Since radio waves and light are both forms of electromagnetic radiation, is it possible to detect visible light with an antenna?

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• Since radio waves and light are both forms of electromagnetic radiation, is it possible to detect visible light with an antenna?
• Does a stronger immune system lead to stronger allergic reactions?
• Can you integrate cos(t)-sqrt(cos^2(t)+24) dt?
• Why do I get freckles and does my hair go blonder when I get a lot of sun?
• How far apart are raindrops vertically?
• Why brakes lose their braking power once they get hot?
• Why don't hummingbirds stay in flocks like other birds?
• CRT displays show weird colors in presence of a magnet due to deflection of electrons. Why does the effect last even when the external magnet is removed?
• How does potassium get from food to a cell?
• Why does buoyancy equal the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g and not the density of the object submerged?
• Why does ionic propulsion in spacecraft use noble gases as propellent?
• How do honey bees establish a new hive?
• What would a spontaneous phase change in the quantum vacuum be like?
• Are electric cars more dangerous to pedestrians and cyclists than other cars due to their overall lower noise levels?
• What's the science behind creativity and imagination?
• How do we accurately measure the speed of light?
• What is the physics behind the interaction of an x-ray with an atom in xrays diffraction?
• If gravity is mediated by gravitons, how would gravitons be able to escape a black hole?
• Were D&C procedures part of the tubal ligation procedure in the early or mid 1980's?
• What would happen if you gave an electron the exact energy of its work function?
• What is the effect on the microstructure of alloying aluminium?

Since radio waves and light are both forms of electromagnetic radiation, is it possible to detect visible light with an antenna? Posted: 08 May 2016 05:18 AM PDT submitted by /u/Andoryuuta [link] [comments]

Does a stronger immune system lead to stronger allergic reactions? Posted: 08 May 2016 06:14 AM PDT Allergies is the immune system mistakenly beliving a substance is harmful and therefor attacks it. Does this mean a stronger immune system leads to a stronger allergic reaction? Also. Do people with AIDS no longer experience allergies? submitted by /u/brattmyhr [link] [comments]

Can you integrate cos(t)-sqrt(cos^2(t)+24) dt? Posted: 08 May 2016 06:20 PM PDT I'm trying to find the area in terms of theta of the polar graph r = cos(t)-sqrt(cos2 (t)+24). To do this I want to integrate r dt (t being theta) from 0 to some angle. I can't figure out how to do the integration. Wolfram won't give me an answer. Is the integral possible? Am I approaching this wrong? EDIT: fixing notation submitted by /u/Jmaster414 [link] [comments]

Why do I get freckles and does my hair go blonder when I get a lot of sun? Posted: 08 May 2016 06:06 AM PDT submitted by /u/Gehaktbal321 [link] [comments]

How far apart are raindrops vertically? Posted: 08 May 2016 03:18 PM PDT On average, how long before 2 raindrops hit roughly the same spot one after another? I guess what I'm asking is, what is the average rate at which raindrops fall? If I place a raindrop sized object under a raincloud, how many raindrops will land on that object in 1 second? submitted by /u/Haymaker33 [link] [comments]

Why brakes lose their braking power once they get hot? Posted: 08 May 2016 08:52 AM PDT submitted by /u/tiqa13 [link] [comments]

Why don't hummingbirds stay in flocks like other birds? Posted: 08 May 2016 05:11 AM PDT submitted by /u/Enigmatic_Continuum [link] [comments]

CRT displays show weird colors in presence of a magnet due to deflection of electrons. Why does the effect last even when the external magnet is removed? Posted: 08 May 2016 10:17 AM PDT submitted by /u/CurrentlySingle [link] [comments]

How does potassium get from food to a cell? Posted: 08 May 2016 03:37 PM PDT What happens once food enters the intestines, what process recognizes potassium? How does the potassium move from the intestines to a cell in your finger that needs it? submitted by /u/GoldySilveryIrony [link] [comments]

Why does buoyancy equal the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g and not the density of the object submerged? Posted: 08 May 2016 10:22 AM PDT When we talk about the Arquimedes principle and buoyancy, why does buoyancy have to do with the weight of displaced fluid rather than the weight of the object submerged? I ask this since the sum of the vertical forces that are applied in an object, in equilibrium, by the fluid in which he's submerged equals the weight of that object which,on another hand, also gives buoyancy... Sorry, my mother tongue is not english and it makes it rather difficult to explain my doubt, even more since it's about physics. submitted by /u/OmegaWard [link] [comments]

Why does ionic propulsion in spacecraft use noble gases as propellent? Posted: 08 May 2016 10:25 PM PDT Wouldn't it be more efficient to use something that forms ions more readily, i.e. flourine? submitted by /u/mrx347 [link] [comments]

How do honey bees establish a new hive? Posted: 08 May 2016 06:20 AM PDT Does a hive send some kind of "expedition" to a suitable location? How do they choose where to settle? submitted by /u/Batilda [link] [comments]

What would a spontaneous phase change in the quantum vacuum be like? Posted: 08 May 2016 02:26 PM PDT I've read that it's possible that the "false vacuum" can spontaneously decay to a lower energy value. What would that look like from our perspective? What form would the liberated energy take? Would the laws of physics be the same inside the expanding volume of lower vacuum energy, or different? Could life, or even matter exist in the new vacuum state? submitted by /u/Userkare [link] [comments]

Are electric cars more dangerous to pedestrians and cyclists than other cars due to their overall lower noise levels? Posted: 08 May 2016 06:03 AM PDT submitted by /u/JailbirdCZm33 [link] [comments]

What's the science behind creativity and imagination? Posted: 08 May 2016 04:29 AM PDT I'm a game designer going through art school, and after taking it for granted for a while, I started wondering what exactly creativity is and how it works. I'm trying to find out things like when it first arose in humans, if it's present in any other animals (that we know of), etc. I'd imagine it has survival value, but I'm still curious. submitted by /u/Illumineillustrator [link] [comments]

How do we accurately measure the speed of light? Posted: 08 May 2016 11:12 AM PDT How do we accurately measure the speed of light? How do we accurately measure how far light travels in one year? I'm sure it takes some very precise calculations and instruments to measure this. submitted by /u/gositinthecorner2016 [link] [comments]

What is the physics behind the interaction of an x-ray with an atom in xrays diffraction? Posted: 08 May 2016 11:17 AM PDT submitted by /u/MmmmmmmmDonuts [link] [comments]

If gravity is mediated by gravitons, how would gravitons be able to escape a black hole? Posted: 08 May 2016 03:07 AM PDT As I understand, gravitons would be massless particles travelling no faster than C, just like photons. Photons cannot escape, but it seems gravitons would need to in order for the gravitation of a black hole to affect anything beyond its event horizon. submitted by /u/JudasCrinitus [link] [comments]

Were D&C procedures part of the tubal ligation procedure in the early or mid 1980's? Posted: 08 May 2016 05:06 AM PDT So today is Mother's Day and a few years ago my mother confided in me a guilt she has carried for a long time. Several months after the birth of my youngest sibling, she had her tubes tied. Apparently the doctor performed a D&C as part of the procedure. She was never told that she was pregnant but later felt that this would be the only reason for that being included in the procedure. So in addition to giving up her own fertility, she has a guilt that she has carried related to a potential loss of a child she never bore. Can someone give me some background on the nature of this procedure as it was performed around 1984, if her worries are based on fact or fiction? Also, make sure to wish you mom a happy mother's day. submitted by /u/52fighters [link] [comments]

What would happen if you gave an electron the exact energy of its work function? Posted: 08 May 2016 07:06 AM PDT I know that when you give an electron energy it can only be liberated if that energy is greater than the work function of the metal it is a part of. And that the kinetic energy of the liberated electron is equal to the energy of the photon - the work function. From Ek= Hf - work function So what would happen if the photons energy was exactly the same as the work function. To my understanding nothing can have 0 kinetic energy. submitted by /u/RavernousPenguin [link] [comments]

What is the effect on the microstructure of alloying aluminium? Posted: 08 May 2016 04:56 AM PDT submitted by /u/smirky_doc [link] [comments]

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Why does color fade when left in sunlight for extended periods of time?

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• Why does color fade when left in sunlight for extended periods of time?
• Why is only 10% of the population left handed?
• How can phycists know the average lifetime of a proton?
• What evidence is there to support the theory that inside every black hole is another universe and our universe is inside of a black hole another universe?
• Why aren't all amino acids glucogenic?
• If all the cells and molecules in our skin change, then why do we keep bruises and marks from our childhood?
• In the Schrödinger equation solutions for a square well, why do we assume the electron is not travelling?
• I've often heard Jupiter referred to as a "failed star." Is this a fair representation? How close in terms of mass was it to actually becoming a star?
• Are there any studies that show other species to be capable of lying/dishonesty?
• Does eating chicken increase antibiotic resistance in humans?
• Why does a Neutron star gets smaller the more mass it gains ?
• If I am smelling a food, how do the particles that enter my nose leave the food in the first place?
• How does car wax work to protect the paint colour?
• Can a strong enough electric field penetrate Faraday cage?
• Is all body fat newly synthesized?
• If graphite can be turned into graphene, then can a similar thing be done with black phosphorus?
• Can bleach expire/'go bad'?
• Why is rocket staging more efficient?
• Can the gravitational pull between objects on earth be measured?
• Why does my radio get louder when I put my hand near it?
• Why time goes slower when you're near a massive object? (a black hole for example)
• What mathematical conjecture looked solid, only to fall apart when presented with larger numbers?
• Does traveling through warped spacetime affect the polarization of photons (or any other polarized particle, I suppose), or just the direction of travel?

Why does color fade when left in sunlight for extended periods of time? Posted: 07 May 2016 06:51 AM PDT We have a rack of DVD cases next to the window, and recently I've noticed the covers have all faded in color. Strangely the red ones seem to have faded far more than any of the others. submitted by /u/Q101dabaws [link] [comments]

Why is only 10% of the population left handed? Posted: 07 May 2016 04:14 PM PDT submitted by /u/me-hablo-es-no [link] [comments]

How can phycists know the average lifetime of a proton? Posted: 08 May 2016 04:48 AM PDT In a physics book at school I read that the average lifetime of a proton is > 1,81037 seconds (5,71029 years). But how can we know this if the universe isn't even that old, not even remotely? submitted by /u/JasJaco1234 [link] [comments]

What evidence is there to support the theory that inside every black hole is another universe and our universe is inside of a black hole another universe? Posted: 07 May 2016 06:15 PM PDT submitted by /u/MyDeadKitten [link] [comments]

Why aren't all amino acids glucogenic? Posted: 08 May 2016 12:24 AM PDT As far as I'm aware leucine and lysine are ketogenic. But why is this? Why can't the body just rely on glucogenic amino acids? submitted by /u/LunarLuxa [link] [comments]

If all the cells and molecules in our skin change, then why do we keep bruises and marks from our childhood? Posted: 07 May 2016 03:58 PM PDT submitted by /u/Unenemous [link] [comments]

In the Schrödinger equation solutions for a square well, why do we assume the electron is not travelling? Posted: 07 May 2016 10:55 PM PDT If you send a wave along a slinky, it can still have a 0 amplitude at the edges, yet the pulse itself travels back and forth between the source wall and the opposite wall. Why can't this occur for electrons in the square well? Why do we assume that the wave is a standing wave, instead of a travelling wave? submitted by /u/lepriccon22 [link] [comments]

I've often heard Jupiter referred to as a "failed star." Is this a fair representation? How close in terms of mass was it to actually becoming a star? Posted: 07 May 2016 11:09 AM PDT submitted by /u/websitegenius [link] [comments]

Are there any studies that show other species to be capable of lying/dishonesty? Posted: 07 May 2016 01:52 PM PDT submitted by /u/MikeW86 [link] [comments]

Does eating chicken increase antibiotic resistance in humans? Posted: 07 May 2016 03:31 PM PDT I've read here that there is a link between eating chicken and antibiotic resistance. The study doesn't seem very reliable to me, because it wasn't a controlled experiment. What is the current understanding of eating chicken with antibiotics? submitted by /u/groenewald [link] [comments]

Why does a Neutron star gets smaller the more mass it gains ? Posted: 07 May 2016 11:19 AM PDT submitted by /u/KnightArts [link] [comments]

If I am smelling a food, how do the particles that enter my nose leave the food in the first place? Posted: 07 May 2016 02:57 PM PDT If I am smelling an apple, then it means tiny particles of apple have shuffled off the outer layer and are diffusing through the air and some of them enter my smell receptors and bingo! it smells like an apple. Right? But an apple is a solid, so why would it diffuse in the first place? Also, what is the rate of diffusion, or rather, what variables does it change with? submitted by /u/suugakusha [link] [comments]

How does car wax work to protect the paint colour? Posted: 07 May 2016 05:44 PM PDT My car had a tough life for two years in the hands of the previous owner, than some parts that face upward are now less red than vertical parts (doors etc). I am told that waxing car would help fight the sun. How does it work, and how does waxing and wiping things off almost rightaway work? It doesn't seem like anything is sticking to the paint like clearcoat does. Also, i noticed when waxing it comes on in streaks. Wouldn't that protect just those streaks and not the lines in between? submitted by /u/Movisiozo [link] [comments]

Can a strong enough electric field penetrate Faraday cage? Posted: 07 May 2016 06:06 AM PDT submitted by /u/thetimujin [link] [comments]

Is all body fat newly synthesized? Posted: 07 May 2016 07:43 AM PDT I think I understand what happens when I get fat by eating pasta. Some of the carbohydrate is oxidized to provide energy which is used to synthesize body fat, using the rest of the carbohydrate as a source of carbon atoms, hydrogen atoms, and more oxygen atoms than are needed. When I get fat by eating animal fat is it just the same deal: burn some to power synthesis using the rest as raw materials? Or is there a process for recognizing fat molecules and storing suitable ones? Are all the fat molecules in my body synthesized locally, or were some made months earlier, by a cow in a field eating grass? Wikipedia talks over my head about triglycerides, but I get enough out of it to wonder if the answer is: half and half. The fatty acid molecules are found in the diet, but must be assembled into threes, with glycerol, locally. submitted by /u/AlanCrowe [link] [comments]

If graphite can be turned into graphene, then can a similar thing be done with black phosphorus? Posted: 07 May 2016 03:47 PM PDT I was just thinking, that since black phosphorus has a similar structure and similar properties to graphite, would it be possible to make a "phosphorus-ene" or something similar, with the same properties as graphene? And what about phosphorus buckyballs or phosphorus nanotubes? submitted by /u/Popopopper123 [link] [comments]

Can bleach expire/'go bad'? Posted: 07 May 2016 05:43 PM PDT If bleach has an expiration date, what would happen to it if it went past the date? submitted by /u/Jul1usC [link] [comments]

Why is rocket staging more efficient? Posted: 07 May 2016 07:36 AM PDT For example, when you release a stage after using up all its fuel to lessen the empty mass. Why is this more efficient than say having one main fuel "compartment" and just burning it all out of what would be the first stage engines? submitted by /u/kerb4lv2 [link] [comments]

Can the gravitational pull between objects on earth be measured? Posted: 07 May 2016 11:08 AM PDT Say you have a massive object like a 747. And something small, like a post-it note. Can the 747's pull on the post-it note (and vice versa) be measured? submitted by /u/amity_ [link] [comments]

Why does my radio get louder when I put my hand near it? Posted: 07 May 2016 11:38 AM PDT submitted by /u/Questale [link] [comments]

Why time goes slower when you're near a massive object? (a black hole for example) Posted: 07 May 2016 02:21 PM PDT I just don't understand why time goes slower. Is anyone able to explain me why? Is it because the light is bended somehow by the object and arrives at an external observer slower? Let's take 2 observers, both 20 years old. One decides to go near a black hole for some time and return to the second observer. When they meet again, will they be the same age? I just don't get how one would age slower/faster being somewhere else. submitted by /u/Caydenz [link] [comments]

What mathematical conjecture looked solid, only to fall apart when presented with larger numbers? Posted: 07 May 2016 10:18 AM PDT I've been reading the Wikipedia page about Fermat's Last Theorem. It includes a passage: Proofs of individual exponents by their nature could never prove the general case: even if all exponents were verified up to an extremely large number X, a higher exponent beyond X might still exist for which the claim was not true. (This had been the case with some other past conjectures, and it could not be ruled out in this conjecture.) What are some of these past conjectures? submitted by /u/DukeEin [link] [comments]

Does traveling through warped spacetime affect the polarization of photons (or any other polarized particle, I suppose), or just the direction of travel? Posted: 07 May 2016 11:06 AM PDT I guess I don't know for sure how special relativistic phenomena affect polarization either, although I have an intuition. If I am traveling near light speed along x, and intersect (unpolarized) photons traveling along y, it seems to be I would measure them as being linearly polarized along z (more completely so, the closer to c I was going). If the photons were linearly polarized along x, rather than unpolarized, then it seems that the photons would seem to disappear as I approached c. Are those intuitions completely off base? Are there any interesting general relativistic effects on polarization that can be intuitively understood? Thanks! submitted by /u/stimulatedecho [link] [comments]

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Why is the answer for Earth's Schwarzschild radius: the volume Earth would have to be compressed in order to form a black hole, exactly the same when derived either from Newtonian mechanics or General Relativity ?

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• Why is the answer for Earth's Schwarzschild radius: the volume Earth would have to be compressed in order to form a black hole, exactly the same when derived either from Newtonian mechanics or General Relativity ?
• Why do we use Sodium for street lighting ?
• If I transported a flock of birds to the southern hemisphere, would they fly north for the winter or head further south when it starts getting cold?
• What is the absolute fastest that sound can travel, and in what medium can it obtain that speed?
• If there was a giant ring of steel with a radius one foot greater than the Earth's radius placed around Earth, would it seemingly levitate one foot off the ground?
• Could a near-light-speed spacecraft travel in a loop, or only in straight lines?
• Do we experience less gravity during day time, because of the pull from the sun counteracting Earth's gravity? How big is this effect?
• Is there any evidence that Uranus's axis is slowly "correcting" itself to be in line with the other planets' axes?
• How do isolated populations of animals keep from getting inbred?
• Is it possible to write an equation for eccentric anomaly of an elliptical orbit in terms of time?
• As the universe continues to expand, is it "seeding" (for lack of a better term) matter behind its boundary or only expanding empty space?
• Packing: Rolling vs Folding. Is there even a difference?
• Is the amount of oxygen in the air in/arround a big city noticable lower than in small cities or rural areas?
• When I hear a sonic boom, am I hearing all the sound generated by the speeding projectile over a certain distance all in one go?
• Heard that we tend to like people who look like ourselves more. Is it about how we actually look, or how we think we look?
• What's the difference between d^2 x(t)/dt^2 = -x(t), and idx/dt=-x(t)?
• Why doesn't the black hole at the center of the galaxy cosumes the galaxy itself?
• Why are large primes so desirable and hard to calculate?

Why is the answer for Earth's Schwarzschild radius: the volume Earth would have to be compressed in order to form a black hole, exactly the same when derived either from Newtonian mechanics or General Relativity ? Posted: 06 May 2016 09:23 PM PDT I saw this post and someone did a mathematical calculation for the radius : The formula for escape velocity is Vesc = sqrt(2GM/R) where G is the gravitational constant, M is the mass (of the Earth, in this case) and R is the radius in question. If we plug c (speed of light) in as Vesc, G = 6.67408 × 10-11 m3 kg-1 s-2, and M = 5.972 × 1024 kg, we can solve for R. R = 0.8870 cm Someone else later mentioned that : The funny thing is that what you did is the classical Newtonian gravity calculation, but in a universe where Einstein's General Relativity is in effect there is no reason to expect that calculation to actually be true. It took tons of work after GR was discovered before Schwarzschild managed to do the calculation and figure this out (Einstein couldn't do it)... and the answer was exactly the same. I want to know why? Was the general approximation in Newtonian physics relevant here or was there some other reason ? submitted by /u/p-p-paper [link] [comments]

Why do we use Sodium for street lighting ? Posted: 05 May 2016 03:25 PM PDT Hi redditors ! Ok so coming back home today I had a thought I have frequently about how sodium is used in street lighting -at least the orange ones- and I wondered, why did we use sodium specifically ? I know about how every atoms has its own emission spectrum -and absorption- and that sodium has a double spectral line around 589nm, which is in the 'orange part' of the visible spectrum, but I was wondering, why did we pick sodium and orange lightning specifically. Was it for economical reasons ? Because Orange was a better choice for a reason I don't really get ? Thanks in advance for answering ! Edit: Thanks for the answers guys ! That's almost what I thought but the reflection on the impact on astronomy is really interesting ! submitted by /u/ThatSlowBerry [link] [comments]

If I transported a flock of birds to the southern hemisphere, would they fly north for the winter or head further south when it starts getting cold? Posted: 06 May 2016 07:34 AM PDT Thus dooming themselves. submitted by /u/1jl [link] [comments]

What is the absolute fastest that sound can travel, and in what medium can it obtain that speed? Posted: 06 May 2016 12:29 PM PDT submitted by /u/efficiens [link] [comments]

If there was a giant ring of steel with a radius one foot greater than the Earth's radius placed around Earth, would it seemingly levitate one foot off the ground? Posted: 06 May 2016 08:39 AM PDT Let's just assume that the Earth is perfectly round in this situation, and the steel is unbendable and indestructible. Would it appear to float? Why or why not? What if the steel wasn't unbendable/indestructible? submitted by /u/TheAlmightyLem [link] [comments]

Could a near-light-speed spacecraft travel in a loop, or only in straight lines? Posted: 06 May 2016 08:53 AM PDT Lets say I have a spaceship that is capable of accelerating to near light speed (and it takes a while to get going that fast), and I want to use it to experience time dilation and come back to Earth far in the future. Is the only real option to accelerate in a straight line, then come to a stop, turn around, and come back in another straight line? To me this is not ideal because you have to go through two acceleration/deceleration cycles, so the time dilation effect relative to Earth would be lessened. So, could it be possible / practical for the spacecraft to travel in a loop, by continuously adjusting its direction of thrust until it travels in a complete circle? Intuitively I think that this would not be possible at near-light speeds, but my intuitive sense of the physics here is not too strong. Would be very interested to hear what equations or theorems are relevant here :) Thanks in advance for any responses! submitted by /u/Fosforus [link] [comments]

Do we experience less gravity during day time, because of the pull from the sun counteracting Earth's gravity? How big is this effect? Posted: 06 May 2016 07:35 AM PDT submitted by /u/lucaspon [link] [comments]

Is there any evidence that Uranus's axis is slowly "correcting" itself to be in line with the other planets' axes? Posted: 06 May 2016 09:50 AM PDT submitted by /u/sonorousAssailant [link] [comments]

How do isolated populations of animals keep from getting inbred? Posted: 06 May 2016 07:24 AM PDT What made me think of this was my run today. I live near a pond, and there is a small family of muskrats in it. I'd say 5 or so at most. Now, there aren't any other ponds or anything for several miles around, so I'm wondering what these populations do. Do they travel back and forth? Do they breed with siblings and parents? How do different types of animals handle this situation? submitted by /u/RPShep [link] [comments]

Is it possible to write an equation for eccentric anomaly of an elliptical orbit in terms of time? Posted: 06 May 2016 09:01 AM PDT I know you can get the mean anomaly in terms of time for an elliptical orbit, but is it possible to get the eccentric anomaly in terms of time? submitted by /u/Jmaster414 [link] [comments]

As the universe continues to expand, is it "seeding" (for lack of a better term) matter behind its boundary or only expanding empty space? Posted: 06 May 2016 07:35 AM PDT Put differently, is all the matter there ever will be already "in play," or is some of it still being carried by the expansion wave of the universe? Edit: to be clear, I'm talking about something like debris riding a shockwave, not spontaneous creation of matter submitted by /u/dunaan [link] [comments]

Packing: Rolling vs Folding. Is there even a difference? Posted: 06 May 2016 02:22 AM PDT I'm packing in a few hours and I should have asked this in advance. Anyway, does it even make a difference? I'm thinking that however you fold the cloth, the size it takes will be about the same. And people are just exaggerating. I guess the question is more like, which method compresses the cloth better without the use of a sealed container and a vacuum? I believe that's the real question since people who are debating about which method to use are concerned about fitting more stuff. Also ignore the difference in which rolling will occupy the bag more (imagine solid vs liquid in a container). I say to ignore because even with folding you can use your socks to fill in the gaps. Or just roll some to fill the gaps. submitted by /u/PullIntestinesFrmAss [link] [comments]

Is the amount of oxygen in the air in/arround a big city noticable lower than in small cities or rural areas? Posted: 06 May 2016 07:59 AM PDT submitted by /u/Pidiotpong [link] [comments]

When I hear a sonic boom, am I hearing all the sound generated by the speeding projectile over a certain distance all in one go? Posted: 06 May 2016 05:22 AM PDT This is how I interpret this diagram of a mach cone if we place ourselves at the red dot, but I haven't yet (after some brief internet searching) found anywhere that explains it this way. Mach cone submitted by /u/BedSideCabinet [link] [comments]

Heard that we tend to like people who look like ourselves more. Is it about how we actually look, or how we think we look? Posted: 06 May 2016 02:47 AM PDT submitted by /u/singed1337 [link] [comments]

What's the difference between d^2 x(t)/dt^2 = -x(t), and idx/dt=-x(t)? Posted: 06 May 2016 05:57 AM PDT In this specific case, it's only true when d2 x(t)/dt2 =idx/dt, but is there a more general connection? The two equations give the same solution set. submitted by /u/Urist_was_taken [link] [comments]

Why doesn't the black hole at the center of the galaxy cosumes the galaxy itself? Posted: 06 May 2016 03:47 AM PDT submitted by /u/Bpbegha [link] [comments]

Why are large primes so desirable and hard to calculate? Posted: 06 May 2016 04:28 AM PDT Follow-Up: Why can't a formula like (10n ) +1 be used to find a prime of the desired length? submitted by /u/Kaingon [link] [comments]

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