Is it possible to feel "high" without using drugs?

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• Is it possible to feel "high" without using drugs?
• Why could I only see out of one lens in the 3D cinema where as my SO could see out of both?
• Does radiation stay close to the ground, rise, or go everywhere ? For example would it be "safe" to be inside a canyon or on top of a building ?
• Other than light, what is the fastest thing we have ever observed?
• Why do people put salt on icy roads?
• How can near-infrared light detect veins in a person's skin?
• Do blind animals still turn their heads to stare at sudden noises?
• Why is it that while experiencing multiple days of intense sleep deprivation, I begin to lose my ever-persisting bout of anxiety and feel a melancholic sense of well-being?
• We can be both too cold and too hot for homeostasis, why does being cold seem to cause more sickness?
• Where do the emitted photons go when we switch frames for a charged particles falling in a gravitational field?
• Why is the speed of light 299 792 458 m/s in a vacuum? Why not faster or slower?
• If a person is born without all senses would they have any experience?
• Why do thylakoids form stacks within the chloroplast?
• Why does visible light not cause eye damage?
• Doesn't the no-communication theorem directly conflit this article from stanford?
• Why do we lose consciousness when exposed to high levels of radiation?
• What physical differences allow one CPU to be faster than other at the same clock speed?

Is it possible to feel "high" without using drugs? Posted: 26 Nov 2015 06:15 PM PST submitted by Veshter [link] [346 comments]

Why could I only see out of one lens in the 3D cinema where as my SO could see out of both? Posted: 26 Nov 2015 05:59 PM PST So a few days ago me and my SO went to IMAX, which is a 3D cinema with "laser technology" , whilst watching the previews i noticed that i could only see out of one eye through the glasses, i asked my SO and she said she could see out of both, we swapped glasses and it was the same situation. I am aware of light polarization and how it works but my question is why only I had the issue of only being able to see through one lens and not my SO. What could have caused this? submitted by slothsandstuffyeh [link] [24 comments]

Does radiation stay close to the ground, rise, or go everywhere ? For example would it be "safe" to be inside a canyon or on top of a building ? Posted: 27 Nov 2015 04:34 AM PST I want to write a short story set in a post nuculear war world and want to keep it as accurate as possible. Also if you would be willing to share some more info (theories and such) on how the world would be after a nuculear war (what/who would survive, how would the enviroment be, where and how the last humans would settle if they survive) that would be great. submitted by The-Tewby [link] [6 comments]

Other than light, what is the fastest thing we have ever observed? Posted: 26 Nov 2015 11:19 PM PST submitted by _flume_ [link] [22 comments]

Why do people put salt on icy roads? Posted: 27 Nov 2015 04:22 AM PST submitted by Ishitalamba [link] [3 comments]

How can near-infrared light detect veins in a person's skin? Posted: 27 Nov 2015 05:29 AM PST I'm trying to figure out how this is happening. I'm just not satisfied with her explanation. http://www.cnet.com/news/near-infrared-makes-veins-easier-to-find/ submitted by Siege2Sage [link] [7 comments]

Do blind animals still turn their heads to stare at sudden noises? Posted: 26 Nov 2015 09:09 PM PST submitted by limeburst2 [link] [8 comments]

Why is it that while experiencing multiple days of intense sleep deprivation, I begin to lose my ever-persisting bout of anxiety and feel a melancholic sense of well-being? Posted: 27 Nov 2015 01:42 AM PST Just curious as to why this happens...if anyone can relate to the feeling. It's almost like a sense of self-pity takes over and gives me an ego boost... submitted by ComplacentCamera [link] [2 comments]

We can be both too cold and too hot for homeostasis, why does being cold seem to cause more sickness? Posted: 26 Nov 2015 09:20 AM PST Everyone seems to catch colds in the winter... but even in the dead summer of Arizona heat people aren't falling ill. Why? submitted by Observante [link] [12 comments]

Where do the emitted photons go when we switch frames for a charged particles falling in a gravitational field? Posted: 26 Nov 2015 11:29 PM PST There is a (solved) paradox in general relativity of what happen to a charged particle in a gravitational field. Here is the issue: a charged particle moving under the influence of gravity alone is "weightless", so it shouldn't emit any radiation. But classically we would assume that the charge is accelerating and emitting radiation, from a non-inertial rest frame (like someone standing on the earth) general relativity also agrees that the particle emits radiation. If the radiation was entirely described classically by Maxwell's equations, I could wrap my head around this difference. But I am bothered by the idea of real photons being emitted by the charge in one frame but not in another. Real particles should exist in all reference frames. And the photons are originating from the charged object, so I don't see how a co-moving observer can fail to detect them go by. In found a similar question came up in askphysics a while back, but the only suggestion there is that the radiation is emitted outside of the light cone of the co-moving observer. I don't see how that would work, given that the observer could just put a sphere of photodetectors around the charge in the co-moving frame. There are also some links to papers on the wiki page, but I couldn't access them right now (I might be able to open them at work when I get back there). submitted by AugustusFink-nottle [link] [1 comment]

Why is the speed of light 299 792 458 m/s in a vacuum? Why not faster or slower? Posted: 26 Nov 2015 08:29 AM PST submitted by Phreddi [link] [14 comments]

If a person is born without all senses would they have any experience? Posted: 26 Nov 2015 12:50 PM PST If the mind is related to the body because it is how it acquires any information about the world, is it possible for someone who is born without any sense lack the ability to gain experiences/memories. As if he/she is just a husk of a person, or incredibly comatose. But in this case, he hasn't seen the world therefore having no memories of it, which could be similar to living in a world of total blankness and having no consciousness that he/she is alive. submitted by supermamajama [link] [3 comments]

Why do thylakoids form stacks within the chloroplast? Posted: 26 Nov 2015 03:40 PM PST submitted by superhelical [link] [2 comments]

Why does visible light not cause eye damage? Posted: 26 Nov 2015 08:41 AM PST Since visible light is higher on the EM scale and has more energy than Infrared, then why does visible light not damage our eyes while infrared does (at long exposures) submitted by rostik002 [link] [6 comments]

Doesn't the no-communication theorem directly conflit this article from stanford? Posted: 26 Nov 2015 06:08 PM PST http://news.stanford.edu/news/2015/november/cryptography-quantum-tangle-112415.html No communication theorem wikipedia article: https://en.wikipedia.org/wiki/No-communication_theorem submitted by fireflambe [link] [2 comments]

Why do we lose consciousness when exposed to high levels of radiation? Posted: 26 Nov 2015 08:24 AM PST For the most part, I feel I have a cursory understanding of why the other systems and organs fail in such a circumstance. But most of the info and stories I've looked up also mention the victims fainting or losing consciousness minutes or hours later, but never explaining why. submitted by AGreenSmudge [link] [7 comments]

What physical differences allow one CPU to be faster than other at the same clock speed? Posted: 26 Nov 2015 09:08 AM PST submitted by hcrocker [link] [10 comments]

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Do terrestrial fusion reactions produce neutrinos?

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• Do terrestrial fusion reactions produce neutrinos?
• Would we ever run out of hydrogen to power fusion reactors?
• What are giant mushrooms like?
• How true is the statement, "Beer before liquor never been sicker, liquor before beer you're in the clear"?
• Why is using nitrous oxide while giving birth in a hospital a new thing?
• What does not emit electromagnetic radiation?
• Why do wine and whisky makers use oak?
• Is there a reason we can't just build an incredibly long tube to get liquids such as water or fuel into space?
• What differs different textures on molecualr/atomic level?
• How did the "different parts of the tongue sense different tastes" myth start? Did any actual scientists believe this?
• Why do some beer bellies feel firm if they're caused by extra fat? Why aren't they soft and squishy like fatty tissue in other areas of the body?
• Does the 5 mn Km difference between earth's aphelion and perihelion around the sun mean that the summers are more intense in the Southern Hemisphere?
• Can you become addicted to a drug if you are unaware you're taking it?
• Do my pets recognize me as the same person in every encounter with me?
• How much of an influence would the tides have had on the formation of life on Earth?
• Will rotation of a smooth object change the trajectory when dropped?
• Why have most modern cars adapted an even number of cylinders?
• Do the heavier elements that make up the Earth come from one specific supernova?
• If you visited a random star, how could you quickly determine if there are planets orbiting it?
• How are we able to tell the difference between a light source and an object reflecting light?
• Why does there appear to be certain spots on the moon that reflect light much more drastically than the rest?
• Does the universe have a net charge?
• Do photons have infinite momentum?

Do terrestrial fusion reactions produce neutrinos? Posted: 26 Nov 2015 01:36 AM PST We all know that the Sun produces neutrinos. That's from proto-proton fusion: p+ + p+ → 2 H + e+ + ve Do "terrestrial" fusion reactions such as D-T, or D-D also generate neutrinos? I ask, because none of the reactions listed here show any neutrino products. If the neutrinos have simply been missed out on that Wikipedia page, can Reddit suggest where I could find more complete versions. submitted by mr-strange [link] [4 comments]

Would we ever run out of hydrogen to power fusion reactors? Posted: 25 Nov 2015 07:39 AM PST Would hydrogen be considered a non-renewable resource like coal, fossil fuels, etc. if we ever got reliable fusion reactors up and running? submitted by Mr_Yeti1295 [link] [634 comments]

What are giant mushrooms like? Posted: 25 Nov 2015 10:59 PM PST So I read an article stating that the Earth used to be covered in mushrooms as tall as 24 feet. I am talking about above-ground portions of mushrooms here, not like that one underground fungus that covers a whole forest. I've also seen photos of mushrooms that are a few feet tall, maybe even up to 6 feet. So my question is, what are they like? Are they woodier than normal mushrooms to support the extra weight or are they still soft and spongy? Are any internal features larger than in normal mushrooms or are there just more of them? What would be the quantity of spores released and are they bigger as well or still microscopic? submitted by TheDaedus [link] [15 comments]

How true is the statement, "Beer before liquor never been sicker, liquor before beer you're in the clear"? Posted: 26 Nov 2015 12:21 AM PST i agree to it being anecdotal, but im wondering if there is an advantage to one physiologically.. submitted by blakerho [link] [46 comments]

Why is using nitrous oxide while giving birth in a hospital a new thing? Posted: 25 Nov 2015 08:53 PM PST In this article they talk about how one hospital in Portland, OR is now offering expecting mothers nitrous oxide as an alternative to an epidural during delivery. Why is this a new practice? It's not like nitrous is a new concept for relaxing and relieving pain during a medical procedure. Thanks in advance for any answers! submitted by dancercjt [link] [42 comments]

What does not emit electromagnetic radiation? Posted: 26 Nov 2015 03:31 AM PST My remote sensing textbook states "With the exception of objects at absolute zero, all objects emit electromagnetic radiation." I understand that an object doesn't have to emit it's own radiation, it can reflect another objects radiation. So what are the processes that cause electromagnetic radiation to be emitted? Wha are objects that do not emit their own radiation? submitted by Kolle12 [link] [4 comments]

Why do wine and whisky makers use oak? Posted: 26 Nov 2015 05:16 AM PST I understand that there are properties(chemical or porous or whatnot) in oak that are preferable for the flavor of the product, but what are they exactly? And does any other wood have similar properties or do all other wood have some thing about them that prohibits their use? submitted by Mushufu [link] [3 comments]

Is there a reason we can't just build an incredibly long tube to get liquids such as water or fuel into space? Posted: 25 Nov 2015 08:34 PM PST It seems to me like that would cut costs dramatically if you were able to build something long and strong enough. I imagine The issue is building something with both the length AND the strength to accomplish the task. Or is there another reason? submitted by Espionagelord [link] [24 comments]

What differs different textures on molecualr/atomic level? Posted: 26 Nov 2015 05:31 AM PST For example Leather, Wool or Human Skin submitted by Waffenbeer [link] [comment]

How did the "different parts of the tongue sense different tastes" myth start? Did any actual scientists believe this? Posted: 25 Nov 2015 06:28 PM PST submitted by Izzhov [link] [2 comments]

Why do some beer bellies feel firm if they're caused by extra fat? Why aren't they soft and squishy like fatty tissue in other areas of the body? Posted: 26 Nov 2015 12:01 AM PST Okay, so odd question, I know. But sometimes when a man gets a beer belly, it can feel kind of firm, like the belly of a pregnant woman. I searched a little online for why, but all I could find were "causes of beer bellies" which, is obviously extra calories leading to extra fat. What I want to know is why the beer bellies are firm instead of feeling soft and squishy like other fat. So why is that? submitted by SomeBroadYouDontKnow [link] [2 comments]

Does the 5 mn Km difference between earth's aphelion and perihelion around the sun mean that the summers are more intense in the Southern Hemisphere? Posted: 25 Nov 2015 11:38 PM PST submitted by FlyingFuck787 [link] [1 comment]

Can you become addicted to a drug if you are unaware you're taking it? Posted: 25 Nov 2015 12:13 PM PST For example, I'll design a case study and explain my thoughts at the end: Let's say that I give a few friends blueberry muffins that are baked with cocaine every morning for a month. Now, these friends have absolutely 0 idea that I've laced their breakfast treats with an addictive drug. There's 0K degrees worth of evidence to support the fact that I've been doing this, even if they had the volition to search for why my muffins are so good. Now, after a month of feeding them cocaine laced muffins, I stop feeding them muffins altogether. My assumption is that although, cognitively, they aren't aware they are receiving the drug, the cocaine is still stimulating their systems and affecting their physiology. Here's where my question kicks in. If they've become addicted to this drug without their own cognitive knowledge of taking a drug, would they crave stimulants or blueberry muffins? EG: Since an addiction is a physiological response to substances being broken down at their chemical levels, Physiologically, eating a blueberry muffin would not cure withdrawl symptoms. However, since they had no knowledge of consuming an addictive drug, would their perception override the physiological effects? In essence, I'm asking if by using the placebo effect, you could get someone addicted to a non-addictive substance? Or would they begin to crave other stimulants like caffiene, etc. submitted by Slotthy [link] [10 comments]

Do my pets recognize me as the same person in every encounter with me? Posted: 25 Nov 2015 10:51 AM PST Or do they recognize me as being different depending on different types of behavior such as when feeding them or petting them? For example, we have a very neurotic cat who hides and when I try to get her and pick her up she hisses as me. I can bring her to one of her safe spots where she feels comfortable when I pet her and she will start purring. So, does she recognize me as different people in these instances or the same person? Or is it not that simple: for example, they perceive me as part of the environment as a whole and occasionally recognize patterns and react accordingly? This goes for any pets: dogs, cats, etc. Is the answer different depending on the species? I imagine a goldfish, for example, is not that sophisticated. submitted by qwertonomics [link] [8 comments]

How much of an influence would the tides have had on the formation of life on Earth? Posted: 25 Nov 2015 07:53 PM PST I read a Scientific American Article that speculated the extreme tide cycles caused by Earth's disprortionately large moon would have had a major role in allowing DNA and RNA replication to occur in shallow tide pools. Essentially, would the Earth having such an uncommonly large satellite, relatively speaking, lend further credence to life being that much more rare in the universe? submitted by Quote_the_Ravenclaw [link] [2 comments]

Will rotation of a smooth object change the trajectory when dropped? Posted: 26 Nov 2015 05:30 AM PST Ok, so a coworker and I were having a discussion about the divots on golf balls, the bumps on basketballs, the fuzz on tennis balls, etc. based on a college experiment he did with aerodynamics. However, we came to a disagreement in the following Assumptions: * object is a perfectly balanced sphere. * surface is as smooth as modern processes can produce. * axis of spin is perpendicular to the direction of travel. * object is dropped from a machine (doesn't introduce other forces from an imperfect release) * there is no wind (no vacuum, but no wind to alter trajectory) I think that's it. Our hypotheses are that the rotation will and will not alter the trajectory (assuming, say 200 or so RPM) between us. Can someone help us understand which is correct and why? Thanks! submitted by DownwardSpirals [link] [2 comments]

Why have most modern cars adapted an even number of cylinders? Posted: 26 Nov 2015 04:53 AM PST In-line 4, Boxer 4, straight 6, V6, V8, V10, V12, W12, W16.... Why have most engineers decided that an even number of cylinders in the engine is the way to go? Of course there are few exceptions (i.e. Duratec-ST) submitted by dangp777 [link] [2 comments]

Do the heavier elements that make up the Earth come from one specific supernova? Posted: 25 Nov 2015 06:12 AM PST If they are the product of several supernovas, can we trace back the general area they came from? submitted by NickCajun [link] [11 comments]

If you visited a random star, how could you quickly determine if there are planets orbiting it? Posted: 25 Nov 2015 11:54 PM PST Let's say you're a space tourist, zipping around the galaxy looking for interesting solar systems to visit. As you approach a star, what techniques could you use to ascertain whether there are planets orbiting it? As a space tourist with a short attention span, you're only going to spend a few hours studying the solar system before moving on to the next one. Since planets are small and dark compared to stars, with lots of space between them, would you even notice any of the planets? Put another way: how realistic is the Star Trek scenario in which moments after laying a course for a star system the Science Officer can report on the number of planets the star has and whether any of them are Earth-like? submitted by bluelite [link] [1 comment]

How are we able to tell the difference between a light source and an object reflecting light? Posted: 25 Nov 2015 06:22 PM PST In my experience, light sources always look like light sources and lit up objects look like lit up objects, regardless of how bright their luminance. Why is this so? Am I incorrect in my assumption that we can always tell the difference between lights sources and illuminated objects? If so, in what situation could a light source be mistaken as an illuminated object not creating any light of its own? submitted by chahahc [link] [4 comments]

Why does there appear to be certain spots on the moon that reflect light much more drastically than the rest? Posted: 25 Nov 2015 11:17 PM PST I have recently been using my dads telescope to stargaze. Naturally, my instinct is to start with the moon since it is easier to find than most stars for the novice. I have noticed a couple spots that seem starkly more bright than the rest. I am looking at a full moon outside right now as I post this. It is November 26, 2015 at 1:07 am if that makes a difference. This may be the wrong sub but I didn't know where else to go and the things I have been reading made me feel inadequate and unsure that if they were even talking about the same simple thing I am experiencing. Ugh, sorry for all that text. Hopefully thanks in advance! Would post pix but I cant. submitted by kevinisaperson [link] [2 comments]

Does the universe have a net charge? Posted: 25 Nov 2015 08:34 PM PST Do we know if the universe has a net electric charge? What about other quantities that are normally conserved in our observations - color charge, spin, etc.? submitted by Xelif [link] [1 comment]

Do photons have infinite momentum? Posted: 25 Nov 2015 03:10 PM PST Let's assume you have a box that was lined on the inside with perfect mirrors and is a perfect vacuum. If you could somehow get light inside of this box, would it bounce around forever? Consider a light sail. As I understand it, it works because each photon imparts some of it's momentum on the sail when it bounces off of it. However, the light continues to travel at the same velocity after it is reflected, which would seen to violate conservation of momentum. As light bounces around inside this mirror box, shouldn't it impart some momentum onto the box, slowly losing momentum over time? Since it continues to travel at the speed of light, where does this extra momentum come from? submitted by ajfunk [link] [8 comments]

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We know we'll see a supernova in 2016 because we've already seen it happen due to gravitational lensing. How is this possible?

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• We know we'll see a supernova in 2016 because we've already seen it happen due to gravitational lensing. How is this possible?
• AskScience AMA Series: We are Brian Schmidt and Paul Francis, Cosmology researchers and professors at Australian National University. AUA!
• How close can two things get without touching?
• How does a fish's stomach/digestion work?
• Smiling helps produce hormones such as serotonin and dopamine, but does aggressive and masculine behaviour increase testosterone production?
• Ask Anything Wednesday - Engineering, Mathematics, Computer Science
• Are there any equations we can use to demonstrate or visualise general relativity?
• Why can almost any function be easily differentiated while so many functions cannot be integrated or are much more difficult to do so?
• Why does blood rush to our head when we're hanging upside down, but doesn't rush to our feet when we're standing right-side up?
• If the universe moves towards entropy then how did planets and life get created?
• Are there Coriolis-like effects due to the Earth revolving around the Sun?
• Why do heroin addicts feel pain when they no longer take heroin?
• Why do can't people with 20/20 vision refocus their eyes when wearing glasses?
• Are mental illnesses caused by brain chemical/activity imbalances or vice versa?
• [Physics] When boiling water on stove, why does water make a noise that gradually increase until right before boiling point?
• Was Dark Energy present at the Big Bang?
• Is there a term for when your brain perceives motion of objects surrounding you as your own motion?
• Why does adding a little salt to a bitter drink make it more tolerable?
• What's the smallest an exotic star/pulsar could be?
• Where does the proton's mass come from?
• Theory of Relativity States Time is Physical?

We know we'll see a supernova in 2016 because we've already seen it happen due to gravitational lensing. How is this possible? Posted: 24 Nov 2015 07:50 AM PST submitted by babuguuscooties [link] [498 comments]

AskScience AMA Series: We are Brian Schmidt and Paul Francis, Cosmology researchers and professors at Australian National University. AUA! Posted: 24 Nov 2015 08:57 AM PST Hello, AskScience! We're delighted to be here. We're professors at the Australian National University, currently co-teaching an online course on Cosmology. About Paul: I divide my time between astrophysics research and teaching. My research interests include comets, giant space blobs and hidden quasars. My teaching style (and taste in waistcoats) has been called unorthodox, and I've won awards for both teaching and science communication (no awards for the waistcoats, however). I am currently trying to work out why the tails of distant comets don't point the direction they should. About Brian: I am a Laureate Fellow and Distinguished Professor at ANU, and led the team that discovered dark energy – work which won the 2011 Nobel Prize for Physics. I am continuing my work using exploding stars to study the Universe, and am leading ANU's effort to build the SkyMapper telescope, a new facility that will provide a comprehensive digital map of the southern sky from ultraviolet through near infrared wavelengths. I, too, have never won an award for a waistcoat. Check out our free Cosmology course on edX, and Ask Us Anything! (We'll be back at 4 pm ET (1 pm PT, 9 pm UTC) to answer your questions!) (Edit: formatting/a link) Edit: Hi Guys - Got to finish up now - Tweet me more questions to @cosmicpinot! Hope to see you in class. submitted by Schmidt_and_Francis [link] [175 comments]

How close can two things get without touching? Posted: 25 Nov 2015 04:54 AM PST Is there a measurement for this or anything submitted by SLWeatherson [link] [5 comments]

How does a fish's stomach/digestion work? Posted: 24 Nov 2015 05:23 AM PST Predatory fishes swallowing whole another fish is a typical picture seen in documentaries. But, how does a fish's digestion work when compared against land animals? Are their preys whole and alive in their stomach until they suffocate from the lack of water/oxygen flow? And what about the gastric acids? How does living in an underwater environment affect the digestive juices composition/concentration? submitted by dkysh [link] [18 comments]

Smiling helps produce hormones such as serotonin and dopamine, but does aggressive and masculine behaviour increase testosterone production? Posted: 24 Nov 2015 09:34 AM PST submitted by mrownsalot [link] [11 comments]

Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 25 Nov 2015 07:02 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer Science 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 AutoModerator [link] [2 comments]

Are there any equations we can use to demonstrate or visualise general relativity? Posted: 24 Nov 2015 08:45 PM PST We often see diagrams showing the Earth or sun in a kind of grid that is bent that shows light following a geodesic ( rubber sheet model or so-called embedding diagram . I've asked in /r/askphysics but they claim there are no simple equations that demonstrate this principle and they also suggest that these kinds of diagrams are poor or misleading. How can we visualise these effects? even for just a slice of space-time for example. Why can't we plot for example the curvature of space-time caused by the sun in 2 dimensions? The closest I have found is at http://www.spacetimetravel.org/isl/isl.html but what equations are they using for example to show this? submitted by auviewer [link] [9 comments]

Why can almost any function be easily differentiated while so many functions cannot be integrated or are much more difficult to do so? Posted: 24 Nov 2015 04:28 AM PST submitted by snkn179 [link] [28 comments]

Why does blood rush to our head when we're hanging upside down, but doesn't rush to our feet when we're standing right-side up? Posted: 24 Nov 2015 06:08 PM PST submitted by Jimbobsupertramp [link] [5 comments]

If the universe moves towards entropy then how did planets and life get created? Posted: 24 Nov 2015 07:59 PM PST I was discussing god and atheism and all that with my theist cousin. He said that the universe moves towards entropy, towards disorder then how did something as complex as a human being get created? It must be a sign pointing towards god. So what do I say to him in return? submitted by FuckKarmaAndFuckYou [link] [9 comments]

Are there Coriolis-like effects due to the Earth revolving around the Sun? Posted: 24 Nov 2015 07:16 PM PST The Coriolis effect results in deflections of inertial systems on the surface of the Earth and also influences vertical motion. Are there any similar measurable effects due to orbiting the Sun at ~18 miles per second? submitted by sharkmeister [link] [6 comments]

Why do heroin addicts feel pain when they no longer take heroin? Posted: 24 Nov 2015 06:18 AM PST I know how the nervous system works and that when people take heroin it blocks the receptors. This then leads to the body growing more receptors. Then it repeats until there are millions of receptors. Ultimately my question is: What triggers the receptors to feel pain when people are recovering from heroin addiction? submitted by Craren [link] [42 comments]

Why do can't people with 20/20 vision refocus their eyes when wearing glasses? Posted: 25 Nov 2015 06:34 AM PST Why can't the lens/cornea adjust to refocus the image onto the retina? submitted by thuzzz [link] [2 comments]

Are mental illnesses caused by brain chemical/activity imbalances or vice versa? Posted: 24 Nov 2015 02:38 PM PST I don't technically mean to limit this to only illnesses, but perhaps it'll make the question easier to answer. The mechanism for action for many drugs for anxiety, depression, etc. seem to be based upon fixing a chemical imbalance and brain activity imbalances in the brain. However, it seems some non-drug based methods for mental illnesses (eg. CBT, four steps method for OCD from Dr. Schwartz, and meditation) also produce observable changes in brain activity (and presumably chemical composition) in patients. Is there a general consensus and a lot of strong evidence for which is the cause and effect in the brain for illnesses? submitted by reqursion [link] [4 comments]

[Physics] When boiling water on stove, why does water make a noise that gradually increase until right before boiling point? Posted: 24 Nov 2015 02:03 PM PST I recently realized that water makes this "pkhhh" noise getting lauder until it boils. And when it starts to boil it stops. But why? submitted by hbostann [link] [5 comments]

Was Dark Energy present at the Big Bang? Posted: 24 Nov 2015 07:17 PM PST What I mean is, when did Dark Energy begin to start pushing matter and dark matter apart? submitted by warnakey [link] [1 comment]

Is there a term for when your brain perceives motion of objects surrounding you as your own motion? Posted: 24 Nov 2015 09:31 AM PST For example, when you are sitting in a car, see somebody pulling forward, and perceive it as your car going in reverse? submitted by Tokusatsu_fan [link] [4 comments]

Why does adding a little salt to a bitter drink make it more tolerable? Posted: 24 Nov 2015 11:52 AM PST Even a very small pinch of table salt makes coffee and green tea much more easily tolerated. Is this an effect on the tastebuds or is it something happening on a chemical level? I can find a lot of resources online mentioning the effects but none of them address what's happening at a molecular level. submitted by errant_errephant [link] [4 comments]

What's the smallest an exotic star/pulsar could be? Posted: 24 Nov 2015 05:35 PM PST There's plenty out there for black holes being a very wide variety of sizes, from the sub-nano to approaching the parsec. The range is narrower for Neutron stars, between ~50ish and ~20ish kilometers for their modest mass range (anywhere from 0.1 solar masses to ~2ish?). What I'd like to know is: what sort of sizes can other exotic formations be? (Quark stars, strange stars, etc.) Secondly, what's the smallest a black hole can be before it immediately evaporates due to hawking radiation? submitted by accidentallybrill [link] [3 comments]

Where does the proton's mass come from? Posted: 24 Nov 2015 03:56 PM PST I know the proton's mass does not come from the individual quark's rest mass. Where does the rest of the mass come from? I found two different answers in two different sources: The high kinetic energy via relativistic effects. The vacuum energy. Which is the right answer? Do they both refer to the same thing? submitted by rational_romanian [link] [17 comments]

Theory of Relativity States Time is Physical? Posted: 24 Nov 2015 07:39 PM PST The theory of relativity tells us that time can bend around physical objects. How is this possible if time is merely a concept or unit of measure developed by people? A second should still be a second regardless of distance or speed traveled? Just as that distance would be measurable to the foot, meter, km, au, ect. Distances do not change as they are also a predetermined length. So how is it that a concept developed by the human race is suddenly changed purely based on speed? submitted by sound-of-impact [link] [2 comments]

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