Are some 3D curves (such as paraboloids, spheres, etc.) 3D "sections" of 4D "cones", the way 2D curves (parabolas, circles, etc.) are sections of 3D cones?

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• Are some 3D curves (such as paraboloids, spheres, etc.) 3D "sections" of 4D "cones", the way 2D curves (parabolas, circles, etc.) are sections of 3D cones?
• How do the lasers that remove rust work?
• Why is Theobromine named Theobromine when it contains no Bromine?
• If we were to magnify to an almost molecular level the edge of a circle, would we reach a point when it is completely straight?
• Why are bubbles spheres and no other shapes?
• Up to what Richter value is linear elasticity still applicable to soil?
• Is there any essential difference between ignition by flame/spark and autoignition?
• Do people in cultures where the traditional music is in semi-tonal (non-western music) have perfect pitch to semi-tonal scales?
• What ranges of the EM spectrum are we currently unable to produce a light source for?
• Is there a conservation law associated with CPT symmetry? Shouldn't it be conservation of probability?
• How long would a 100km^3 block of butter power humanity?
• Are neurotransmitters hormones?
• What if you cut the Planck length in half? Does physics break down at that point?
• Why can't dark matter just be neutrinos?
• As Per Special Theory of Relativity, Length Contracts and Time Dilates. Does Length Contract in All Three Dimensions?
• [Math][Physics]How can the Many-World Interpretation make meaningful statements about probability when infinity is involved?
• X-ray Crystallography - What do the extra peaks on Patterson maps refer to/ Where are they from?
• How much energy is produced (converted) to useable energy in a particle collision? i.e. how to calculate available/useable energy to create new particles?
• Why do waves diffract at all?
• Why did nucleosynthesis in the early universe allow neutrons to merge quickly with protons, but not allow protons to merge with each other?
• If I throw an object while standing on the ground, is the object's path (assuming vaccuum) truly parabolic or is it elliptical around the center of the earth like an orbit?

Are some 3D curves (such as paraboloids, spheres, etc.) 3D "sections" of 4D "cones", the way 2D curves (parabolas, circles, etc.) are sections of 3D cones? Posted: 12 Mar 2016 04:33 PM PST submitted by /u/graaahh [link] [comments]

How do the lasers that remove rust work? Posted: 12 Mar 2016 09:58 AM PST submitted by /u/letlightning [link] [comments]

Why is Theobromine named Theobromine when it contains no Bromine? Posted: 12 Mar 2016 09:11 AM PST I was googling around caffeine and other xanthines and noticed the lack of bromine in this molecule, why is it named this? submitted by /u/SplafferZ [link] [comments]

If we were to magnify to an almost molecular level the edge of a circle, would we reach a point when it is completely straight? Posted: 12 Mar 2016 08:34 AM PST Not sure if the question makes a lot of sense since English is not my first language, however what I am trying to ask is: Is there such an area on a circle which is completely straight? submitted by /u/CultuReal [link] [comments]

Why are bubbles spheres and no other shapes? Posted: 12 Mar 2016 06:57 PM PST submitted by /u/Trtlman [link] [comments]

Up to what Richter value is linear elasticity still applicable to soil? Posted: 12 Mar 2016 09:10 AM PST Depending on the size of wave that passes through the earth/soil, you can model the soil's behaviour as linear elastic (at least, that's a decent assumption to make). Does anyone know up to what point this doesn't hold anymore? So when does plasticity become a part of it? Thank you for any answers! I'm interested in knowing the behaviour of soil under earthquake excitation. submitted by /u/mojojojo1717 [link] [comments]

Is there any essential difference between ignition by flame/spark and autoignition? Posted: 12 Mar 2016 09:51 AM PST I knew the difference in practical between them: for normal ignition we need "an external source of ignition, such as a flame or spark" (via Wikipedia), but this requires only a very low temperature (flash point/fire point). On the other hand, for autoignition you only need to heat/compress your fuel (and have oxygen fore sure) to a (much higher) temperature (autoignition temperature), and it will spontaneously ignite. But my question is, what's the essential difference between them, like in microscale? Doesn't that "external source" just heat certain area of your fuel to make it "auto-ignite" like how you heat/compress all your fuel together in autoignition? What will happen if I just shoot 1400F oxygen to your gasoline? Thanks! (I searched previous questions. This one is similar but not the same.) submitted by /u/fireattack [link] [comments]

Do people in cultures where the traditional music is in semi-tonal (non-western music) have perfect pitch to semi-tonal scales? Posted: 12 Mar 2016 09:21 PM PST submitted by /u/Spam4119 [link] [comments]

What ranges of the EM spectrum are we currently unable to produce a light source for? Posted: 12 Mar 2016 05:49 PM PST submitted by /u/kzgrey [link] [comments]

Is there a conservation law associated with CPT symmetry? Shouldn't it be conservation of probability? Posted: 12 Mar 2016 08:37 AM PST I've been reading a lot about symmetry lately and I can't articulate why but I feel like for there to be predictable laws that comes from an ultimately statistical (random) microscopic world, that the conservation of probability must come into play. So my ultimate question is, is there a conservation law associated with CPT symmetry? submitted by /u/_Dobis_PR [link] [comments]

How long would a 100km^3 block of butter power humanity? Posted: 12 Mar 2016 02:20 PM PST How long could a block of butter power our cars and generators, lights and factories etc. for? submitted by /u/4Sken [link] [comments]

Are neurotransmitters hormones? Posted: 13 Mar 2016 06:32 AM PDT submitted by /u/agginae [link] [comments]

What if you cut the Planck length in half? Does physics break down at that point? Posted: 12 Mar 2016 02:54 PM PST submitted by /u/kvdence [link] [comments]

Why can't dark matter just be neutrinos? Posted: 12 Mar 2016 11:58 PM PST It seems like an obvious sort of answer, so there must be a good reason it's not right submitted by /u/chunkylubber54 [link] [comments]

As Per Special Theory of Relativity, Length Contracts and Time Dilates. Does Length Contract in All Three Dimensions? Posted: 13 Mar 2016 04:30 AM PDT submitted by /u/etimejumper [link] [comments]

[Math][Physics]How can the Many-World Interpretation make meaningful statements about probability when infinity is involved? Posted: 12 Mar 2016 02:36 PM PST If we have a barrel containing 5 red apples and 5 green apples, then there's a 50% chance of randomly drawing a red apple from that barrel. But if we have a barrel containing 5 red apples, and infinitely many green apples, it doesn't seem like anything meaningful can be said about the probability of drawing a red apple. I'm curious about how this relates to the Many-Worlds interpretation and Physics overall. So, say we want to describe the probability that something violates Newtonian mechanics. It seems like what Many-Worlds is saying is we just have to compute The number of wave collapses that lead to violation of Newtonian Physics / The number of possible events produced by possible wave collapses. But the number of possible events produced by wave collapses is either infinite or unaccountably large. Another concrete example: A asteroid is on path to hit earth. You want to calculate the probability that it will miraculously violate Newtonian mechanics and change course. There's a simple formula for this The number of wave collapses that could cause the meteor to change course / The number of all wave collapses occurring between now and when the meteor hits We can't calculate this probability because the denominator is either infinite or unaccountably large. But intuitively, we want to say that there is a probability and that it's very low. Furthermore, we would want to say that the probability starts very low and approaches zero as the asteroid approaches earth. I'm confused about how we can make meaningful physical statements at all. Edit, additional example: Let's say there's a 25% chance of an event happening and a 75% chance of it not happening. We would want to say that the event does not happen in more universes than it does. But if we apply this to the Many Worlds theory, 25% of worlds is ∞ worlds. 75% percent is ∞ worlds. So how can we meaningfully say that ∞ < ∞ in this situation? submitted by /u/EWJacobs [link] [comments]

X-ray Crystallography - What do the extra peaks on Patterson maps refer to/ Where are they from? Posted: 13 Mar 2016 04:04 AM PDT http://people.mbi.ucla.edu/sawaya/m230d/Patterson/step4a.gif The image above shows a Harker section from a Patterson map, as far as I understand the major peaks refer to the position of the heavy metal atom. But I am confused as to what the other peaks refer to. I have tried to find reference to what these peaks mean in various text books but to no avail, any help would be appreciated. Thanks submitted by /u/MrTakers [link] [comments]

How much energy is produced (converted) to useable energy in a particle collision? i.e. how to calculate available/useable energy to create new particles? Posted: 12 Mar 2016 05:08 PM PST I'm having trouble understanding how to exactly calculate this quantity (if its a possible/meaningful thing to do at all). Say we have head on proton-proton collision where each has some initial momentum p (where the speeds I'm considering here are highly relativistic). Calculating the kinetic energy of each of these is simple enough, KE = E_total - E_rest = ( (p1*c)2 + (m*c2 )2 )1/2 - m*c2 So after calculating each of these, the total kinetic energy of the system is KE_1 + KE_2 yes? Is this sum of kinetic energies all available to "use"? i.e. to make new particles with? On some level I know that it depends on which particles actually get created, but I'm trying to look at particle collisions in a more general way and find this quantity in a way that is agnostic of what particles are actually produced (again if its possible/meaningful). Would a better way to look at this be to look at the total energies in the collision instead of their kinetic energies? So E_total = ( (p1*c)2 + (m*c2 )2 )1/2 And so the total "available" energy to work with is E_1 + E_2? Ideally here I'm just trying to find the quantity (which is dependent on each of the particles' initial kinetic energy and mass) that represents the sum total of energy (including the rest energies of the protons, i.e. their masses are "useable" since they could conceivably be destroyed in the collision) that could be used to create new particles. I also keep confusing myself with special relativity which I haven't mentioned here because I'm having trouble figuring out if its relevant here to be changing frames etc. Can someone please help me to understand what I'm missing here and how this quantity might be calculated? submitted by /u/el_arens_of_arabia [link] [comments]

Why do waves diffract at all? Posted: 12 Mar 2016 09:40 AM PST submitted by /u/fart_smells_good [link] [comments]

Why did nucleosynthesis in the early universe allow neutrons to merge quickly with protons, but not allow protons to merge with each other? Posted: 12 Mar 2016 08:47 PM PST At the time, was the pressure and temperature too low for this to happen? submitted by /u/Dopcflood [link] [comments]

If I throw an object while standing on the ground, is the object's path (assuming vaccuum) truly parabolic or is it elliptical around the center of the earth like an orbit? Posted: 12 Mar 2016 06:16 PM PST submitted by /u/Nascosto [link] [comments]

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What is the safest speed a human can be accelerated to in a mile?

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• What is the safest speed a human can be accelerated to in a mile?
• If you had a big enough magnet orbit the earth would it produce electricity of some sort?
• Do we know that the speed of light in a vacuum is 3*10^8 m/s, or is that the speed of light in dark matter? Does it make a difference?
• Why do large airplanes retract their landing gear after taking off?
• [Physics] Why doesn't a superconducting wire gain infinite current?
• Amazing tool. Really need to know how it works http://www.youtube.com/watch?v=vTDPI4xTetI
• Is there a general strategy to show a number can be divisible by a square?
• If speed depends of the spacial reference system chosen, wouldn't kinetic energy depends too? If so kinetic energy is defined by the object chosen by the observer?
• How do acid hydrolases survive in the low pH of the lysosome?
• Billions of years ago when the universe was considerably smaller, was matter smaller too? Was there less space separating the electron from nuclei and was the width of a single proton less?
• How does "anti-odor" clothing work?
• If there is a probability of an electron being in an excited state of an atom , and there are an infinite number of excited states, wouldn't the probability of the electron being in the ground state be zero?
• What if photons (light) had mass?
• Where do geese (or other birds) go when the weather bounces (from 25 to 65 degrees) like it has this year?
• How does solid matter stay in the together if it is being spun? Shouldn't relativistic effects tear all matter apart?
• Do migrating birds always align into air currents with the least air resistance?
• Is there an experiment to directly measure the one-way speed of light?
• What has happened when a fetus fails to develop one of its hands or feet? Where has that part of the "blueprint" the cells should be following gone?
• Can Flux pinning happen in a B field and an H Field? If not one of them, why not, and what's the difference between the two?
• Science behind knowing time of death of a loved one?

What is the safest speed a human can be accelerated to in a mile? Posted: 11 Mar 2016 08:08 PM PST I'm just curious as to what speed a vessel could safely reach within a mile without the g force posing a serious threat to its occupant. submitted by /u/MacNamedDre [link] [comments]

If you had a big enough magnet orbit the earth would it produce electricity of some sort? Posted: 12 Mar 2016 02:55 AM PST I was just wondering if this would happen, and if it did could it maybe be a power source for space stations? submitted by /u/NotableFire [link] [comments]

Do we know that the speed of light in a vacuum is 3*10^8 m/s, or is that the speed of light in dark matter? Does it make a difference? Posted: 11 Mar 2016 07:34 PM PST submitted by /u/TheTechSingularity [link] [comments]

Why do large airplanes retract their landing gear after taking off? Posted: 11 Mar 2016 06:43 PM PST Recently there have been a handful of instances in which a plane had to be landed with landing gear that was stuck retracted. I am curious as to whether the benefits outweigh the risks. submitted by /u/metkja [link] [comments]

[Physics] Why doesn't a superconducting wire gain infinite current? Posted: 11 Mar 2016 10:03 PM PST So thanks to V=Blv, the voltage induced in a wire is equal to the magnetic field the wire is moving through, times the length of the wire, times the velocity of said wire. But when combined with I=V/R, a superconducting wire (R=0) should have infinite current! Please explain, thanks in advance! submitted by /u/shadowz749 [link] [comments]

Amazing tool. Really need to know how it works http://www.youtube.com/watch?v=vTDPI4xTetI Posted: 12 Mar 2016 03:55 AM PST What kind of amazing tool is this??? https://www.youtube.com/watch?v=vTDPI4xTetI This was posted on metalworking and laserclean sureddits and noone seems to know! Does anyone know the physics behind it? How much can it worth? submitted by /u/trekkies [link] [comments]

Is there a general strategy to show a number can be divisible by a square? Posted: 11 Mar 2016 06:32 PM PST I was intrigued by a number theory question that was broken down to finding squares that can divide 10n + 1 for any n. I could easily show what n makes it divisible by 112 and that was sufficient for solving the question, but it was too fascinating to stop there. As title suggest, are there more k and n such that k2 | 10n +1? submitted by /u/Sharkunt [link] [comments]

If speed depends of the spacial reference system chosen, wouldn't kinetic energy depends too? If so kinetic energy is defined by the object chosen by the observer? Posted: 11 Mar 2016 09:03 AM PST submitted by /u/relom [link] [comments]

How do acid hydrolases survive in the low pH of the lysosome? Posted: 11 Mar 2016 08:51 AM PST What is it structurally that allows them to function at pH 5? Thanks! submitted by /u/bolgnese [link] [comments]

Billions of years ago when the universe was considerably smaller, was matter smaller too? Was there less space separating the electron from nuclei and was the width of a single proton less? Posted: 11 Mar 2016 08:17 AM PST If this was the case, then is it understood what this might have meant for atomic physics? submitted by /u/Garage_Dragon [link] [comments]

How does "anti-odor" clothing work? Posted: 11 Mar 2016 07:38 AM PST For example, Uniqlo HEATTECH and AIRism is marketed with anti-odor properties. Is it a characteristic of the fabric they use, or is it a chemical? I believe many other brands like Under Armor do similar things. submitted by /u/753UDKM [link] [comments]

If there is a probability of an electron being in an excited state of an atom , and there are an infinite number of excited states, wouldn't the probability of the electron being in the ground state be zero? Posted: 11 Mar 2016 09:13 PM PST Obviously we can find atoms with their electrons in the ground state, so I feel like I am missing a piece of information here or understand something incorrectly. It seems like a paradox since if we take a measurement at room temperature we will find some atoms with electrons in the excited state, but obviously very few even through there are infinite excited states (or are there?) submitted by /u/smallestklein [link] [comments]

What if photons (light) had mass? Posted: 11 Mar 2016 05:46 AM PST submitted by /u/AndyLScott [link] [comments]

Where do geese (or other birds) go when the weather bounces (from 25 to 65 degrees) like it has this year? Posted: 11 Mar 2016 07:36 AM PST I know they fly south and then back up north. The geese here in Indiana seem to have decided to take the cold days off. Then they return on the warmer days. So, this week they were in the ponds from Monday until Thursday. The heavy rains drove them away and so far today it has been to cold. I've been to Florida by plane and car. They can't be going there for the day and returning. So, where are they going? Where do they hide from prying eyes? While I'm asking I have the same question about sugar ants. They are all over the place one day, gone the next, and then back again. I've never heard that ants hibernate, but what happens to them? edit: I guessed on a category for this. I wanted to go with Biology, but that seemed to focus more on a molecular level. submitted by /u/SiRyEm [link] [comments]

How does solid matter stay in the together if it is being spun? Shouldn't relativistic effects tear all matter apart? Posted: 11 Mar 2016 11:18 AM PST Obviously, matter doesn't get torn apart when it moves. So I know there is some effect keeping it together. But this is the scenario I imagine: An armature of solid metal, with one end mounted on an axle so it can spin, similar to a clock dial. Set the arm in motion, and the center will be travelling at a slower rate than the outer edge. Since the outer edge is travelling faster, isn't the matter at that point feeling (even minuscule) greater time-related relativistic effects than the matter at the center? And as this happens, wouldn't different points of the arm start to lag (in time) behind other parts? And the matter would get torn apart? A large armature illustrates this better, but I don't understand why this wouldn't happen at all scales also. submitted by /u/slimeslug [link] [comments]

Do migrating birds always align into air currents with the least air resistance? Posted: 11 Mar 2016 06:57 AM PST submitted by /u/4apalehorse [link] [comments]

Is there an experiment to directly measure the one-way speed of light? Posted: 11 Mar 2016 05:05 PM PST To my understanding we only have experiments to measure the two-way speed of light because due to relativistic effects as soon as you move two synced clocks with respect to one another to measure the time a light beam takes to travel, they will disagree, but that disagreement depends on the speed of light. So by convention we just take the average of the two way trip, but for all we know light could move faster in one direction than it does in another? submitted by /u/SuicidalEclair [link] [comments]

What has happened when a fetus fails to develop one of its hands or feet? Where has that part of the "blueprint" the cells should be following gone? Posted: 11 Mar 2016 03:35 AM PST submitted by /u/thrawoyaw [link] [comments]

Can Flux pinning happen in a B field and an H Field? If not one of them, why not, and what's the difference between the two? Posted: 11 Mar 2016 02:35 AM PST I'm only an A2 Physics student, so while I'm pretty fascinated by this phenomenon, I don't know a great deal. I read that the number flux tubes are proportional to the flux per unit area - is that not just flux density? This is the main reason I ask this question - I'm trying to see if I can link what I've learned from my studies to this phenomenon to better understand it. Thanks. submitted by /u/SickleSandwich [link] [comments]

Science behind knowing time of death of a loved one? Posted: 11 Mar 2016 07:29 PM PST In an Askreddit thread that I will link later, people talked about waking up at odd hours for seemingly no reason, then later finding a loved one had died at that time. Multiple people had stories about this happening. I like to believe these stories are real and have some significance, but I like basis in fact. Is there any name for this phenomenon or any science behind it at all? Hypothesise or anything? submitted by /u/fff8e7cosmic [link] [comments]

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How is there no center of the universe?

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• How is there no center of the universe?
• Do the children of women who suffer from fertility problems have a higher chance of being disabled in any way?
• With a high enough powered telescope and knowing where to look, would a person be able to see the artifacts left behind on the moon by the Apollo astronauts?
• How do things tie themselves up?
• How is Earth 4.6 billion years old? What would it have looked like in its proverbial first birthday?
• What are the differences between how IBM's Deep Blue was programmed when it beat Kasparov vs. Google's Deepmind when it beat Lee Se-dol?
• In the absence of any meaningful gravitational field, can Einstein's theory of special relativity explain all static, dynamic, and kinematic observations?
• Are most advancements in AI from better hardware or more advanced formulae?
• Does breaking helium into hydrogen absorb energy?
• What does diets, physical and mental exercises affect cognitive functions and, if so, how?
• Had any cultures proposed that stars were other Suns further away before it was scientifically verifiable?
• Is climate change related to heat capacity of combustion product gases relative to the starting gases?
• How can I see the dark part of the moon when it is in its crescent phase?
• Why isn't the universe's age infinite?
• Are there any studies that actual show that altering screen colour temperature *actually* avoids sleep disruption?
• Reading recent articles, I get that we recently spotted the most distant/oldest galaxy ever, 13.4 billion light years away. With my understanding of the expansion of the universe, this galaxy was much closer to us than 13.4 bn ly, at the time it looked like what we see of it today. Am I correct ?
• Are there organisms with only a few cells?
• Do macrophages (and other immune defensive cells) vary in strength, size and lifespan?
• Why does old water taste "stale"?
• How does gravity bend space in 3 dimensions? The usual depictions shows only 2. (Related, what "shape" is the universe?)

How is there no center of the universe? Posted: 10 Mar 2016 07:16 AM PST Okay, I've been trying to research this but my understanding of science is very limited and everything I read makes no sense to me. From what I'm gathering, there is no center of the universe. How is this possible? I always thought that if something can be measured, it would have to have a center. I know the universe is always expanding, but isn't it expanding from a center point? Or am I not even understanding what the Big Bang actual was? submitted by /u/Johnny_Holiday [link] [comments]

Do the children of women who suffer from fertility problems have a higher chance of being disabled in any way? Posted: 10 Mar 2016 10:04 PM PST submitted by /u/Notcow [link] [comments]

With a high enough powered telescope and knowing where to look, would a person be able to see the artifacts left behind on the moon by the Apollo astronauts? Posted: 10 Mar 2016 07:11 AM PST submitted by /u/funkefresh82 [link] [comments]

How do things tie themselves up? Posted: 11 Mar 2016 05:43 AM PST Headphones / fibres / myself, how does it all just randomly tie itself up when left alone? Like this Edit: I always fuck up the link brackets. submitted by /u/BradlePhotos [link] [comments]

How is Earth 4.6 billion years old? What would it have looked like in its proverbial first birthday? Posted: 11 Mar 2016 02:31 AM PST submitted by /u/seneschall- [link] [comments]

What are the differences between how IBM's Deep Blue was programmed when it beat Kasparov vs. Google's Deepmind when it beat Lee Se-dol? Posted: 10 Mar 2016 03:41 PM PST Did Deep Blue use "learning" methods like Deepmind? What exactly are "genetic algorithms?" Why aren't we using this technology to make CPU's far more complicated but faster than what humans design? submitted by /u/Stuck_In_the_Matrix [link] [comments]

In the absence of any meaningful gravitational field, can Einstein's theory of special relativity explain all static, dynamic, and kinematic observations? Posted: 10 Mar 2016 01:29 PM PST More specifically, can special relativity model accelerating reference frames? If so, can it make predictions within the frame that is accelerating or can it only make predictions of an accelerating frame while viewing the accelerating frame from a separate inertial frame? submitted by /u/UniqueWorldline [link] [comments]

Are most advancements in AI from better hardware or more advanced formulae? Posted: 10 Mar 2016 03:12 PM PST Theoretically, a computer could brute force a problem to figure out every possible optimal solution, but that is absurdly infeasible in most instances, so systems use tricks such as classifiers and error minimization to get a "best guess." When new milestones such as Deepmind's recent victories are reached, is this more due to faster processors allowing for deeper/wider searches with existing algorithms, or have the algorithms themselves improved? (I'm sure it's a little of column A and a little of column B, buy I'm asking for a little more specific than that) submitted by /u/Cranyx [link] [comments]

Does breaking helium into hydrogen absorb energy? Posted: 11 Mar 2016 04:32 AM PST If making He from H release energy does it mean that breaking an He atom will absorb energy? submitted by /u/aimnox [link] [comments]

What does diets, physical and mental exercises affect cognitive functions and, if so, how? Posted: 10 Mar 2016 05:56 PM PST What does diets, physical and mental exercises affect cognitive functions and, if so, how? Thank you, ~Waddlesticks submitted by /u/waddlesticks [link] [comments]

Had any cultures proposed that stars were other Suns further away before it was scientifically verifiable? Posted: 10 Mar 2016 02:53 PM PST submitted by /u/OoiraqiwomenoO [link] [comments]

Is climate change related to heat capacity of combustion product gases relative to the starting gases? Posted: 10 Mar 2016 01:52 PM PST I have generally good knowledge of chemistry, but I am beginning to think that I have understood the mechanism of climate change and greenhouse gases incorrectly from the beginning. I may have just learned the wrong thing early on and never looked back. Here's how I understand greenhouse gases. Let's think about combustion in its simplest form: coal combustion. C (s) + O2 (g) -> CO2 (g). The gas we started with was O2, and we exchanged one O2 mole for one CO2 mole. I always just assumed that CO2 must have a lower heat capacity than O2. Therefore, when the sun's (relatively constant) energy hits a mole of CO2, it is able to warm it up more than it would be able to warm up the mole of O2 that existed before. Hence, the temperature rises. After looking at a heat capacity table, a mole of CO2 has a higher heat capacity than a mole of O2, so this turns my whole understanding upside down. Does a gas' quality of being a greenhouse gas have anything to do with its heat capacity, or are they completely unrelated qualities? submitted by /u/sorenlarrington [link] [comments]

How can I see the dark part of the moon when it is in its crescent phase? Posted: 10 Mar 2016 07:16 PM PST So currently in Arizona and the moon is only partially lit up but I can clearly see the rest of it. It is black but is a different black than the night sky. submitted by /u/PdanaBaera [link] [comments]

Why isn't the universe's age infinite? Posted: 10 Mar 2016 12:51 PM PST I thought I understood this, but on longer thought it seems there's something I need cleared up. We measure the age of the universe (I believe) by backing out how long ago the universe's expansion would bring the observable universe into a single point, if run in reverse. If we imagine a timeship that somehow moves in the negative time direction, it would take (supposedly) 13.82 billion years to reach this point. But here's the kicker. We know from general relativity that a high local gravity slows your passage through time. So if we go through a region of space where there is more mass, I expect our passage through time itself to be slowed. As we go further and further back, where the universe was more dense, we move more and more "slowly" through time, never actually reaching the first instant - since this is where the density is infinite and passage through time (I expect) should be zero. So such a timeship would never be capable of reaching the first instant in time; it would instead take forever to reach the beginning. So where does my reasoning break down? Why do we say the universe has a set age, when as far as I can tell it took "infinitely long" for particles to go from infinitely dense to their current state? submitted by /u/Dont_Think_So [link] [comments]

Are there any studies that actual show that altering screen colour temperature *actually* avoids sleep disruption? Posted: 10 Mar 2016 08:17 AM PST There's a lot of interest in software that alters the colour temperature of screens to avoid disrupting sleep patterns - making it redder in the evening. The new beta of iOS implements it and the f.lux software is popular on Macs. submitted by /u/HeartyBeast [link] [comments]

Reading recent articles, I get that we recently spotted the most distant/oldest galaxy ever, 13.4 billion light years away. With my understanding of the expansion of the universe, this galaxy was much closer to us than 13.4 bn ly, at the time it looked like what we see of it today. Am I correct ? Posted: 10 Mar 2016 09:53 AM PST What I understand is that in 13.4 bn years (close to the universe age) light travels 13.4 bn ly. But when photons left that galaxy to reach us, their "starting point", at that time, was closer to our today position than 13.4 bn ly. So, now, that galaxy is 13.4 bn ly away from us, but was closer then. What was the actual distance at that time? I am getting confused with articles I have read, mixing both (distance and elapsed time), but I may think I understand the expansion of the universe, while I actually do not. Please enlighten me. submitted by /u/bouli_ [link] [comments]

Are there organisms with only a few cells? Posted: 10 Mar 2016 10:35 AM PST I know there are lots of single-celled organisms, but even really small multicellular organisms like c. elegans or something have a lot of cells. Are there any organisms that have, say, more than 1 but fewer than 100 cells? submitted by /u/TheApiary [link] [comments]

Do macrophages (and other immune defensive cells) vary in strength, size and lifespan? Posted: 10 Mar 2016 11:40 AM PST I watched a video from Kurzgesagt (in a nutshell) about how some our of immune system works. And I wondered about this question since in the video they mentioned that macrophages die after some time of fighting against the bacteria and they have to be kept living by other cells. But to the macrophages vary in those aspects? submitted by /u/Chromiczlul [link] [comments]

Why does old water taste "stale"? Posted: 10 Mar 2016 11:05 AM PST If I leave a glass of water out for a day or more it has a distinct "stale" taste. What in the water changes? Or is it psychological? submitted by /u/rgryffin13 [link] [comments]

How does gravity bend space in 3 dimensions? The usual depictions shows only 2. (Related, what "shape" is the universe?) Posted: 10 Mar 2016 10:45 AM PST Let's see if this makes any sense: Another redditor made this comment about the universe being "planar", and it reminded of how most depictions of gravity look something like this, which I assume is quite simplified. But if everything is 3D, how should this look as opposed to these 2D depictions? How planar really is the universe? I tend think of the universe as a giant dark room with stars/planets/galaxies etc. floating all over in three-dimensional space. Is that totally incorrect? But then thinking of it as something planar with things "sitting" on top doesn't seem right at all. submitted by /u/Baumkronendach [link] [comments]

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