How are drill bits that make drill bits made? And the drill bits that make those drill bits? |
- 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? [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:
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| Posted: 16 Dec 2017 12:02 PM PST |
| 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? [link] [comments]  |
| Posted: 16 Dec 2017 08:20 AM PST |
| 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. [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? [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? [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 [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? [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 [link] [comments]  |
| Do radioactive metals decay faster when molten? Posted: 16 Dec 2017 11:32 PM PST |
| 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? [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? [link] [comments]  |
| Posted: 17 Dec 2017 12:19 AM PST Why cannot appliances work on A.C. as the polarity change is very quick? [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? [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? [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 |
| 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? [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? [link] [comments]  |
| If two elements are combined, what happens to their individual half-lives? Posted: 16 Dec 2017 03:36 PM PST |
| 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. [link] [comments]  |
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