How are drill bits that make drill bits made? And the drill bits that make those drill bits?

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• How are drill bits that make drill bits made? And the drill bits that make those drill bits?
• How long does it take for every brain cell to die after oxygen is cut off?
• Is there any correlation between certain names, and behavior? Are certain names more likely to succeed than other names? I imagine some names might cause bullying more than others. But I’m more curious if there are any names with a positive social correlation.
• What makes something “microwave safe” and another similar material not safe?
• I have often read of interspecies adoption and nursing of the adopted young, how does an animal produce milk for young that is not their biological offspring?
• Why does ribbon curl?
• Why are the mirrors on the newer telescopes shaped like hexagons?
• How do surgeons place back organs like intestines?
• Why does oxygen have a lower melting point than nitrogen?
• Can electromagnets produce a field of any shape? Are there limits to this?
• How are electrons "high energy"?
• Do radioactive metals decay faster when molten?
• Is there any difference between vertical or horizontal pupils in animals?
• What is the highest altitude we have ever found living organisms?
• Why do we need rectifiers?
• Why is the rest of the moon still slightly visible during a crescent moon?
• Do meerkat colonies suffer from inbreeding issues?
• What happens to the air inside your intestines when you are on a flying airplane?
• How do "airless tires" work?
• Why does a passing car horn reduce in pitch?
• If two elements are combined, what happens to their individual half-lives?
• When in a betting pool for a series of sports matches, is the optimal strategy choosing the probabilistic winners of each individual match (e.g., based on Vegas odds), or does that strategy, due to its expected popularity among other competitors in the pool, make it not optimal?

How are drill bits that make drill bits made? And the drill bits that make those drill bits? Posted: 17 Dec 2017 02:52 AM PST Discovery Channel's How It's Made has a segment on how drillbits are made. It begs the question how each subsequently harder bit is milled by an ever harder one, since tooling materials can only get so tough. Or can a drill bit be made of the same material as the bit it's machining without deforming? submitted by /u/ssinatra3 [link] [comments]

How long does it take for every brain cell to die after oxygen is cut off? Posted: 16 Dec 2017 08:53 AM PST Edit: I found this paper indicating brain cell life at 8 hours after but, unfortunately, that's all it tells us. It doesn't tell us whether or not some of the cells may stay alive longer. Quote from the paper: Animal models for human neurological and psychiatric diseases only partially mimic the underlying pathogenic processes. Therefore, we investigated the potential use of cultured postmortem brain tissue from adult neurological patients and controls. The present study shows that human brain tissue slices obtained by autopsy within 8 h after death can be maintained in vitro for extended periods (up to 78 days) and can be manipulated experimentally. We report for the first time that 1) neurons and glia in such cultures could be induced to express the reporter gene LacZ after transduction with adeno-associated viral vectors and 2) cytochrome oxidase activity could be enhanced by the addition of pyruvate to the medium. These slice cultures offer new opportunities to study the cellular and molecular mechanisms of neurological and psychiatric diseases and new therapeutic strategies. submitted by /u/Banda8820 [link] [comments]

Is there any correlation between certain names, and behavior? Are certain names more likely to succeed than other names? I imagine some names might cause bullying more than others. But I’m more curious if there are any names with a positive social correlation. Posted: 16 Dec 2017 12:02 PM PST submitted by /u/b1goldbilly [link] [comments]

What makes something “microwave safe” and another similar material not safe? Posted: 16 Dec 2017 08:35 AM PST I know some heat up and that makes them unsafe, but why do some materials heat up in a microwave and others don't? submitted by /u/Severse_Rhycology [link] [comments]

I have often read of interspecies adoption and nursing of the adopted young, how does an animal produce milk for young that is not their biological offspring? Posted: 16 Dec 2017 08:20 AM PST submitted by /u/arielflamingoish [link] [comments]

Why does ribbon curl? Posted: 17 Dec 2017 06:24 AM PST So I'm a physicist and mathematician but when wrapping presents my daughter asked me something I couldn't answer. Why does ribbon curl when you drag a sharp edge along it? So I'm asking any materials scientists out there. Edit: Can't figure out how to flair this mobile, sorry. submitted by /u/NoBooksForYou [link] [comments]

Why are the mirrors on the newer telescopes shaped like hexagons? Posted: 16 Dec 2017 09:21 AM PST I've seen in the news that there's going to be a big telescope in Chile, or Argentina? Can't remember. Anyways, the mirrors are tons of small hexagons. Why this shape and not squares or triangles? submitted by /u/Starspary [link] [comments]

How do surgeons place back organs like intestines? Posted: 16 Dec 2017 05:01 AM PST I have seen in some films and series how they take the intestines out of the chest and move them but I have never seen how they put them back. Is there any way of doing it or do they just place them back and they recover their shape by themselves? submitted by /u/Calcirium [link] [comments]

Why does oxygen have a lower melting point than nitrogen? Posted: 17 Dec 2017 06:57 AM PST To my knowledge it seems that oxygen should have a higher melting point because it has more electrons and will therefore stronger London/van der waal forces giving it a higher melting point. Is this wrong or is there another factor submitted by /u/wiggiebob [link] [comments]

Can electromagnets produce a field of any shape? Are there limits to this? Posted: 17 Dec 2017 06:37 AM PST Is it possible to create an electromagnetic array such that the field generated would produce an expected shape of any variety? What I envision is something akin to a monochrome LCD panel, except the "pixels" are peaks that pass a certain threshold of strength. Is this possible, and if so, are there limits in terms of size of apparatus that could produce this vs amplitude, and are there any properties that inhibit shrinking this down to the micrometer level? What I am thinking is of a programmable 1000x1000 grid of peaks at 10 micrometers2. Can this be done? submitted by /u/accidentalginger [link] [comments]

How are electrons "high energy"? Posted: 17 Dec 2017 12:18 AM PST I read in this AP bio book that as an electron is passed though a series of increasingly electronegative protein pumps to pump H+ across a membrane. The electron is no longer high energy after doing so. Does this mean that an electrons potential energy is measured by it's association with an electronegative molecule/particle. such as in a molecule that has C and O sharing electrons, the closer the electrons are to the oxygen (Which is more electronegative than carbon) per the amount of valence electrons is the potential energy of that molecule? Is this redox in a nutshell? ~A sophomore in high school submitted by /u/AlacasterSoi [link] [comments]

Do radioactive metals decay faster when molten? Posted: 16 Dec 2017 11:32 PM PST submitted by /u/420dankmemes1337 [link] [comments]

Is there any difference between vertical or horizontal pupils in animals? Posted: 16 Dec 2017 10:28 AM PST Does one angle have an advantage over the other? Also, wtf about square pupils in goats? Is there any advantage/need for not circular pupils? submitted by /u/acrowsmurder [link] [comments]

What is the highest altitude we have ever found living organisms? Posted: 16 Dec 2017 06:00 AM PST Recently I heard that the Griffin Vulture can reach altitudes of 10,000 meters and that several species of geese can fly over Mount Everest. However these are all large animals far from the most extreme of Earth's life, extremophiles. Is there living bacteria in the upper stratosphere? If so, how did it get there? Just how high have we found it? Can it sustain it's self up there indefinitely? submitted by /u/GalliumGames [link] [comments]

Why do we need rectifiers? Posted: 17 Dec 2017 12:19 AM PST Why cannot appliances work on A.C. as the polarity change is very quick? submitted by /u/thewhitenibba [link] [comments]

Why is the rest of the moon still slightly visible during a crescent moon? Posted: 16 Dec 2017 02:25 PM PST This photo shows how the rest of the moon not facing the sun is still visible. Could it be reflection from the earth or other sources? submitted by /u/ssinatra3 [link] [comments]

Do meerkat colonies suffer from inbreeding issues? Posted: 16 Dec 2017 07:30 AM PST I would think this is more of Zoology but it isn't an option for the flair. As territorial creatures, I'd expect meerkats to rarely accept strangers into their community, which would ultimately mean that they would just be mating with each other, yes? If this is the case, I would think that there would be massive inbreeding after a few generations and a severe lack of genetic diversity. Is this the case? Or do they in fact actually open up their community to outsiders more often than I assumed? submitted by /u/thehottestmess [link] [comments]

What happens to the air inside your intestines when you are on a flying airplane? Posted: 16 Dec 2017 08:30 AM PST submitted by /u/frankven2ra [link] [comments]

How do "airless tires" work? Posted: 16 Dec 2017 08:58 AM PST I get how the air pressure in an inflated tire can keep it from collapsing or deflating under the weight of a car, but how do airless tires manage to produce that much pressure without the use of air? submitted by /u/Dilplok [link] [comments]

Why does a passing car horn reduce in pitch? Posted: 16 Dec 2017 10:11 PM PST This might be a dumb question, and I apologize if 'physics' is the wrong flair for this question, but I've heard this quite a few times and have been curious about it. Why does a passing car horn reduce in pitch rather than just decibel level? If I yell a G note when far away from someone, do they still hear a G, or do they hear a lower note? submitted by /u/Jakeenes [link] [comments]

If two elements are combined, what happens to their individual half-lives? Posted: 16 Dec 2017 03:36 PM PST submitted by /u/AtmosphericStupidity [link] [comments]

When in a betting pool for a series of sports matches, is the optimal strategy choosing the probabilistic winners of each individual match (e.g., based on Vegas odds), or does that strategy, due to its expected popularity among other competitors in the pool, make it not optimal? Posted: 16 Dec 2017 07:45 AM PST Assuming a large scale wagering pool of thousands of individuals. Assuming Vegas odds are the true odds, and that odds are not typically 50/50, though they can be. E.g., in a March Madness (U.S.) bracket with 10,000 people, is the optimal strategy choosing the favorites? Or does this strategy welcome increased competition. submitted by /u/resumates [link] [comments]

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Why do airplanes need to fly so high?

---

• Why do airplanes need to fly so high?
• Can light and sound affect each other?
• What happens when microwaves hits metal?
• If we were able to accelerated a spaceship/probe to a fraction of the speed of light would space dust start punching tiny holes through it?
• How does binary convert into light waves in optical cables?
• Why do cable TV providers still need cable boxes which stream via coaxial cable?
• How do we know the axial tilt and rotation of planets in our solar system?
• Do men have hormonal cycles?
• What is the meaningful distinction between nuclides and isotopes?
• [PHYSICS] What other elements (Also hypothetical Elements e.g. Superactinoides) are in theory usable in atomic bombs and what would be their possible radioactive damage to environment/organisms?
• Why do atomic chain reactions not happen in nature?
• If you have a perfectly thermally insulated container and add equal amounts of liquid at 0C and 100C, does the thermal equilibrium always occur at 50C?
• Whats the possibility of gaining momentum by dry firing a bow in space?
• Does the probability of pregnancy change depending on the genetic distance between two human parents?
• Why are the edges of shadows fuzzy and not sharp?
• Why is it the energy levels in an infinite well have a spacing between them with a squared pattern, but in a harmonic oscillator they are linearly spaced? What is the physical meaning behind this?
• What gives stars their color?
• An empty refrigerator vs a full refrigerator - is there a difference in power usage?
• Can you reflect presumably a "Death Star" Laser using a simple mirror?

Why do airplanes need to fly so high? Posted: 15 Dec 2017 12:10 PM PST I get clearing more than 100 meters, for noise reduction and buildings. But why set cruising altitude at 33,000 feet and not just 1000 feet? Edit oh fuck this post gained a lot of traction, thanks for all the replies this is now my highest upvoted post. Thanks guys and happy holidays 😊😊 submitted by /u/peterthefatman [link] [comments]

Can light and sound affect each other? Posted: 16 Dec 2017 04:54 AM PST submitted by /u/super-hombre [link] [comments]

What happens when microwaves hits metal? Posted: 16 Dec 2017 03:45 AM PST I know as much as microwaves makes molecules vibrate, and certain objects heat up faster than other, due to amount of liquid? I also know that metals reflect the microwaves, but not why and what happens to the metal.. My real question.. would it be safe to crumble aluminum foil and put it on the bottom of a bowl filled with water/soup, to speed up the heating of the liquid? submitted by /u/Jerkalerka [link] [comments]

If we were able to accelerated a spaceship/probe to a fraction of the speed of light would space dust start punching tiny holes through it? Posted: 15 Dec 2017 02:22 PM PST It seems that at very high speeds even minute particles in space could become dangerous. Would this make some sort of shield a necessity? submitted by /u/HoboOperative [link] [comments]

How does binary convert into light waves in optical cables? Posted: 15 Dec 2017 07:35 PM PST submitted by /u/atomic_rectum [link] [comments]

Why do cable TV providers still need cable boxes which stream via coaxial cable? Posted: 15 Dec 2017 09:23 PM PST With the advent of Apple TV et al, as well as online viewing apps available from Spectrum (and I assume others), why haven't cable TV providers made their own IoT device that does the same thing as my cable box? And for that matter, why doesn't that functionality come built in to my TV? submitted by /u/real_namreeb [link] [comments]

How do we know the axial tilt and rotation of planets in our solar system? Posted: 15 Dec 2017 10:48 AM PST submitted by /u/sprtn757 [link] [comments]

Do men have hormonal cycles? Posted: 15 Dec 2017 06:10 AM PST And if so, what are they like and what causes them? Bonus: what effect does the moon have on hormonal cycles, both female and male? submitted by /u/DetainTheFranzia [link] [comments]

What is the meaningful distinction between nuclides and isotopes? Posted: 15 Dec 2017 12:31 PM PST I've read several different articles on this, talked to nuke engineers, and really just failed to receive a consistent and satisfactory answer. It almost seems like "nuclide" is a preferred term for the nukes while "isotope" is preferred by chemists. I understand very well the concept of elements, atomic masses, etc. I just want to make sure I'm using the correct terminology. For instance, is it proper to refer to U-238 as an isotope of uranium, or is U-238 a nuclide? I've heard the former but very rarely the latter. Are both valid? When would one be valid and the other not? Thanks submitted by /u/Kestrelio [link] [comments]

[PHYSICS] What other elements (Also hypothetical Elements e.g. Superactinoides) are in theory usable in atomic bombs and what would be their possible radioactive damage to environment/organisms? Posted: 15 Dec 2017 03:45 PM PST Hello! I hope I'm posting this in the right sub-reddit; if that's not the case I apologise. First off: I'd like to point out that this question is tied to me writing a fantasy/sci-fi book. So, accuracy of course would be great, but even "wild" theories are welcome! I just want to give some sort of explaination for what happens in my book instead of just far-fetching things and tell the reader "Oh well. It's just the way it is." Also my english is a bit rusty, so bear with me. Also I'm welcoming any other idea that revolves around a logical explaination for a radioactive infestation of the planet. To cut things short: Could it be possible to create a implosion type or gun-type atomic bomb with an undiscovered element or any other element except Uran/Plutonium? And if so: Is there one element that "infests" the environment for only 200-500 years? I read that Neptunium is a solid canidate to build atom bombs with and just due to historical events scientists chose not to work with this element. Book: New element found -> Crafty bomb -> Makes big boom -> Big scale enviromental desaster -> hello mutants -> yeay after ~250 years no more radiation! I know y'all probably fed up with "fallout scenarios" when it comes to literature, haha! Please help me out though. Thanks in advance guys! submitted by /u/Klavierente [link] [comments]

Why do atomic chain reactions not happen in nature? Posted: 15 Dec 2017 04:15 PM PST 1 in 100 or so Uranium atoms are U-235, which is the type of Uranium necessary to cause an atomic chain reaction. If a random neutron flying through a Uranium deposit hits U-235, wouldn't that risk the start of a fission chain reaction? If so, why prevents such reaction from happening in nature? submitted by /u/BackToAqaba [link] [comments]

If you have a perfectly thermally insulated container and add equal amounts of liquid at 0C and 100C, does the thermal equilibrium always occur at 50C? Posted: 15 Dec 2017 11:42 PM PST submitted by /u/dvdh8791 [link] [comments]

Whats the possibility of gaining momentum by dry firing a bow in space? Posted: 16 Dec 2017 03:20 AM PST submitted by /u/loblegonst [link] [comments]

Does the probability of pregnancy change depending on the genetic distance between two human parents? Posted: 15 Dec 2017 08:55 AM PST I understand that the greater genetic difference between two parents often results in hybrid vigor, making the offspring more genetically "fit". I've read studies that imply cancers are less likely, immunity to disease is better, and many other benefits when a human (and really, most other animals) is an offspring of genetically diverse parents. I was wondering, though, if that means there is some sort of trade off. Is the chance for pregnancy lower with "mixed race" couples than "same race"? Also (side question), does hybrid vigor tend to be more of a benefit post birth or have there been any studies that show genetic difference has an effect on reducing the chances of complications during pregnancy as well? TL,DR: Do pregnancies that benefit from heterosis have a better or worse chance of fertilization, or does it not matter? submitted by /u/MisterFlibble [link] [comments]

Why are the edges of shadows fuzzy and not sharp? Posted: 15 Dec 2017 09:01 AM PST submitted by /u/perceptio15 [link] [comments]

Why is it the energy levels in an infinite well have a spacing between them with a squared pattern, but in a harmonic oscillator they are linearly spaced? What is the physical meaning behind this? Posted: 15 Dec 2017 07:38 AM PST submitted by /u/-dog-will-hunt- [link] [comments]

What gives stars their color? Posted: 15 Dec 2017 11:16 AM PST I've heard a lot about stars having different colors like red giants or white dwarfs. From what I understand, a star is just a huge fusion reactor that fuses hydrogen to produce helium. What is different about these stars that changes the color? submitted by /u/jacpot19 [link] [comments]

An empty refrigerator vs a full refrigerator - is there a difference in power usage? Posted: 15 Dec 2017 08:54 PM PST All things equal besides content, if I had an empty refrigerator and I had a refrigerator full of beer would there be a difference in the amount of energy required to keep the refrigerator at the same temperature? submitted by /u/RGN_Preacher [link] [comments]

Can you reflect presumably a "Death Star" Laser using a simple mirror? Posted: 15 Dec 2017 01:25 PM PST submitted by /u/Autofarer [link] [comments]

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

Are the rocks in the asteroid belt between Mars and Jupiter the same kind of rocks you’d find on the earth?

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• Are the rocks in the asteroid belt between Mars and Jupiter the same kind of rocks you’d find on the earth?
• What is more energy saving? To connect a fully charged device to a power bank for it to keep it's battery full or to wait for the device's battery to deplete and then use the PW to charge it
• What is happening in the brain when you are struggling to remember something?
• How do traditional filament lightbulbs fail?
• Why is Paris warmer than Quebec City, despite being further north?
• Would it be possible to detect objects that are just outside the Observable Universe by the gravitational influence they would have on objects that are near the edge of the Observable Universe?
• How do GPS satellites handle so much data traffic?
• Do electrons exist at a specific place at a given time?
• Why are battery voltages selected at the values they are? What is special about 12, 5, or 3.7 volts?
• What effect does long-term exposure to darkness have on the senses?
• What does it take to leave the moons gravitational field?
• What are some of the tools used in big data management? What kind of analysis are to be done when analysts receive huge data dumps?
• How can temperature be negative?
• Are the reasons for grey matter reductions in brain during and after stressful life events documented?
• How similar are the Bengal Tigers and Sumatran Tigers genetically?
• Magnetic fields and electric fields are manifestations of the same phenomena. They are inherently related. Is there a duality that exists between the gravitational field and something else? Thank you.
• Has anyone proved how many colors you would need if you had a cube with an arbitrary number of three-dimensional regions in it so that no two bordering regions are the same color? It would be like the four color theorem but in three dimensions.
• How large does an object have to be for it's gravity to noticeably affect light?
• If matter and antimatter annihilate and the result is gamma rays, can we reverse engineer this?
• What is the AdS/CFT correspondence?
• How do gamma rays make bad whiskey smoother?
• How is the focal length of a gravitational lens determined?
• What are the reasons for the observed decline in brain volume over the course of the last 20000 years?

Are the rocks in the asteroid belt between Mars and Jupiter the same kind of rocks you’d find on the earth? Posted: 14 Dec 2017 03:47 PM PST submitted by /u/RedRedWine48 [link] [comments]

What is more energy saving? To connect a fully charged device to a power bank for it to keep it's battery full or to wait for the device's battery to deplete and then use the PW to charge it Posted: 14 Dec 2017 07:21 PM PST Edit: PB as in power bank, not PW submitted by /u/SootheAndHeal [link] [comments]

What is happening in the brain when you are struggling to remember something? Posted: 14 Dec 2017 01:49 PM PST submitted by /u/GloriousCow [link] [comments]

How do traditional filament lightbulbs fail? Posted: 14 Dec 2017 03:50 PM PST They have no moving parts, the filaments are protected from friction and corrosion ... what exactly is happening when they fail? What processes are involved? submitted by /u/Gargatua13013 [link] [comments]

Why is Paris warmer than Quebec City, despite being further north? Posted: 14 Dec 2017 09:46 AM PST submitted by /u/qmabs [link] [comments]

Would it be possible to detect objects that are just outside the Observable Universe by the gravitational influence they would have on objects that are near the edge of the Observable Universe? Posted: 14 Dec 2017 06:11 PM PST submitted by /u/Spounge84 [link] [comments]

How do GPS satellites handle so much data traffic? Posted: 15 Dec 2017 04:22 AM PST There has to be millions of people in a certain region using GPS at the same time.How do the satellites handle so much data and provide information to the user do quickly? submitted by /u/Cipher216 [link] [comments]

Do electrons exist at a specific place at a given time? Posted: 14 Dec 2017 07:29 PM PST I am having a difficult time getting a straight answer out of physicists for this question. I've been told by professors of physics and chemistry that an atom consists of a nucleus with electrons moving around it in orbitals and that we can't tell exactly where an electron is at any given time, we can only calculate the probability that an electron is in a given area at a specific time. Does this mean that the electrons don't exist at any specific place at a given time or is it just that we can tell where one is any given time. If it's just that we can't tell where one is at any given time but that they do exist at some specific place at any given time, is the reason we can't tell we they are just due to current technological limitations or is it believe that there are epistemological limitations to us ever being able to know where the electrons are at any given time regardless of how technologically advanced we become? submitted by /u/DeutscherLerner [link] [comments]

Why are battery voltages selected at the values they are? What is special about 12, 5, or 3.7 volts? Posted: 14 Dec 2017 07:42 PM PST submitted by /u/RobberBaron412 [link] [comments]

What effect does long-term exposure to darkness have on the senses? Posted: 14 Dec 2017 04:10 PM PST The senses I'm most curious about are sight, balance and Proprioception, though any information at all would be greatly appreciated :) submitted by /u/-GoddessAthena- [link] [comments]

What does it take to leave the moons gravitational field? Posted: 14 Dec 2017 12:58 PM PST So I just saw the recordings of the Apollo mission leaving the moon and it got me wondering: what does it take to leave the moons gravity compared to leaving earth's? The Apollo had to first have enough combustion to slow down and land and then leave again. I know the gravity on the moon is several times les powerful than on earth but still it does not make that much sense to me. If we look at space x just now being ready to land a rocket again. How did they do it back in the day AND make it take-off again? This probably makes me sound like conspiracy theorist, wich I'm not. I'm just genuinely wondering how this was possible back then. Here is the video btw: https://www.facebook.com/IFeakingLoveScience/videos/2015291808491820/ submitted by /u/Mdpablo [link] [comments]

What are some of the tools used in big data management? What kind of analysis are to be done when analysts receive huge data dumps? Posted: 15 Dec 2017 02:19 AM PST Im curious as to what kind of tools data scientists use to draw meaningful conclusions, other than the usual use of variance, mean and other common statistical tools a common high schooler will use. Any links to educate a data greenhorn like myself? submitted by /u/krankschaft [link] [comments]

How can temperature be negative? Posted: 15 Dec 2017 01:21 AM PST submitted by /u/rougesworstnightmare [link] [comments]

Are the reasons for grey matter reductions in brain during and after stressful life events documented? Posted: 14 Dec 2017 04:01 PM PST I mean for instance does prefrontal cortex lose grey matter due to some pruning mechanism of the brain ,due to excessive cortisol/glucocorticoids or some other reason? submitted by /u/Periplokos [link] [comments]

How similar are the Bengal Tigers and Sumatran Tigers genetically? Posted: 14 Dec 2017 05:59 PM PST I'm writing a paper on the similarities between different species of big cats and I've found this bit of information quite hard to track down. submitted by /u/Gaullic [link] [comments]

Magnetic fields and electric fields are manifestations of the same phenomena. They are inherently related. Is there a duality that exists between the gravitational field and something else? Thank you. Posted: 14 Dec 2017 09:17 PM PST submitted by /u/alextherob [link] [comments]

Has anyone proved how many colors you would need if you had a cube with an arbitrary number of three-dimensional regions in it so that no two bordering regions are the same color? It would be like the four color theorem but in three dimensions. Posted: 14 Dec 2017 12:31 PM PST submitted by /u/NikkyTesla [link] [comments]

How large does an object have to be for it's gravity to noticeably affect light? Posted: 14 Dec 2017 12:24 PM PST submitted by /u/Skrtmvsterr [link] [comments]

If matter and antimatter annihilate and the result is gamma rays, can we reverse engineer this? Posted: 14 Dec 2017 01:44 PM PST submitted by /u/Nerds_Galore [link] [comments]

What is the AdS/CFT correspondence? Posted: 14 Dec 2017 09:07 AM PST I know it deals with quantum gravity and quantum field theory, but can someone elaborate on this? As of 2015, Juan Maldacena's 1997 paper on the subject had over 10,000 citations, becoming the most highly cited article in the field of high energy physics. What was/is the significance of his paper? submitted by /u/generallyrelative [link] [comments]

How do gamma rays make bad whiskey smoother? Posted: 14 Dec 2017 11:10 AM PST I asked the same question on another subreddit, but I believe you can answer it in more depth, also I love physics (am currently studying biochemistry), so if you have any related facts, I'd love to hear them. I have read some articles on the internet that states if you irradiate bad whiskey with gamma rays, it will become much smoother. Also, if you irradiate cheap wine it loses it bitter aftertaste. You'd need about 200x the lethal dose for it to work. What is happening to the drink? Are all molecules afflicted by gamma radiation or just the less stable one's? Because it is neigh impossible create gamma rays without a particle accelerator or radioactive isotopes I thought would x-rays suffice, albeit having a lower energy than gamma rays, it is still ionizing radiation. All because making x-rays at home is (a bad idea) in the realm of possibilities thanks to ebay. Bonus fact: During my own "googling" to answer this question I stumbled upon this neat fact. Glass can be stained black by gamma rays, by heating it afterwards it becomes transparent again :) submitted by /u/Faultybrains [link] [comments]

How is the focal length of a gravitational lens determined? Posted: 14 Dec 2017 10:17 AM PST This question cropped up last weekend, and I had no idea how to solve it. Can somebody give me some pointers here, or point me to the right references? Thanks! submitted by /u/sw_dev [link] [comments]

What are the reasons for the observed decline in brain volume over the course of the last 20000 years? Posted: 14 Dec 2017 07:02 AM PST When asked I assumed it was due to the fact that we were witnessing an evolutionary process, that our brains were shrinking but becoming more efficient. But this doesnt seem to be the case. Furthermore I read that the decline in brai size is even more significant with women than men. Any solutions???? submitted by /u/wolfgertripathi [link] [comments]

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