, how do they know that it’s a bad thing?
• How come sodium (Na) and Potassium (K) have such different equilibrium potentials within a neuron, but they're very similar atoms?
• What is the most efficient way to cross out a Barcode?
• How does white vinegar neutralise odors?

What happens in the brain in the moments following the transition between trying to fall asleep and actually sleeping? Posted: 22 Jan 2019 03:53 AM PST submitted by /u/Riftus [link] [comments]

Are film clips still "moving pictures" when recorded and stored digitally, or does the recording of a digital video work differently from analogue recording? Posted: 22 Jan 2019 06:52 AM PST I put computing as flair, but I'm honestly not sure in which category this belongs. Feel free to mark it with more appropriate flair, admins. submitted by /u/Choral [link] [comments]

For those with ASD, can people move along the spectrum as they age? Can people become higher- or lower-functioning as time goes on, and if so, which has been seen to be more common? Posted: 22 Jan 2019 07:21 AM PST submitted by /u/Throwaway565463 [link] [comments]

Do any non-human species exhibit the concept of familial inheritance of either property or position? Posted: 22 Jan 2019 05:40 AM PST Several non-human species (e.g. certain birds, rats, and primates) seem to have a sense of property. Many species have hierarchical social structures, in which certain individuals are considered dominant or superior to others. Are there any species in which the offspring of a deceased individual "inherit" either their property or their social position? Or does such property merely become "fair game," and social position is rearranged to promote the next individual in the "pecking order," regardless of genetic lineage? In other words, is familial "inheritance" of property or position an entirely human construct? submitted by /u/im_mobile [link] [comments]

I’ve heard some cosmologists say the universe may be infinite. How can this be if there has not been an infinite amount of time since the Big Bang? Posted: 22 Jan 2019 05:51 AM PST submitted by /u/tbone985 [link] [comments]

It is very windy in LA right now, and while driving, my cars radio is extremely staticky, my question is, do heavy winds cause radio stations to have weaker signals? Posted: 22 Jan 2019 07:16 AM PST submitted by /u/ALostPaperBag [link] [comments]

Does drilling into deep Antarctic lakes (or any isolated environment) present an elevated risk of reintroducing a disease to existing environments? Do the people doing this work need to take precautions beyond what is usually required with sampling any other environment? Posted: 22 Jan 2019 01:23 AM PST I read recently about the samples taken from the very deep lake in the Antarctic. I often hear about diseases being devestating to isolated populations. I'm curious whether this can work in reverse. Do long isolated habitats represent a hazard to the biosphere at large? I don't mean to be in any way alarmist. I am just genuinely curious whether work like this carries any exotic hazards, or if a sample of lake water from under a kilometer of ice is just another sample of lake water. submitted by /u/Wobbles42 [link] [comments]

Equivalent of Witt's theorem but for over-complete sets of vectors? Posted: 22 Jan 2019 06:29 AM PST Hi! I've been trying to prove this or find a counter-example but with no success yet, I also started going over the literature but I couldn't quite tell if the results I found there would be useful for me or not. So thanks for any help or any useful references! Here's my scenario: I have a d-dimensional vector space X over a finite field of odd characteristic, it's equipped with a symmetric bilinear form B( - , - ). I have two sets of n vectors each: V={v_1, ..., v_n} and U={u_1, ..., u_n} where n>d, where dim( span V ) = dim( span U ) < d, and these vectors satisfy that B( v_i , v_j ) = B( u_i, u_j). Can I say that there is a linear transformation L which preserves B( , ) such that L u_i = v_i for all i? ​ This would be an extension of Witt's theorem but for over-complete sets of vectors. Thanks so much in advance! submitted by /u/fuckwatergivemewine [link] [comments]

Are neutrons evenly distributed inside a nucleus, or is there a density gradient? Posted: 21 Jan 2019 05:37 PM PST submitted by /u/Thrownawaybyall [link] [comments]

When your heart "skips a beat" - does it? Posted: 21 Jan 2019 01:43 PM PST What is happening when your heart "skips a beat"? submitted by /u/Gaymface [link] [comments]

Why is it (n) and not (the square root of n) in the variance formula? Posted: 22 Jan 2019 07:08 AM PST From my understanding, the variance is the squared average differences from x-bar (the mean). I also understand that the reason quantities are squared in the numerator is for a mathematical reason, not a statistical one, that is to avoid any possible negative values. My question is, why isn't the formula: the summation of squared differences over n2 instead of n? I feel that it is unproportional to divide a quantity squared by unsquared sample size. In other words, it perhaps seems like a distortion. Another way to look at it is that in standard deviation when we take the square root of the numerator we revert the quantities to their initial units, yet we also take the square root of (n) which, again, changes its meaningful representation as the sample size, thus unproportional again. Can someone kindly explain why is that? submitted by /u/AhmedFakeih [link] [comments]

Does the loudness and/or frequency of a sound change its speed of travel? Posted: 22 Jan 2019 03:00 AM PST I know the medium changes its speed, like the difference between speed through air and speed through water, but does the loudness or frequency change anything in regards of speed? submitted by /u/Hammerang [link] [comments]

Is Earth extremely rare to have a perfect Solar Eclipse and Lunar Eclipse? Posted: 21 Jan 2019 04:55 PM PST What are the chances that the size of a planet is just perfect enough to eclipse it's moon just right, and the size of the moon (relative to that planet) is just right to eclipse it's sun resulting in perfect eclipses? I am not advocating for creationism or "intelligent design", but am actually genuinely curious. Thank you! submitted by /u/cinemojo [link] [comments]

Why does the moon appear red during a lunar eclipse and dark during a new moon? Does the moon also appear red during a solar eclipse? Posted: 21 Jan 2019 07:34 PM PST submitted by /u/Sirteen [link] [comments]

How does THC affect blood circulation? Posted: 21 Jan 2019 04:35 PM PST Hello, /askscience! I've always wondered why THC caused red eyes and blushy face. I know the endocannabinoid system has an effect over peripheral circulation, but I can't find any article that says how. The only good thing explained that i can find is how THC causes its mental effects, which is through binding with GABA producing neurons which regulate a great lot of neurons (as dopamine and serotonin producing neurons, thought processing neurons and such). I can't either find how does it affect saliva production, intraocular pressure and heart rate, but I guess those are another question haha. What do you know about this? submitted by /u/pawroulette [link] [comments]

Can you perform the double slit experiment with VLF radio waves, would the slits and detector wall need to be huge? Posted: 21 Jan 2019 09:02 PM PST submitted by /u/BearItChooChoo [link] [comments]

Is it possible to determine the location where an image was taken using spherical geometry? How? Posted: 22 Jan 2019 12:23 AM PST Is it possible to find out where a image was taken only knowing the time it was taken, object height and shadow height? I wondered because there was a scene in the movie "G.I. Joe" where the good guys found the villain's secret base only having a picture of him standing in sun light. submitted by /u/blackhawk1819 [link] [comments]

When dogs detect cancer in humans, how do they know that it’s a bad thing? Posted: 22 Jan 2019 03:06 AM PST submitted by /u/meoe [link] [comments]

How come sodium (Na) and Potassium (K) have such different equilibrium potentials within a neuron, but they're very similar atoms? Posted: 21 Jan 2019 08:50 PM PST This could apply to any cell, not just neurons. I've gone my whole life just accepting that potassium likes to go out of cells and sodium likes to go into cells, but never really understood why. Potassium has an equilibrium potential at - 90 mV in a resting neuron, but sodium has one at + 60 mV. submitted by /u/SaneImpala [link] [comments]

What is the most efficient way to cross out a Barcode? Posted: 22 Jan 2019 01:07 AM PST How can I invalidate a barcode with just a black ballpen with the minimum amount of strokes? Perpendicular/diagonal/parallel lines? Is the position relevant? And why is it (not)? submitted by /u/maxop001 [link] [comments]

How does white vinegar neutralise odors? Posted: 22 Jan 2019 12:19 AM PST submitted by /u/oj109 [link] [comments]

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Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States

The moon rotates around its own axis at the same speed as its rotation around earth, which is why we don't see the "dark side". Is this purely coincidental or not?

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• The moon rotates around its own axis at the same speed as its rotation around earth, which is why we don't see the "dark side". Is this purely coincidental or not?
• If we could travel at 99.9% the speed of light, it would take 4 years to get to Alpha Centauri. Would the people on the spaceship feel like they were stuck on board for 4 years or would it feel shorter for them?
• What determines the speed of sound? Why is it not equal to the average speed of a particle in the given medium?
• Do electrons/energy build up at the entrance to the resistor?
• During warm periods in Earth's history (like the PETM or the Cretaceous), how much hotter were the temperature extremes as compared to today (which is around 56C)?
• Why was nuclear power originally researched?
• If you travel at 99,99% the speed of light, what happens to your cells while time appears to slow down?
• With underground nuclear explosions that create large craters with no above-ground material ejection, how is the cavity for the crater formed?
• How do we find the distance between the Earth and stars?
• What evidence is there that photons actually exist, as a particle?
• Do octopuses have dominant tentacles like people have dominant hands?
• How do you "catch a cold"?
• Is our atmosphere rotating with earth or is it stationary?
• How difficult would it be to drill into the Earth's Mantle, and what would we expect to find there?
• [Physics] If each particle is made up of 2,3,4 or 5 quarks and anti-quarks, Does that mean a particle of 12 quarks would be possible?
• On a particle level, what explains blackbody radiation?
• Is it possible that the space is also quantized?
• Do animals in the ocean have to worry about diseases as much as humans or animals on land?
• Any Jupiter experts out there?
• Are galaxies who are near one another or are neighbors, all around the same age?

The moon rotates around its own axis at the same speed as its rotation around earth, which is why we don't see the "dark side". Is this purely coincidental or not? Posted: 21 Jan 2019 06:41 AM PST I'm sure there's a logical explanation I'm not seeing, or is my interpretationof "dark side wrong? submitted by /u/ColonConoisseur [link] [comments]

If we could travel at 99.9% the speed of light, it would take 4 years to get to Alpha Centauri. Would the people on the spaceship feel like they were stuck on board for 4 years or would it feel shorter for them? Posted: 20 Jan 2019 06:57 AM PST submitted by /u/GPL89 [link] [comments]

What determines the speed of sound? Why is it not equal to the average speed of a particle in the given medium? Posted: 21 Jan 2019 06:51 AM PST Today I learned, that the average speed of gas molecules in the air is around 500 m/s (at a temperature of about 30° C). I thought soundwaves are particles bumping into each other progressively. This seems to be wrong of course... But what does determine the speed of sound, if not the average speed of the particles themselves? submitted by /u/Loenen [link] [comments]

Do electrons/energy build up at the entrance to the resistor? Posted: 21 Jan 2019 06:48 AM PST I know a resistor limits the amount of current that flows in a circuit, but does this cause a buildup of electrons, heat, or energy at the entrance of the resistor? submitted by /u/dtrickX [link] [comments]

During warm periods in Earth's history (like the PETM or the Cretaceous), how much hotter were the temperature extremes as compared to today (which is around 56C)? Posted: 20 Jan 2019 07:48 PM PST submitted by /u/xystonulexx [link] [comments]

Why was nuclear power originally researched? Posted: 21 Jan 2019 01:31 AM PST What was the original purpose for studying nuclear energy or nuclear fission? Was it to help man-kind originally, or was researched to create a new weapon? I am just trying to understand the historical purpose of nuclear energy and what the scientists had in mind when originally researching it. submitted by /u/mrbig1337 [link] [comments]

If you travel at 99,99% the speed of light, what happens to your cells while time appears to slow down? Posted: 20 Jan 2019 11:22 PM PST I am torn appart between the physics or biology tag... Let's say you travel at the speed of Light (close to it atleast) and it takes you 1 year in earth time. do your bodycells also slow down aging? Let's say a 90 year old cancer Patient wants to see his grandchildren graduate or marry, would he be able to slow down his cancer by going on a trip? submitted by /u/xFreakout [link] [comments]

With underground nuclear explosions that create large craters with no above-ground material ejection, how is the cavity for the crater formed? Posted: 20 Jan 2019 07:48 PM PST This was posted in another sub: http://i.imgur.com/wMOy7fz.gifv It seems as if the explosion is entirely contained underground, and a large cavity is created that collapses with little/no ejection of material. What causes this? Compaction of surrounding earth? Something about melting/vaporization? Unseen material ejection? submitted by /u/Hatsuwr [link] [comments]

How do we find the distance between the Earth and stars? Posted: 20 Jan 2019 11:00 PM PST We know Proxima Centauri is 4.2 light years away. We know Sirius is 8.6 light years away. How do we find and calculate these distances? submitted by /u/YashBarge [link] [comments]

What evidence is there that photons actually exist, as a particle? Posted: 21 Jan 2019 06:14 AM PST I've been thinking a lot about the electromagnetic spectrum and light lately, and I am having the damnedest of a time believing that there is an elementary particle called a photon. I can believe there is quantization of electromagnetic radiation at some hf. But this is just a fragment of a cycle of a wave - not a particle, just a short pulse of energy. And goes to the wave theory of electromagnetic radiation. Is this all that a photon is supposed to be? Is it a common lie told by physics teachers that photons are particles? Like how you were lied to when you learned that newtons laws guided everything,and then they told you later about Einstein's theories. A small lie to help you get started to understand what is going on before they hit you with the big math? Or is there indeed some irrefutable physical evidence of a truly massless chargeless particle called the photon? submitted by /u/AllenKll [link] [comments]

Do octopuses have dominant tentacles like people have dominant hands? Posted: 20 Jan 2019 04:00 PM PST Like, they always grab clams with that specific tentacle, or maybe it's a set of tentacles, like 4 of them are really good at everything and the other 4 are just there waiting to be useful. submitted by /u/Frigorifico [link] [comments]

How do you "catch a cold"? Posted: 21 Jan 2019 04:45 AM PST Like, why do you tend to fall sick if the weather is cold and you don't keep yourself warm enough? How do you explain it biologically? Wouldn't pathogens be less active in a cold environment? submitted by /u/marukori [link] [comments]

Is our atmosphere rotating with earth or is it stationary? Posted: 20 Jan 2019 05:58 PM PST submitted by /u/ReaIEIonMusk [link] [comments]

How difficult would it be to drill into the Earth's Mantle, and what would we expect to find there? Posted: 20 Jan 2019 02:24 PM PST I know the deepest hole ever drilled is something like 12km deep - the Kola Superdeep Borehole. But, with today's technology - is it possible (doesn't matter if financially viable) to drill into the Mantle? How would we know when we hit the Mantle, and would we find minerals previously undiscovered? submitted by /u/Contra_Bombarde [link] [comments]

[Physics] If each particle is made up of 2,3,4 or 5 quarks and anti-quarks, Does that mean a particle of 12 quarks would be possible? Posted: 20 Jan 2019 01:20 PM PST submitted by /u/pizayumyum [link] [comments]

On a particle level, what explains blackbody radiation? Posted: 20 Jan 2019 06:57 PM PST Temperature is just a measure of the system's total kinetic energy, which is related to the particles' speed. Why moving particles spontaneously emit photons, and what causes fast moving particles to emit at higher frequency? The distribution of the spectra is probably due to the statistical distribution of particle speeds, but please correct me if I'm wrong. For simplicity, you can consider the material to be a gas. submitted by /u/FRLara [link] [comments]

Is it possible that the space is also quantized? Posted: 20 Jan 2019 12:26 PM PST submitted by /u/noidontknowhy [link] [comments]

Do animals in the ocean have to worry about diseases as much as humans or animals on land? Posted: 20 Jan 2019 12:10 PM PST submitted by /u/numberfourdad [link] [comments]

Any Jupiter experts out there? Posted: 20 Jan 2019 09:55 AM PST What exactly is the "core" of gaseous planets made of? And how does that impact gravity of such planets? Do things just get denser and more compact? Is there a surface? And what's the latest understanding of that massive storm? I am mesmerized by its beauty but I don't understand its composition and formation. How did gasses coalesce in such a way? submitted by /u/Pie_fi [link] [comments]

Are galaxies who are near one another or are neighbors, all around the same age? Posted: 20 Jan 2019 06:55 AM PST Let's take the milky way for example. Are all galaxies near the milky way or in this area of space more or less of the same age? submitted by /u/SirHovaOfBrooklyn [link] [comments]

You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now.	Email delivery powered by Google
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Newtons second law of gravity and coulomb's law for electricity are almost the same. Why can electricity attract and repel, while gravity can only attract? Are we confident gravity doesnt repel anywhere in the universe?

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• Newtons second law of gravity and coulomb's law for electricity are almost the same. Why can electricity attract and repel, while gravity can only attract? Are we confident gravity doesnt repel anywhere in the universe?
• This is a thought experiment, but assuming the absence of nuclear fusion, is it possible for a star to be formed entirely from hydrogen? Would the star survive?
• What is the molecular level description/justification of the Bernoulli Principle?
• Why can’t you consume alcohol while on antibiotics?
• How is Kosher salt different from regular non-iodized salt other than crystal size?
• Why does spicy food make your nose run?
• If you were watching Earth from 100 million light years (or any other number) away, would you see a "livestream" of what happened in the past?
• If you fell into a black hole, wouldn't you cook you due to severely blue-shifted light?
• Will the Hyperloop see sonic booms?
• Why does heating up a magnet remove its magnetic pull?
• If only around 2% of our DNA codes for proteins, what is the function of the other 98% of our DNA?
• Are circumference lengths always an irrational number?
• Where or how do medical professionals get adrenaline for usage?
• How did scientists first determine the molar masses of different substances?
• What's the deal with these colour scales used in full sky temperature maps?
• When looking at an LED display, I can get it to do a Mexican wave by humming. Different pitches of hum cause the oscillation to speed up or slow down in frequency. No one else I know has ever been able to do this and people think I am mad. Has anyone else noticed this, and why might it happen?
• What is the smallest neutron bomb possible, and what would be the efficacy of such a targeted blast radius?
• How do the hairs on my arms, chest and legs know how long they are and to stop growing?
• If there are millions of asteroids entering Earth's atmosphere every day, and there quite a few man-made satellites orbiting Earth including the International Space Station, how is it possible they are not destroyed?
• How do heat-shrinking plastics work?
• Why is that heavy snow sometimes doesnt stick to the ground and build up and other times it does?
• What would the ramifications have been had Tsar Bomba been an underground test?

Newtons second law of gravity and coulomb's law for electricity are almost the same. Why can electricity attract and repel, while gravity can only attract? Are we confident gravity doesnt repel anywhere in the universe? Posted: 19 Jan 2019 06:09 PM PST submitted by /u/jcm0265 [link] [comments]

This is a thought experiment, but assuming the absence of nuclear fusion, is it possible for a star to be formed entirely from hydrogen? Would the star survive? Posted: 20 Jan 2019 02:01 AM PST submitted by /u/Terri23 [link] [comments]

What is the molecular level description/justification of the Bernoulli Principle? Posted: 20 Jan 2019 05:23 AM PST The below shouldn't be necessary to answering the title question, but will help with understanding where I'm coming from and what I mean. Feel free to skip over it. At university, I studied Chemical Engineering i.e. a lot of fluid flow. My desire to understand things at fundamental levels didn't always go hand-in-hand with the teaching nor the typical engineering mindsets, so I was never fully satisfied with some of the descriptions of reality that were offered. The unsatisfying description in question here is the Bernoulli Principle. I don't have a fluid dynamics textbook to hand, so I'm gonna go with Wikipedia here for the principle's definition with regards to just fluid velocity and fluid pressure: "...an increase in the speed of a fluid occurs simultaneously with a decrease in pressure..." I'm not denying that this happens under certain conditions, but it seems this statement doesn't apply to all conditions. For example, a water truck's water (presumably) has the same pressure when travelling at constant velocity of 40mph vs 60mph (it feels very counter intuitive to imagine there being some truck speed where the water pressure would drop to the water's vapour pressure and cause it to boil). We know that the principle does apply in the case of pipe fluid flow, for example in a venturimeter. So, what's the fundamental difference here vs the water truck example? Why does that difference lead to the difference in pressure behaviour, despite both being instances of changes in fluid velocity? I'm not denying the veracity of the first law of thermodynamics when I say this, and I realise that the Bernoulli equation is essentially an energy balance, but I don't think "it's because of the energy conservation on/within the fluid" is actually an answer to what is fundamentally happening and doesn't address the difference. Rather, that statement serves as more of a heuristic that allows us to easily figure out the state of the system. But, the universe doesn't just adjust the pressure when the velocity increases so that the total energy change is zero, instead there are other processes at play, the net/emergent/observable result of which is that the total energy change is zero. This result is more convenient to work with in most instances, but doesn't necessarily allow you to work backwards to what actually took place "behind the scenes", which is what I'm wanting to do here. To understand why we observe the pressure dropping when the velocity increases in some cases and not in others, I think a Kinetic Theory style molecule level description of fluid pressure needs to be applied. If we could perfectly describe a fluid as a system of individual molecules that interact with one another according to their individual molecular properties and states, and simulate it according to Newton's laws of motion, I imagine you would see the Venturi effect/Bernoulli principle emerge in certain cases without even needing to explicitly program that behaviour into the simulation. So... What is the molecular explanation of the Bernoulli Principle? submitted by /u/Craigy100 [link] [comments]

Why can’t you consume alcohol while on antibiotics? Posted: 19 Jan 2019 07:42 PM PST submitted by /u/pgh77 [link] [comments]

How is Kosher salt different from regular non-iodized salt other than crystal size? Posted: 19 Jan 2019 07:05 PM PST This is really more of a food science question but I feel chemistry is the right tag since a 'food science' flair doesn't exist. Are there other trace metals that lower the sodium content like Himalayan salt? Or am I missing the reason people pay more money for a larger, less refined crystal of the same chemical composition (it's not like they're diamonds) submitted by /u/MattyMattsReddit [link] [comments]

Why does spicy food make your nose run? Posted: 19 Jan 2019 06:06 PM PST submitted by /u/outofideasforusernam [link] [comments]

If you were watching Earth from 100 million light years (or any other number) away, would you see a "livestream" of what happened in the past? Posted: 20 Jan 2019 07:09 AM PST Perhaps my question isn't entirely clear so let me explain my thought. If light takes 100 million years to travel to a distant location, the person watching Earth from that point (assuming they have some sort of super hi-tech telescope) would see what happened 100 million years ago. But it's not just one moment of light that travels the distance, but a sequence of light, a new picture with every second so to speak. So would a person from afar actually see what happened here 100 million years ago sort of like in a video? submitted by /u/tijuanatitti5 [link] [comments]

If you fell into a black hole, wouldn't you cook you due to severely blue-shifted light? Posted: 20 Jan 2019 04:18 AM PST This is assuming, of course that you're falling into a black hole big enough that the tidal forces aren't ripping you apart as well. submitted by /u/Ycarusbog [link] [comments]

Will the Hyperloop see sonic booms? Posted: 20 Jan 2019 02:47 AM PST Since the Hyperloop concept is to operate high speed trains in a near-vacuum tunnel, I was wondering if they can reach the speed of sound and if it can, will there be a sonic boom? submitted by /u/mistborn101 [link] [comments]

Why does heating up a magnet remove its magnetic pull? Posted: 19 Jan 2019 04:42 PM PST I just watched a video by The King of Random, in which he heated a powerful neodymium magnet to about 1800° and checked to see if it still attracted metal, which it did not. He also tried heating the metal instead of the magnet, with the same result. The metal, once it cooled down, started attracting to magnets again. But the magnet, even cooled back to room temperature, did not attract metal anymore. It had permanently lost its magnetism. My question is: Why? Why did heat affect the magnetism, and why did the metal regain it's ability to be attracted to magnets, but the magnet lost its properties permanently? submitted by /u/Roundtable_Rival [link] [comments]

If only around 2% of our DNA codes for proteins, what is the function of the other 98% of our DNA? Posted: 19 Jan 2019 07:42 PM PST submitted by /u/feedman223 [link] [comments]

Are circumference lengths always an irrational number? Posted: 20 Jan 2019 04:33 AM PST If π is an irrational number, and thus cannot be represented as a fraction, and the circumference length c = 2πr, then π = c/2r, which is a fraction representation. Does this mean that a circumference length is always irrational as well? submitted by /u/vapocalypse52 [link] [comments]

Where or how do medical professionals get adrenaline for usage? Posted: 19 Jan 2019 05:27 PM PST submitted by /u/Airican [link] [comments]

How did scientists first determine the molar masses of different substances? Posted: 19 Jan 2019 02:10 PM PST To elaborate a bit on my question: when for example it was first discovered that the molar mass of water was roughly 18.015g/mol, how did they know for sure that they at that time were weighing the exact amount of water molecules that go into 1 mole? Or in case they calculated it from a smaller sample of particles where they knew the exact amount of particles and what they weighed, how did they determine exactly how many particles were in the sample? More generally I guess I'm asking is, how do you determine the exact amount of particles of any substance that you have in a container at a given point? I hope I phrased this somewhat understandably and not too convoluted. I wasn't sure how to put it in different words. submitted by /u/Bawrosaurus [link] [comments]

What's the deal with these colour scales used in full sky temperature maps? Posted: 20 Jan 2019 01:11 AM PST Reading about the cosmic microwave background I stumbled upon these full sky temperature maps and the first thing that confused me is the scaling scheme. How to use the same colour (white) two times on the same colour scale? https://imgur.com/a/9K5xkZd Source: https://arxiv.org/abs/1807.06205, page 4: "Fig. 1. Fluctuations of the sky emission in each of the nine Planck frequency bands, after removal of a common dipole component. The fluctuations are expressed as equivalent temperature variations at each of the seven lowest frequencies, so that fluctuations with a thermal spectrum will appear the same in each map (except for the effects of the varying resolution of the maps). The highest frequencies, which monitor the dust emission, are expressed in more conventional units." submitted by /u/zetastratus [link] [comments]

When looking at an LED display, I can get it to do a Mexican wave by humming. Different pitches of hum cause the oscillation to speed up or slow down in frequency. No one else I know has ever been able to do this and people think I am mad. Has anyone else noticed this, and why might it happen? Posted: 19 Jan 2019 08:53 AM PST Clarification- the oscillation is only visible in my eyes, I cannot physically effect the display itself! submitted by /u/HerbziKal [link] [comments]

What is the smallest neutron bomb possible, and what would be the efficacy of such a targeted blast radius? Posted: 19 Jan 2019 10:58 AM PST submitted by /u/FrozenCaveMoose [link] [comments]

How do the hairs on my arms, chest and legs know how long they are and to stop growing? Posted: 19 Jan 2019 10:55 AM PST If i shave them off, they instantly start growing back, so they must have some idea of how long they are. What's going on? submitted by /u/fizdup [link] [comments]

If there are millions of asteroids entering Earth's atmosphere every day, and there quite a few man-made satellites orbiting Earth including the International Space Station, how is it possible they are not destroyed? Posted: 19 Jan 2019 09:53 PM PST I also wanted to add that since the Moon is peppered with craters, I would think that the chances of asteroids hitting anything we send into space is high, what is your thought? submitted by /u/Banditteer [link] [comments]

How do heat-shrinking plastics work? Posted: 19 Jan 2019 06:03 PM PST If heat makes substances expand at a molecular level and cold makes substances contract, how do heat-shrinking plastics work? I know that water expands as it freezes into ice because of the organization of the molecules into a crystalline structure, but I'm sure it isn't the same mechanism in reverse. (Maybe I'm wrong?) TIA! submitted by /u/Kokopelli615 [link] [comments]

Why is that heavy snow sometimes doesnt stick to the ground and build up and other times it does? Posted: 19 Jan 2019 03:10 PM PST submitted by /u/badlyoff93 [link] [comments]

What would the ramifications have been had Tsar Bomba been an underground test? Posted: 19 Jan 2019 11:23 AM PST So the Soviets designed the largest bomb possible (100 Mt), then cut it in half, then detonated the largest bomb ever detonated (50 Mt) in the atmosphere. What would have happened to the planet had the Soviets buried the bomb in the Earth's crust? Could it have penetrated all the way through the crust? What would life look like on the planet had they done this, whether with the 50 or the 100 megaton model? submitted by /u/MississippiJoel [link] [comments]

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