Why are Geese still flying south in the middle of winter?

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• Why are Geese still flying south in the middle of winter?
• What happens to lab rats that survive LD50 tests?
• What causes Triboluminescence, where sparks appear when glass or hardened sugar for example is shattered?
• What disease (if exist) the humans can transmit to cats?
• Is it possible to determine air temperature by sound?
• How do you reduce the sound of supersonic boom and make commercial supersonic flights feasible without generating too much pollution and noise?
• Why do we feel nauseous after getting hit in the head?
• Are bacteria more resistant to UV radiation than eukaryotes?
• Is a railgun chamber sealed up tight like a traditional firearm? If it is, does negative atmospheric pressure develop behind the projectile as it moves down the barrel? If it does, does it represent a problem or velocity limitation that has to be dealt with somehow? If so, how?
• Why do I only seem to hear about “upper” respiratory infections but never “lower” ones? Is there such a thing?
• On a bicycle, do fatter tires = more friction?
• Why does petroleum jelly help dry skin? Like how does it keep skin ‘moisturized’?
• When your rods are damaged, you see in black and white. What would you see in the opposite case?
• Did modern mammal lineage split before or after the KT-extinction event?
• Pregnancy Test - Why does the time needed to expose the stick differ for direct stream or placing it into a container full of urine? Direct stream is only for 5 seconds yet placing in a container is 20 seconds. Surely it should be the same, but it's not.
• BrainHQ brain training games : do they actually improve memory or do they just make you good at the games?
• What is more corrosive, something with pH 1 or 14?
• Is there a build up of sediment/material along subduction zones or is the entire plate and everything attached to it subducted?
• What is the closest thing in space where there is meaningful measurable red shift that is caused by the expansion of the universe?
• What is the standard procedure when a nuclear-powered vessel is lost at sea?
• Why are carbon emissions calculated per capita, not by the whole area of the country?
• Where did bed bugs live before humans invented beds?

Why are Geese still flying south in the middle of winter? Posted: 23 Jan 2019 05:08 PM PST I was outside a couple of days ago and there were hundreds of geese flying over Calgary Alberta. It's quite cold here so why are they flying en masse at this time of year? Edit: I know they're flying south because it's warmer. I want to know why there's so many flying south now when it has been cold for months already. submitted by /u/niqomi [link] [comments]

What happens to lab rats that survive LD50 tests? Posted: 24 Jan 2019 03:42 AM PST Presumably there are some that survive, are the survivors then exterminated, are the watched for more long-term effects, or are they "recycled" for tests involving different substances? submitted by /u/Koolaidguy541 [link] [comments]

What causes Triboluminescence, where sparks appear when glass or hardened sugar for example is shattered? Posted: 24 Jan 2019 07:24 AM PST submitted by /u/xxStefanxx1 [link] [comments]

What disease (if exist) the humans can transmit to cats? Posted: 24 Jan 2019 07:36 AM PST We commonly know that the cats can transmit Toxoplasmosis to humans, but in the oposite side: the humans can transmit something to cats? submitted by /u/hapynez [link] [comments]

Is it possible to determine air temperature by sound? Posted: 24 Jan 2019 05:41 AM PST It's currently quite cold outside (considerably below freezing), and the other day it occurred to me that the traffic and noise sounds different. Of course rubber compounds of cars' tires will be harder than usual, despite being winter tire compound, resulting in more and different noise. But it seemed like everything, people, birds, city noise and so on, sounded more... crisp. Is it possible that the air's compressibility or impedance changes with temperature that it somehow affects dispersion? Or is it density? Viscosity? You can gauge water temperature by the sound that it makes when pouring it out, so I would think that the same may apply to air. submitted by /u/Radioactdave [link] [comments]

How do you reduce the sound of supersonic boom and make commercial supersonic flights feasible without generating too much pollution and noise? Posted: 24 Jan 2019 05:56 AM PST I found many reports on NASA making supersonic quieter, but none of them explain exactly why and how. submitted by /u/Parabolica27 [link] [comments]

Why do we feel nauseous after getting hit in the head? Posted: 24 Jan 2019 07:35 AM PST submitted by /u/wolf_cat28 [link] [comments]

Are bacteria more resistant to UV radiation than eukaryotes? Posted: 23 Jan 2019 11:23 PM PST submitted by /u/Luke-P [link] [comments]

Is a railgun chamber sealed up tight like a traditional firearm? If it is, does negative atmospheric pressure develop behind the projectile as it moves down the barrel? If it does, does it represent a problem or velocity limitation that has to be dealt with somehow? If so, how? Posted: 23 Jan 2019 03:27 PM PST submitted by /u/screwyoushadowban [link] [comments]

Why do I only seem to hear about “upper” respiratory infections but never “lower” ones? Is there such a thing? Posted: 23 Jan 2019 05:35 PM PST Also, if they are a thing, what would a "lower" respiratory infection be in relation to an "upper" respiratory infection submitted by /u/dfsnerd [link] [comments]

On a bicycle, do fatter tires = more friction? Posted: 23 Jan 2019 09:05 PM PST Assuming same tread patterns. Bonus question: How much of an aerodynamic penalty is there with fatter tires? submitted by /u/Cool_Ranchu [link] [comments]

Why does petroleum jelly help dry skin? Like how does it keep skin ‘moisturized’? Posted: 23 Jan 2019 09:34 PM PST submitted by /u/ADTR20 [link] [comments]

When your rods are damaged, you see in black and white. What would you see in the opposite case? Posted: 24 Jan 2019 06:39 AM PST Are there people who have working only cones, but not rods? What does their image of the world look like? I was trying to simulate it in GIMP but then realized it's might not be possible to see the colors without the darkness - see https://www.google.cz/search?hl=en&gbv=2&dcr=0&tbm=isch&sa=1&ei=FJ6NWoTZOsSvkwW477eABw&q=rgb+channels&oq=rgb+channels&gs_l=psy-ab.3..0j0i24k1l3.62443.62680.0.62848.2.2.0.0.0.0.138.222.1j1.2.0....0...1c.1.64.psy-ab..0.2.221....0.5hvKS6sDot0#imgrc=Da0lKZFhijAy1M: submitted by /u/kyrgyzstanec [link] [comments]

Did modern mammal lineage split before or after the KT-extinction event? Posted: 24 Jan 2019 06:33 AM PST Obviously we know that the KT extinction event, famous for the extinction of the non-avian dinosaurs, opened up the ecological niches that mammals shortly thereafter evolved to fill, but do we have evidence that any two modern mammals had a MRCA that dates prior to this event? What evidence have we found (fossil, DNA, etc)? Or phrased differently, do all extant mammals share a MRCA post- or pre-KT extinction, and how did we discover this? submitted by /u/Arnistle [link] [comments]

Pregnancy Test - Why does the time needed to expose the stick differ for direct stream or placing it into a container full of urine? Direct stream is only for 5 seconds yet placing in a container is 20 seconds. Surely it should be the same, but it's not. Posted: 24 Jan 2019 04:45 AM PST submitted by /u/Tommetucker [link] [comments]

BrainHQ brain training games : do they actually improve memory or do they just make you good at the games? Posted: 23 Jan 2019 08:54 PM PST Scientific consensus on Memory Training Scientific consensus about brain training was that it just makes you good at the games you are playing. The skills won't reflect into improving real world skills. It won't even help improve closely related tasks. ​ For example if you practice a game where you remember a sequence of digits you will learn exactly that. It won't help you remember lyrics to a song or remember your shopping list. The company lumosity was fined by the FDA for false advertising. The company CogMed which was even recommended by psychologists earlier is now unheard of. ​ https://www.theguardian.com/technology/2016/jan/06/lumosity-fined-false-claims-brain-training-online-games-mental-health https://www.scientificamerican.com/article/brain-training-doesn-t-make-you-smarter/ https://www.newyorker.com/tech/annals-of-technology/brain-games-are-bogus ​ So, the common advice was that if you want to improve a specific skill. Eg: chess, programming, math, cooking etc. Just practice doing that instead. It will make you good at it. Brain training is a waste of time. ​ London Taxi Cab Study It is found that in London Taxi cab drivers the part in the hippocampus that involves remembering streets and directions became larger after several years in the profession. But overall hippocampus size was not changed. So, the improvement came at a cost of something else. ​ https://www.scientificamerican.com/article/london-taxi-memory/ https://www.bbc.com/news/health-16086233 ​ As would be expected, they were better at memory tasks involving London landmarks than the non-cabbies, but this advantage appeared to come at a price, as the non-cabbies outperformed them in other memory tasks, such as recalling complex visual information. ​ Posit Science and Professor Merzenich Then comes this new company called Posit Science (BrainHQ) ​ https://www.brainhq.com/welcome ​ This company is trying very hard to distance themselves from the likes of CogMed and Lumosity by claiming that their games are based on actual science. The main scientist involved in this is Michael Merzenich. Reading his bio it's evident that he is really a very distinguished neuroscientist in the scientific community. ​ https://en.wikipedia.org/wiki/Michael_Merzenich https://www.cogmed.com/ ​ Criticism of their claims to improve attention Double Decision A study they site most often is the ACTIVE study. It made participants play a game called Double Decision. A vehicle pops up in the center of the screen. At the same time a sign appears at the edge of the screen. Then you are given two vehicles out of which you have to select the one that appeared at the center and also pick the spot where the sign appeared. It trains you to focus at two things at the same time. The study claims that in the portion who played the game car accidents where the person is at fault reduced by around 40%. ​ https://www.brainhq.com/world-class-science/published-research/active-study https://www.brainhq.com/why-brainhq/about-the-brainhq-exercises/attention/double-decision ​ Criticism of their claims to improve memory. For games that claim to improve things like memory I didn't find any such long term studies. And I don't feel how they are any different from the ones from Lumosity and Cogmed. I will explain this with some example games. ​ To-Do List Training You hear a audio recording. "Pick up the hammer , then the saw, and then the mat..." "Once you pick up the mat, then pick up the ball and the screw.." You have to remember this and press on buttons corresponding the items. https://www.brainhq.com/why-brainhq/about-the-brainhq-exercises/memory/do-list-training ​ The items to remember are the same when the game progress. So how do we know that simply we get good at remembering these specific items. For example what I do is I forget the sentences and remember the items only. hammer, saw, mat... So, this games makes me good at remembering a series of words. ​ Syllable Stacks Same as above but with sounds instead of sentences. https://www.brainhq.com/why-brainhq/about-the-brainhq-exercises/memory/syllable-stacks ​ Memory Grid There are cards when you click on one you hear a sound. You have to match the cards with the same sound. A variation of this game was there in my black and white nokia 1100 15 years ago. https://www.brainhq.com/why-brainhq/about-the-brainhq-exercises/memory/memory-grid Similar criticism as above. ​ Scene Crasher You are shown items on the table for a brief time. Then it's shown again. You have to pick the item that was not there the first time. https://www.brainhq.com/why-brainhq/about-the-brainhq-exercises/memory/scene-crasher ​ What I do is I remember a pattern in which the items appear. In the second image I see if the pattern is deviated. Sometimes it's just a hunch. How often a scenario like this have any practical application? Someone shows me a picture or a board with text and immediately after shows me another similar one and asks me to spot the difference? ​ So, in these games I don't see how you are not just improving in the game. You get good at remembering a combination of same words. You get good at remembering a combination of some sounds. You get good at finding which item was missing from a picture. ​ Final thoughts on BriainHQ As most people I trust scientific opinion. Reputation of Professor Merzenich is crucial factor for me to give BrainHQ a try. Once my psychologist suggested CogMed but because of lack of evidence I was very keen on it. Those companies prey on the vulnerable people desperate to improve their cognitive function. Tricking them into thinking they are improving when they are just getting good at the game. ​ I thought BrainHQ was different and actually based on science. My main focus is to improve both my long term and short term memory. I'm a programmer by profession and it would really help me if I could do this. Learn new technologies faster. Remember a function I read in a different file 10 seconds ago etc. ​ I admit that the ACTIVE study looks legitimate. But it is about a game out of their 20 other games. But it feels disingenuous to use this to push other games that promises to improve other faculties like memory. Games that might not have the same evidence. ​ So, am I wasting time and money on this trying to improve my memory? Am I better off with just learning programming in that time. ​ I hope a scientist working for BrainHQ sees this and is able to clarify my doubts and concerns. submitted by /u/enzio901 [link] [comments]

What is more corrosive, something with pH 1 or 14? Posted: 23 Jan 2019 02:10 PM PST submitted by /u/Asus123456789 [link] [comments]

Is there a build up of sediment/material along subduction zones or is the entire plate and everything attached to it subducted? Posted: 23 Jan 2019 07:15 PM PST For example, imagine an oceanic plate in a tropical region abundant with reefs/corals subducting underneath a neighboring continental plate. Does all of that reef material and surface sediment that has not been lithified get subducted as well, or is there evidence of it "scraping" (for lack of a better term) off the top of the subducted oceanic plate and building up against the continental plate above the actual boundary where subduction occurs? What do these places where subduction actually occurs look like? submitted by /u/nervous-cat [link] [comments]

What is the closest thing in space where there is meaningful measurable red shift that is caused by the expansion of the universe? Posted: 23 Jan 2019 11:35 PM PST submitted by /u/WhyContainIt [link] [comments]

What is the standard procedure when a nuclear-powered vessel is lost at sea? Posted: 24 Jan 2019 03:01 AM PST Beyond the obvious rescue of the crew if possible, is anything done to contain/recover the radioactive materials from the reactor(s)? A friend and I were discussing this, and we aren't really sure. If this isn't the right sub, feel free to point me in the right direction. submitted by /u/Shock_Hazzard [link] [comments]

Why are carbon emissions calculated per capita, not by the whole area of the country? Posted: 24 Jan 2019 02:26 AM PST Are there any scientifically proven reasons behind calculating the total amount of yearly emissions per capita, not by land area? submitted by /u/elpatricio96 [link] [comments]

Where did bed bugs live before humans invented beds? Posted: 23 Jan 2019 01:03 PM PST submitted by /u/1969-InTheSunshine [link] [comments]

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Why isn't dopamine a recreational drug?

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• Why isn't dopamine a recreational drug?
• Why do we sometimes confused feeling cold with feeling wet?
• How are the aluminum compounds in antiperspirants effective in blocking sweat production? What is unique about their acid/base properties that help them do this?
• Do we actually know were the center of the universe is located? Do we know where we are in the entire universe?
• Are there (according to science) different human races?
• CO2 levels above 945ppm, a normal rate in indoor environments, have been shown to reduce cognitive function by 15%. What is the most efficient way CO2 can be removed from indoor air in situations where ventilation is not feasible?
• Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
• What criteria must be met to trigger the Placebo Effect?
• How confident are we about the link between exercising earlier or later in the day and it's affect on the circadian rhythm i.e. that vigorous exercise later in the day is disruptive to the CR?
• Do incandescent lightbulbs fail because the vacuum leaks, causing the filament to burn or because the filament itself fails due to multiple cycles of heating and cooling?
• Do non-UV absorbing intraocular lenses exist?
• Why is U–Pb dating so effective in measuring the age of the Earth? Wouldn't there be decaying uranium floating around the early Solar System, or even *before* the formation of the Sun during the nebula stage?
• Do all solids have a melting point?
• What does "a faster metabolism" exactly mean?
• Why is it that liquids can multiply force but solids can't?
• Does cell damage occur when an injection is given? What causes the pain or discomfort?
• By my understanding, electromagnetic forces and gravitational forces behave rather similarly, yet electromagnetic forces can both attract and repel while gravity can only attract. Is it possible to have a "negative" gravitational field, one that repels?
• Why do only UV rays tan skin? Why not other things that burn you?
• How do we know what the gene sequence is for a protein when we discover a new protein?
• Does light make a sound (in a medium)?

Why isn't dopamine a recreational drug? Posted: 22 Jan 2019 03:40 PM PST From what I understand, drugs like meth and cocaine are addictive because they cause a sharp increase of dopamine within the brain. What is stopping someone from injecting themselves with dopamine to get high? submitted by /u/bayandsilentjob [link] [comments]

Why do we sometimes confused feeling cold with feeling wet? Posted: 22 Jan 2019 03:34 PM PST submitted by /u/giraffeman3705 [link] [comments]

How are the aluminum compounds in antiperspirants effective in blocking sweat production? What is unique about their acid/base properties that help them do this? Posted: 23 Jan 2019 05:19 AM PST - Aluminum chloride - Aluminum chlorohydrate - Aluminum hydroxybromide submitted by /u/CavsFirstRoundExit [link] [comments]

Do we actually know were the center of the universe is located? Do we know where we are in the entire universe? Posted: 22 Jan 2019 08:27 PM PST submitted by /u/Tommy099431 [link] [comments]

Are there (according to science) different human races? Posted: 23 Jan 2019 12:37 AM PST Disclaimer: I have no intention to receive answers which justify racism or a hierarchy of races. All people are worth the same. I am not a native english speaker. Question: Is there scientific proof of different human races? If not, what is the difference between, for example Asian and African people called? Is it correct to compare human distinctions with animal distinctions (i.e. Dogs —> Labrador vs. Shepherd)? I am looking forward to a fact based discussion. submitted by /u/x_ben_dover_x [link] [comments]

CO2 levels above 945ppm, a normal rate in indoor environments, have been shown to reduce cognitive function by 15%. What is the most efficient way CO2 can be removed from indoor air in situations where ventilation is not feasible? Posted: 22 Jan 2019 10:41 AM PST Study Referenced: https://ehp.niehs.nih.gov/doi/pdf/10.1289/ehp.1510037 Cognitive function scores were 15% lower for the moderate CO2 day (~ 945 ppm) and 50% lower on the day with CO2 concentrations of ~1,400 ppm than on the two Green+ days (Table 5, dividing the average Green+ estimate by the moderate CO2 and high CO2 estimates, respectively). Are algae scrubbing setups an efficient solution to converting the CO2 in the air into O2? edit: I should clarify that I'm looking at solutions an individual can use in their home. submitted by /u/academicpursuit [link] [comments]

Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Posted: 23 Jan 2019 07:12 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Biology, Chemistry, Neuroscience, Medicine, Psychology Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! submitted by /u/AutoModerator [link] [comments]

What criteria must be met to trigger the Placebo Effect? Posted: 23 Jan 2019 05:56 AM PST For example if I were to take a headache placebo is it my immediate believe in taking the pill that cures my pain(cures pain right after taking the pill because I associate the pill with healing) or is it the long term believe that is constantly in the back of my head like "the pill will make it better" that cures my pain. What I'm asking is, how do you define believe and what criteria must be met to trigger the Placebo effect? submitted by /u/bushworldadventures [link] [comments]

How confident are we about the link between exercising earlier or later in the day and it's affect on the circadian rhythm i.e. that vigorous exercise later in the day is disruptive to the CR? Posted: 23 Jan 2019 05:27 AM PST For instance on the wiki page about Delayed Sleep Phase Disorder, it quickly mentions that exercise early in the day is beneficial to the maintenance of a regular CR, implying that exercise later in the day is likely not. ​ Link. submitted by /u/HD_Thoreau_aweigh [link] [comments]

Do incandescent lightbulbs fail because the vacuum leaks, causing the filament to burn or because the filament itself fails due to multiple cycles of heating and cooling? Posted: 23 Jan 2019 05:52 AM PST submitted by /u/amazingly_ignorant [link] [comments]

Do non-UV absorbing intraocular lenses exist? Posted: 22 Jan 2019 11:46 PM PST I just learned about how Monet was able to see UV lights when he got his crystalline removed. And now it fascinates me. I was wondering if non-UV absorbing intraocular lenses existed? So intraocular lenses so you can see clearly again, but non-UV absorbing so you can still see UVs. Are they dangerous? submitted by /u/Exella [link] [comments]

Why is U–Pb dating so effective in measuring the age of the Earth? Wouldn't there be decaying uranium floating around the early Solar System, or even *before* the formation of the Sun during the nebula stage? Posted: 22 Jan 2019 10:13 PM PST submitted by /u/wizfactor [link] [comments]

Do all solids have a melting point? Posted: 22 Jan 2019 07:45 PM PST submitted by /u/Carrico1 [link] [comments]

What does "a faster metabolism" exactly mean? Posted: 22 Jan 2019 03:07 PM PST So all my life I've been a really skinny guy. I'm usually around 62-64kg and I have never really cared about what I eat, as in not once counted calories, going for the "lighter" options, or even looking for healthier alternatives, so to me it's mind boggling to see all the people that struggle trying to lose weight, going on really strict diets, etc.. The most I've weighted in my life I believe was around 68 kilos, and that was because I was actively trying to gain weight, crossfit 3 times a week, protein shakes, etc., and it only took me a couple of months of not working out to lose all of it. Usually when I wonder why is it so hard for me to gain weight while it is so easy for other people, the answer is pretty much "it's because you have a faster metabolism", and they leave it at that. What does it exactly mean? Can that be changed over time? It's not like I'm going to the bathroom every couple hours either (or even daily tbh), so I don't even understand where is all the food stored and how exactly is it disposed of as opposed to it being transformed to fat and stored (which I'm pretty sure it isn't). Also I recently read that people only share about 10% of the microbial life inside them, is that related to my question? submitted by /u/awooten [link] [comments]

Why is it that liquids can multiply force but solids can't? Posted: 22 Jan 2019 11:09 PM PST I understand it mathematically using the displacement of liquid and conservation of energy, but I can't intuitively see why a piston with liquid is able to multiply the force. If I can lift a "heavy force" with a light force, then somewhere there must be an imbalance in the piston, right? Why isn't there some net acceleration on the pistons if the forces are imbalanced? I've been reading some explanations that say water is generally incompressible, but wouldn't that hold for solid steel as well? submitted by /u/yosimba2000 [link] [comments]

Does cell damage occur when an injection is given? What causes the pain or discomfort? Posted: 23 Jan 2019 12:12 AM PST submitted by /u/Bespok3TV [link] [comments]

By my understanding, electromagnetic forces and gravitational forces behave rather similarly, yet electromagnetic forces can both attract and repel while gravity can only attract. Is it possible to have a "negative" gravitational field, one that repels? Posted: 22 Jan 2019 09:08 PM PST submitted by /u/Lil_Mozart [link] [comments]

Why do only UV rays tan skin? Why not other things that burn you? Posted: 23 Jan 2019 02:42 AM PST submitted by /u/DirtyWogBoy [link] [comments]

How do we know what the gene sequence is for a protein when we discover a new protein? Posted: 22 Jan 2019 08:29 PM PST Say we find a protein, and we don't know what it does or what the gene is or where it's located. I know we can sequence the amino acid sequence via a few methods like mass spectrometry or Edman degradation, but since there are wobble pairs, how do we find where the gene for this new protein is located and what that gene sequence actually is? submitted by /u/roweira [link] [comments]

Does light make a sound (in a medium)? Posted: 22 Jan 2019 11:26 PM PST In my very surface level understanding of the physics of photons, I know that photons have no mass but still have momentum that can be transferred to other particles. If enough photons interact with a medium, could it generate compression waves and be registered as sound? To be specific, I don't mean signal transformations like radio waves where signals are coded and decoded. And would there be any correlation between the frequency of the light and the frequency of the sound? (If any part of this post sounds weird, it could be because the question came to me as I was trying to go to sleep. But, it could also be that I have no idea what the hell I'm talking about.) Anyway, thank you and I'm looking forward to the responses! :D submitted by /u/Abadoss [link] [comments]

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What happens in the brain in the moments following the transition between trying to fall asleep and actually sleeping?

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• 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?

What happens in the brain in the moments following the transition between trying to fall asleep and actually sleeping? Posted: 22 Jan 2019 03:53 AM PST submitted by /u/Riftus [link] [comments]

Are film clips still "moving pictures" when recorded and stored digitally, or does the recording of a digital video work differently from analogue recording? 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. submitted by /u/Choral [link] [comments]

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? Posted: 22 Jan 2019 07:21 AM PST submitted by /u/Throwaway565463 [link] [comments]

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? submitted by /u/im_mobile [link] [comments]

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? Posted: 22 Jan 2019 05:51 AM PST submitted by /u/tbone985 [link] [comments]

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? Posted: 22 Jan 2019 07:16 AM PST submitted by /u/ALostPaperBag [link] [comments]

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? 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. submitted by /u/Wobbles42 [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! submitted by /u/fuckwatergivemewine [link] [comments]

Are neutrons evenly distributed inside a nucleus, or is there a density gradient? Posted: 21 Jan 2019 05:37 PM PST submitted by /u/Thrownawaybyall [link] [comments]

When your heart "skips a beat" - does it? Posted: 21 Jan 2019 01:43 PM PST What is happening when your heart "skips a beat"? submitted by /u/Gaymface [link] [comments]

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? submitted by /u/AhmedFakeih [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? submitted by /u/Hammerang [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! submitted by /u/cinemojo [link] [comments]

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? Posted: 21 Jan 2019 07:34 PM PST submitted by /u/Sirteen [link] [comments]

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? submitted by /u/pawroulette [link] [comments]

Can you perform the double slit experiment with VLF radio waves, would the slits and detector wall need to be huge? Posted: 21 Jan 2019 09:02 PM PST submitted by /u/BearItChooChoo [link] [comments]

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. submitted by /u/blackhawk1819 [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 submitted by /u/meoe [link] [comments]

How come sodium (Na) and Potassium (K) have such different equilibrium potentials within a neuron, but they're very similar atoms? 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. submitted by /u/SaneImpala [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)? submitted by /u/maxop001 [link] [comments]

How does white vinegar neutralise odors? Posted: 22 Jan 2019 12:19 AM PST submitted by /u/oj109 [link] [comments]

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