What happens in the brain in the moments following the transition between trying to fall asleep and actually sleeping? |
- What happens in the brain in the moments following the transition between trying to fall asleep and actually sleeping?
- Are film clips still "moving pictures" when recorded and stored digitally, or does the recording of a digital video work differently from analogue recording?
- For those with ASD, can people move along the spectrum as they age? Can people become higher- or lower-functioning as time goes on, and if so, which has been seen to be more common?
- Do any non-human species exhibit the concept of familial inheritance of either property or position?
- I’ve heard some cosmologists say the universe may be infinite. How can this be if there has not been an infinite amount of time since the Big Bang?
- It is very windy in LA right now, and while driving, my cars radio is extremely staticky, my question is, do heavy winds cause radio stations to have weaker signals?
- Does drilling into deep Antarctic lakes (or any isolated environment) present an elevated risk of reintroducing a disease to existing environments? Do the people doing this work need to take precautions beyond what is usually required with sampling any other environment?
- Equivalent of Witt's theorem but for over-complete sets of vectors?
- Are neutrons evenly distributed inside a nucleus, or is there a density gradient?
- When your heart "skips a beat" - does it?
- Why is it (n) and not (the square root of n) in the variance formula?
- Does the loudness and/or frequency of a sound change its speed of travel?
- Is Earth extremely rare to have a perfect Solar Eclipse and Lunar Eclipse?
- Why does the moon appear red during a lunar eclipse and dark during a new moon? Does the moon also appear red during a solar eclipse?
- How does THC affect blood circulation?
- Can you perform the double slit experiment with VLF radio waves, would the slits and detector wall need to be huge?
- Is it possible to determine the location where an image was taken using spherical geometry? How?
- When dogs detect cancer in humans, how do they know that it’s a bad thing?
- How come sodium (Na) and Potassium (K) have such different equilibrium potentials within a neuron, but they're very similar atoms?
- What is the most efficient way to cross out a Barcode?
- How does white vinegar neutralise odors?
| Posted: 22 Jan 2019 03:53 AM PST |
| Posted: 22 Jan 2019 06:52 AM PST I put computing as flair, but I'm honestly not sure in which category this belongs. Feel free to mark it with more appropriate flair, admins. [link] [comments]  |
| Posted: 22 Jan 2019 07:21 AM PST |
| Do any non-human species exhibit the concept of familial inheritance of either property or position? Posted: 22 Jan 2019 05:40 AM PST Several non-human species (e.g. certain birds, rats, and primates) seem to have a sense of property. Many species have hierarchical social structures, in which certain individuals are considered dominant or superior to others. Are there any species in which the offspring of a deceased individual "inherit" either their property or their social position? Or does such property merely become "fair game," and social position is rearranged to promote the next individual in the "pecking order," regardless of genetic lineage? In other words, is familial "inheritance" of property or position an entirely human construct? [link] [comments]  |
| Posted: 22 Jan 2019 05:51 AM PST |
| Posted: 22 Jan 2019 07:16 AM PST |
| Posted: 22 Jan 2019 01:23 AM PST I read recently about the samples taken from the very deep lake in the Antarctic. I often hear about diseases being devestating to isolated populations. I'm curious whether this can work in reverse. Do long isolated habitats represent a hazard to the biosphere at large? I don't mean to be in any way alarmist. I am just genuinely curious whether work like this carries any exotic hazards, or if a sample of lake water from under a kilometer of ice is just another sample of lake water. [link] [comments]  |
| Equivalent of Witt's theorem but for over-complete sets of vectors? Posted: 22 Jan 2019 06:29 AM PST Hi! I've been trying to prove this or find a counter-example but with no success yet, I also started going over the literature but I couldn't quite tell if the results I found there would be useful for me or not. So thanks for any help or any useful references! Here's my scenario: I have a d-dimensional vector space X over a finite field of odd characteristic, it's equipped with a symmetric bilinear form B( - , - ). I have two sets of n vectors each: V={v_1, ..., v_n} and U={u_1, ..., u_n} where n>d, where dim( span V ) = dim( span U ) < d, and these vectors satisfy that B( v_i , v_j ) = B( u_i, u_j). Can I say that there is a linear transformation L which preserves B( , ) such that L u_i = v_i for all i? This would be an extension of Witt's theorem but for over-complete sets of vectors. Thanks so much in advance! [link] [comments]  |
| Are neutrons evenly distributed inside a nucleus, or is there a density gradient? Posted: 21 Jan 2019 05:37 PM PST |
| When your heart "skips a beat" - does it? Posted: 21 Jan 2019 01:43 PM PST |
| Why is it (n) and not (the square root of n) in the variance formula? Posted: 22 Jan 2019 07:08 AM PST From my understanding, the variance is the squared average differences from x-bar (the mean). I also understand that the reason quantities are squared in the numerator is for a mathematical reason, not a statistical one, that is to avoid any possible negative values. My question is, why isn't the formula: the summation of squared differences over n2 instead of n? I feel that it is unproportional to divide a quantity squared by unsquared sample size. In other words, it perhaps seems like a distortion. Another way to look at it is that in standard deviation when we take the square root of the numerator we revert the quantities to their initial units, yet we also take the square root of (n) which, again, changes its meaningful representation as the sample size, thus unproportional again. Can someone kindly explain why is that? [link] [comments]  |
| Does the loudness and/or frequency of a sound change its speed of travel? Posted: 22 Jan 2019 03:00 AM PST I know the medium changes its speed, like the difference between speed through air and speed through water, but does the loudness or frequency change anything in regards of speed? [link] [comments]  |
| Is Earth extremely rare to have a perfect Solar Eclipse and Lunar Eclipse? Posted: 21 Jan 2019 04:55 PM PST What are the chances that the size of a planet is just perfect enough to eclipse it's moon just right, and the size of the moon (relative to that planet) is just right to eclipse it's sun resulting in perfect eclipses? I am not advocating for creationism or "intelligent design", but am actually genuinely curious. Thank you! [link] [comments]  |
| Posted: 21 Jan 2019 07:34 PM PST |
| How does THC affect blood circulation? Posted: 21 Jan 2019 04:35 PM PST Hello, /askscience! I've always wondered why THC caused red eyes and blushy face. I know the endocannabinoid system has an effect over peripheral circulation, but I can't find any article that says how. The only good thing explained that i can find is how THC causes its mental effects, which is through binding with GABA producing neurons which regulate a great lot of neurons (as dopamine and serotonin producing neurons, thought processing neurons and such). I can't either find how does it affect saliva production, intraocular pressure and heart rate, but I guess those are another question haha. What do you know about this? [link] [comments]  |
| Posted: 21 Jan 2019 09:02 PM PST |
| Is it possible to determine the location where an image was taken using spherical geometry? How? Posted: 22 Jan 2019 12:23 AM PST Is it possible to find out where a image was taken only knowing the time it was taken, object height and shadow height? I wondered because there was a scene in the movie "G.I. Joe" where the good guys found the villain's secret base only having a picture of him standing in sun light. [link] [comments]  |
| When dogs detect cancer in humans, how do they know that it’s a bad thing? Posted: 22 Jan 2019 03:06 AM PST |
| Posted: 21 Jan 2019 08:50 PM PST This could apply to any cell, not just neurons. I've gone my whole life just accepting that potassium likes to go out of cells and sodium likes to go into cells, but never really understood why. Potassium has an equilibrium potential at - 90 mV in a resting neuron, but sodium has one at + 60 mV. [link] [comments]  |
| What is the most efficient way to cross out a Barcode? Posted: 22 Jan 2019 01:07 AM PST How can I invalidate a barcode with just a black ballpen with the minimum amount of strokes? Perpendicular/diagonal/parallel lines? Is the position relevant? And why is it (not)? [link] [comments]  |
| How does white vinegar neutralise odors? Posted: 22 Jan 2019 12:19 AM PST |
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