What exactly is happening to your (nerves?) when circulation gets cut off and you start to tingle? |
- What exactly is happening to your (nerves?) when circulation gets cut off and you start to tingle?
- At what point is a particle too small to cast a shadow?
- How do most wild animals die?
- What do scientists mean when they say "We only know what makes up 5% of the Universe"? What makes up the other 95% of the Universe and how come we don't know what it is ?
- Is there a way to measure sharpness - like a scale of sharpness? Thank you
- What prevents people in the United States from contacting Malaria from mosquito bites?
- When I drop an insect (I.e an ant) from a large height (relative - from my chest to the ground), does it “hurt” as bad as it would for us?
- If electrons move in a copper wire not by each electron travelling all the way, but by bumping into the one ahead and pushing it forward, how can electricity travel faster than the speed of sound of copper?
- Why does tungsten (and the elements around it) have a high melting point?
- What is the Furry hypothesis, in relation to quantum superposition, and why is it incorrect?
- How is a breathalyzer a useful metric when testing blood alcohol content?
- What is the aspect ratio of a nuclear reactor and why does it matter?
- Can gases/liquids be contained within a magnetic field?
- Why will your eyes hurt looking at the sun, but not at a lightning strike?
- Is there a limit to the number of photons a human iris/brain can capture and process?
- Why does diabetes causes kidney damage?
- Does the age of sperm affect the offspring it creates?
- Do extroverts comment more often than introverts on Reddit?
- Why are converging-diverging nozzles preferred over converging only nozzles?
| What exactly is happening to your (nerves?) when circulation gets cut off and you start to tingle? Posted: 21 Jan 2018 06:10 AM PST |
| At what point is a particle too small to cast a shadow? Posted: 20 Jan 2018 08:38 AM PST |
| Posted: 20 Jan 2018 07:08 PM PST Setting aside insects and microscopic organisms, how does the average, say, gazelle die? Killed by a predator? Disease (what kind of diseases, cancer?)? Accident? Or something else? [link] [comments]  |
| Posted: 20 Jan 2018 06:56 PM PST |
| Is there a way to measure sharpness - like a scale of sharpness? Thank you Posted: 20 Jan 2018 01:48 PM PST |
| What prevents people in the United States from contacting Malaria from mosquito bites? Posted: 20 Jan 2018 07:07 PM PST I read about the malaria eradication project from the 1940's, but how does lowering mosquito populations alone prevent the disease from spreading? Sorry if this seems like a stupid question. [link] [comments]  |
| Posted: 20 Jan 2018 03:51 PM PST |
| Posted: 20 Jan 2018 08:16 PM PST According to this article, individual electrons move slower than a snail, and the rapid speed of electricity is because "electrons are packed in so tightly that even a small movement will travel down the wire from electron to electron at an impressive speed, letting you turn on the lights without having to wait for electrons to travel the whole way there." However, the speed of sound in copper is about 4.6 km/s, yet electricity can travel up to 2/3 the speed of light, about 200,000 km/s. I always thought that propagation due to matter bumping into each other (much like sound waves in an atmosphere) cannot travel faster than the speed of sound in that medium, since the speed of sound is essentially a measurement of how quick a material is to react to, and propagate, compression. [link] [comments]  |
| Why does tungsten (and the elements around it) have a high melting point? Posted: 20 Jan 2018 04:22 PM PST Why does tungsten and the elements around it have a high melting point? My understanding of chemistry is quite good, I understand everything for a first or second year chemistry university student. I also understand harder concepts like how special relativity is involved in the lathinade contraction. If you include anything of extremely high level in your answer, can you please explain it thoroughly or provide a link. [link] [comments]  |
| What is the Furry hypothesis, in relation to quantum superposition, and why is it incorrect? Posted: 20 Jan 2018 01:17 PM PST More specifically, I've come across an example for a hypothetical physics experiment that highlights an aspect of quantum superposition (the book makes short reference to the Furry hypothesis but doesn't really go into detail with it). In the experiment, a source sends out a pair of entangled photons to two detectors that measure the incoming light. Both detectors are equidistant from the source such that they should receive their individual photon simultaneously. Each detector is equipped with a controllable polarized beam splitter (with three potential positions: +30, 0, -30 degrees) that separates the incoming light into vertically and horizontally polarized light. When both detectors have the same polarization in their beam splitters, the results measured by the detectors are correlated. The text first suggests the following (incorrect) hypothesis: if both polarizers have the same orientation, the detectors return the same result. If the polarizers have different orientations, the detectors don't get the same result. Is this the Furry hypothesis or just a common thought experiment to introduce superposition? [link] [comments]  |
| How is a breathalyzer a useful metric when testing blood alcohol content? Posted: 20 Jan 2018 08:35 AM PST |
| What is the aspect ratio of a nuclear reactor and why does it matter? Posted: 20 Jan 2018 08:16 AM PST I've been reading about nuclear fusion and its limitations and a word that keeps coming up is the "aspect ratio". I believe it has something to do with the size of the area confined by the magnets but I'm not exactly sure because googling it is bringing me to journals I can't really understand... According to Wikipedia the aspect ratio is "the limiting factor in reducing the beta size" which has confused me even more because I thought beta was supposed to be as big as possible in these reactors? Although there's no sites so not really sure if that statement was accurate. Anyhow if anyone had an information on this it would be greatly appreciated :-) [link] [comments]  |
| Can gases/liquids be contained within a magnetic field? Posted: 20 Jan 2018 02:20 PM PST I am curious about this. Anyone know if this is possible? [link] [comments]  |
| Why will your eyes hurt looking at the sun, but not at a lightning strike? Posted: 20 Jan 2018 08:22 AM PST |
| Is there a limit to the number of photons a human iris/brain can capture and process? Posted: 20 Jan 2018 08:42 AM PST If I stand at the top of a hill I can see for miles. I can make out individual trees, buildings, clouds, fences, animals and anything else In a mind boggling volume. Is there a limit that i can take in? Am I thinking the wrong way about it again? [link] [comments]  |
| Why does diabetes causes kidney damage? Posted: 20 Jan 2018 07:35 PM PST |
| Does the age of sperm affect the offspring it creates? Posted: 20 Jan 2018 10:27 AM PST NOT to be confused with the age of the father, or how the age of the sperm affects its the fertility, I would like to know if the age of the sperm has any effect on the offspring it creates. Specifically in humans. I have a hard time imagining there is even reliable research that has been conducted on this question, but it's something I've long been curious about. Logically it seems to me that there would be an optimal window after the most recent ejaculation to conceive the healthiest child. [link] [comments]  |
| Do extroverts comment more often than introverts on Reddit? Posted: 20 Jan 2018 03:10 PM PST More generally, I am interested whether there is any good scientific research on personality types (Big 5) and correlations with social media usage and leaving comments. I could imagine it going either way, i.e., people who talk more in normal life also leave more comments online, or oppositely, people who feel inhibited in normal life make up for it by commenting more online. [link] [comments]  |
| Why are converging-diverging nozzles preferred over converging only nozzles? Posted: 20 Jan 2018 08:23 AM PST This is a general fluid mechanics question. I know that converging-diverging nozzles are preferable to converging only, especially in aerospace applications. I just can't remember the specific mechanisms as to why. In addition, can you have Mach greater than 1 in a converging nozzle? If anyone can provide some further explanations, I would greatly appreciate it! [link] [comments]  |
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