Moving water is one of the quickest ways to cool something down, but also to defrost it- why?

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• Moving water is one of the quickest ways to cool something down, but also to defrost it- why?
• Is the digestive process always first-in, first-out, or can quickly digestible meals "pass" slower digesting meals in the intestines?
• Why are moles often the site of skin cancer? Doesn't more melanin mean more protection from the sun?
• How significant is effect of friction losses in fluid transmission lines?
• How sure are that the K-T extinction event was caused by the Chicxulub asteroid?
• What are the effects of lithium levels (on the range of 0-50 mg/L) in drinking water?
• What causes gasses to be different colors?
• I have studied that that blood vessels, like any tissue, need nutrients and hence there are tiny blood vessels on their walls known as "vasa vasorum". The question here is, how these tiny structures get their own supply?
• What’s the consensus on using combination antibiotics in order to reduce the effect of bacterial resistance?
• Transplants, what's done before they happen?
• Is it possible to have an anaphylactic reaction upon your first exposure to the allergen?
• Are sound waves affected by gravity?
• Can scientist predict volcanic activity and why hasn't anything like Pompeii happened recently and how long after an eruption does a place recover?
• Is a shockwave different from a sound?
• How much "lag" is there in the human brain?
• Can birds get fat?
• How do we know, or do we know, that the parts of an atom are round?
• How does tidal heating work?
• Why don't strong magnetic fields disrupt the normal electrical activity of cells?
• How do radio stations know how many receivers are listening to them?
• Why is both helium 3 and deuterium required for a fusion reaction?

Moving water is one of the quickest ways to cool something down, but also to defrost it- why? Posted: 11 May 2018 04:58 AM PDT I remember learning a while ago that many rural and poor communities throughout the world use running water as refrigeration for food and that it's an incredibly fast way of cooling something. I recently discovered that running water is also practically the quickest way we have of defrosting things. I understand that water is a great insulator and heat conductor but that doesn't explain the counter-intuity here. Is there something else going on? submitted by /u/Dux0r [link] [comments]

Is the digestive process always first-in, first-out, or can quickly digestible meals "pass" slower digesting meals in the intestines? Posted: 10 May 2018 03:33 PM PDT Google searches only seem to bring up information on constipation. submitted by /u/mrfiveby3 [link] [comments]

Why are moles often the site of skin cancer? Doesn't more melanin mean more protection from the sun? Posted: 10 May 2018 06:47 PM PDT submitted by /u/AtomicFreeze [link] [comments]

How significant is effect of friction losses in fluid transmission lines? Posted: 11 May 2018 01:00 AM PDT In comparison to other losses in the system, e.g. consider a simple circuit of a pump and motor connected How would this change with line length? submitted by /u/mawst [link] [comments]

How sure are that the K-T extinction event was caused by the Chicxulub asteroid? Posted: 11 May 2018 06:50 AM PDT submitted by /u/dredawg1 [link] [comments]

What are the effects of lithium levels (on the range of 0-50 mg/L) in drinking water? Posted: 10 May 2018 05:58 PM PDT I was reading about lithium in well water and came across a few interesting articles: https://www.newscientist.com/article/2145074-lithium-in-tap-water-seems-to-both-raise-and-lower-dementia-risk/ Says low levels can raise or lower dementia risk, depending on dose https://www.tandfonline.com/doi/abs/10.1080/07315724.2002.10719188 Says low water lithium levels are correlated with some negative behaviors http://www.jpands.org/vol20no4/marshall.pdf Looks super sketchy, and pretty much says lithium is the best thing ever. Since I can't bring myself to trust that last one, I was hoping r/askscience might be able to give some input. submitted by /u/Hatsuwr [link] [comments]

What causes gasses to be different colors? Posted: 11 May 2018 07:22 AM PDT Like how oxygen and water vapor are colorless or how nitrogen is white right after it boils and then colorless once it settles. submitted by /u/riphitter [link] [comments]

I have studied that that blood vessels, like any tissue, need nutrients and hence there are tiny blood vessels on their walls known as "vasa vasorum". The question here is, how these tiny structures get their own supply? Posted: 11 May 2018 07:20 AM PDT submitted by /u/Mr_Nobel96 [link] [comments]

What’s the consensus on using combination antibiotics in order to reduce the effect of bacterial resistance? Posted: 11 May 2018 07:17 AM PDT I've read little bits from several different places on ways in which we can combat bacterial resistance. One study mentioned the use of several different antibiotics all targeting different essential pathways of a bacteria in order to reduce the chances that a certain amount of the population will survive and proliferate. It was something along the lines of: say the chance bacteria A has a mutation M1 which allows it to survive antibiotic 1 is 1/1000 and the chance it has mutation M2 to survive antibiotic 2 is also 1/1000. Then if we use both antibiotics 1 and 2 together the odds of any one bacteria having the exact two mutations necessary for survival decreases drastically as the probability becomes (1/1000)2. What if we use 3 antibiotics? Or 10? Are we already doing this? If so is it general practice? If we aren't why not? I read something which mentioned the interactions between antibiotics being a difficult factor to control for but surely we could work this out and we would work this out in order to fight something so threatening such as bacterial resistance? Thanks in advance :) submitted by /u/Fellainis_Elbows [link] [comments]

Transplants, what's done before they happen? Posted: 11 May 2018 06:54 AM PDT Like compatibility with donor and receiver. Why do some fail after some years? Are blood test done before such as mixing of the blood? submitted by /u/ocj213 [link] [comments]

Is it possible to have an anaphylactic reaction upon your first exposure to the allergen? Posted: 11 May 2018 05:49 AM PDT Second year medical student here - as I'm currently preparing for my immunology exam, I was reading up on anaphylactic response. As far as my textbook says, the 1st type of hypersensitivity reaction is the cause for anaphylaxis, but it says that such a reaction (anaphylaxis) can only occur in a later exposure - so I presume you can only get an allergic anaphylactic reaction upon your second exposure to the allergen. However, I was wondering - since common anaphylaxis triggers are venom from insect bites or stings, I was wondering, in a hypothetical situation - if I was bitten by a poisonous snake (e.g. by a common adder) - is it possible to get an anaphylactic response immediately or would I have to be bitten twice by the same species? Thank you! submitted by /u/TrustTheUniverse [link] [comments]

Are sound waves affected by gravity? Posted: 11 May 2018 04:47 AM PDT I was just reading a different post about volcanoes and someone had brought up a (I'm dumbing this down because phone) super loud eruption that was heard clearly 3000 miles away from its source. Following that statement was a fun fact of the sound waves circling earth four times. Is this possible? Wouldn't it go in a straight line either way and not stop until leaving the atmosphere? submitted by /u/MisterDomino15 [link] [comments]

Can scientist predict volcanic activity and why hasn't anything like Pompeii happened recently and how long after an eruption does a place recover? Posted: 10 May 2018 10:49 AM PDT So, after watching the news about the volcanic activity in Hawaii, I had a few different questions that are all related. 1.) Can scientists predict a volcano eruption, and if so how soon can they do it and how? 2.) Why has there not been any crazy volcanic activity like what you read about with Pompeii, etc.? 3.) How long does it take an area to recover/become habitable after a volcanic eruption? submitted by /u/theresalwaysthatone [link] [comments]

Is a shockwave different from a sound? Posted: 10 May 2018 08:33 PM PDT So I was holding a loaf of bread once as someone slammed the microwave door fairly hard on the other side of the kitchen. The sound wasn't too loud, but I could also sense something in the bread as the door slammed, like it was vibrating at that moment. So I assume that was the shockwave, somehow. I guess my question is, why can I only seem to feel this sensation when I'm holding literally nothing but a loaf of bread, when I can hear the sound just fine? If it's of any importance, the loaf is fairly 'sealed' from the outer layer, so it acts sort of like a balloon. submitted by /u/Reed1981 [link] [comments]

How much "lag" is there in the human brain? Posted: 10 May 2018 03:50 PM PDT It seems no matter where you go the brain is always compared to a computer. Since your neurons don't transmit at the speed of light in a vacuum there has to be some form of lag. I first thought well maybe it's reaction time but I'm more wondering about the time it takes for the senses to transmit and the brain to receive that information submitted by /u/TheRealSchackAttack [link] [comments]

Can birds get fat? Posted: 10 May 2018 02:36 PM PDT submitted by /u/octorabbit74 [link] [comments]

How do we know, or do we know, that the parts of an atom are round? Posted: 10 May 2018 09:52 PM PDT Every representation of parts of an atom, the protons, neutrons, and electrons, they're always presented as being round. Is this something we know or something that is at least likely, or is this just some rudimentary way of representing the parts, and if they are at least likely or we know they're round how do we come to this conclusion? submitted by /u/mysticclay [link] [comments]

How does tidal heating work? Posted: 10 May 2018 05:28 PM PDT I was watching a video and someone said that some Jupiter's moons aren't as cold due to a process called tidal heating but didn't add much to it. Can someone explain because it sounds cool? submitted by /u/kbX1 [link] [comments]

Why don't strong magnetic fields disrupt the normal electrical activity of cells? Posted: 10 May 2018 05:03 PM PDT If cells rely on charged particles for function, such as the electrochemical gradient of a nerve cell, it seems like a strong magnetic field should change the alignment/direction/movement of the molecules. submitted by /u/emergency_seal [link] [comments]

How do radio stations know how many receivers are listening to them? Posted: 10 May 2018 08:47 AM PDT submitted by /u/kiekrzanin [link] [comments]

Why is both helium 3 and deuterium required for a fusion reaction? Posted: 10 May 2018 11:33 AM PDT I was watching a video (https://youtu.be/mZsaaturR6E) (yep I'm not too versed) and they said that both deuterium and tritium or helium 3 was required for the fusion reaction. Why can deuterium not fuse with itself? If the plasma was hot/dense enough would this be possible? submitted by /u/MalgrugrousStudent [link] [comments]

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Is the human body affected by the changing seasons?

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• Is the human body affected by the changing seasons?
• What is the cost input/output of current nuclear fusion designs?
• Is there a certain priority list for a severely damaged human body to heal itself?
• If I lift an object up by 1m will its mass increase by a factor of ~g/c^2 from the extra potential energy? If so, is this effect experimentally observable or is gravity too weak?
• What makes two antidepressants in the same class different from one another?
• What are the differences between the mechanisms of bipolar depression and of unipolar depression?
• How have astronomers been able to make reliable estimations about the rotational velocity of galaxies given that an estimated full rotation takes over a billion years and radio telescopes observing them have been around for less then 100 years?
• Do herds of Caribou have a leader?
• What happens when a storm crosses the Grand Canyon?
• Are there any theories of a correlation between massive volcanic eruptions and a reversal of earth's magnetic field?
• What makes nuclear bombs so difficult to build?
• How do cells choreograph their growth to form the proper shape of the bone or organ?
• How do substrates actually get into their active sites in enzymes?
• Do we currently have any precautions installed in case an asteroid starts heading towards Earth? If so, what are they?
• Is there anything that can catalyze nuclear reactions?
• Why do vegetables such as asparagus/beets change the color of our pee, but artificial colors don't?
• Why is the relativistic adiabatic index 4/3?
• When supposing a product solution to solve a linear PDE, how do we rule out existence of solutions that cannot be expressed as a sum of product solutions?
• Where exactly does the energy in a nuclear reaction (fission and fusion) come from, since the number of particles remains unchanged?
• Is there one big, planetwide weather system, or does each country calculate their own? If so, what sort of communication exists between them?
• How does ethanol affect animal cells?

Is the human body affected by the changing seasons? Posted: 10 May 2018 06:23 AM PDT If we don't grow a winter coat like dogs, we don't have a set mating season, we don't migrate, etc, are we affected in any other way? If not, at what point did we lose those traits? submitted by /u/maudiestirling [link] [comments]

What is the cost input/output of current nuclear fusion designs? Posted: 10 May 2018 03:27 AM PDT Unsure whether to flair economics or physics for this, but I was curious as to the current gap in the cost of the energy input to the energy output worth of current nuclear fusion designs. submitted by /u/Lost_Sojourner [link] [comments]

Is there a certain priority list for a severely damaged human body to heal itself? Posted: 09 May 2018 07:04 AM PDT Does human body have a priority list for healing the body? For example: if a human body has multiple fractures, severed nerves, multiple lacerated organs, internal bleeding and cuts and bruises, how does the body react to the healing process? Which of the wounds and damaged areas it starts to heal first? I am aware of different kinds of shocks and reactions to the human body, but lets cast those aside. Is it strictly related to DNA only or is there some sort of other mechanisms the body/brain uses? submitted by /u/M3nt4lcom [link] [comments]

If I lift an object up by 1m will its mass increase by a factor of ~g/c^2 from the extra potential energy? If so, is this effect experimentally observable or is gravity too weak? Posted: 10 May 2018 05:29 AM PDT submitted by /u/grumblingduke [link] [comments]

What makes two antidepressants in the same class different from one another? Posted: 09 May 2018 08:42 PM PDT I know different classes target different serotonin receptors, but what is the difference between two SSRI's, or two SNRI's? Why does one SSRI work well for someone, but a different SSRI doesn't work at all for them, even though the two drugs are in the same class? And if someone responds well to an SSRI, does that make them more likely to respond well to every SSRI? submitted by /u/heyitsme_12345 [link] [comments]

What are the differences between the mechanisms of bipolar depression and of unipolar depression? Posted: 10 May 2018 03:26 AM PDT submitted by /u/chrishuang1206 [link] [comments]

How have astronomers been able to make reliable estimations about the rotational velocity of galaxies given that an estimated full rotation takes over a billion years and radio telescopes observing them have been around for less then 100 years? Posted: 10 May 2018 03:22 AM PDT I was reading some posts on here and on the web about dark matter and why astronomers believe it exists. My understanding is that two of the reasons are connected to observations concerning the rotational speed of galaxies. Firstly, the rotational velocity observed did not match the estimated mass of stars in an observed cluster, secondly that all stars in galaxies appear to rotate at a constant velocity. This I understand. What I don't understand is how can astronomers be so sure about the observed rotational velocities - if a full galaxy rotation takes over a billion years then all that we can have been able to observe since we built radio telescopes is 10 to the power -7 of that rotation (Sorry unable to write maths in word)? Which is a tiny, tiny fraction of a degree. How can they be so sure that there is no sizable error in there - how can they even see that tiny amount of rotation? Lastly, a less clear and perhaps less interesting question, connected to the above, how do they correct for our own Milky Way's galactic rotation when making observations? Presumably they must be able to tell which galaxies are rotating along the same axis as ourselves and which are tilted away from our axis and by how much? I'm running on a layman's assumption that there might be a galaxy rotating identically to the way we rotate in which case surely there'd be no observed rotation? But when they detect a rotation are they able to state with certainty how much the observation is affected by our relative rotation or is that open to error too? submitted by /u/OriginalGreasyDave [link] [comments]

Do herds of Caribou have a leader? Posted: 09 May 2018 06:54 PM PDT submitted by /u/69waystodie [link] [comments]

What happens when a storm crosses the Grand Canyon? Posted: 09 May 2018 05:38 PM PDT Curious about the title. submitted by /u/MundialMan [link] [comments]

Are there any theories of a correlation between massive volcanic eruptions and a reversal of earth's magnetic field? Posted: 09 May 2018 09:10 PM PDT I was reading this article about increased seismic activity in the Yellowstone basin. In the article it stated that the last major eruption of the Yellowstone super volcano was about 640,000 years ago, which was about the same time as the last magnetic pole reversal. Are both Earth's magnetic field and volcanic activity controlled by Earth's core? submitted by /u/fuckingoff [link] [comments]

What makes nuclear bombs so difficult to build? Posted: 09 May 2018 08:23 PM PDT I see in the news developing countries threaten to build a nuke. What are the barriers to making them and why do developing nations struggle with it? submitted by /u/transcendtime [link] [comments]

How do cells choreograph their growth to form the proper shape of the bone or organ? Posted: 09 May 2018 05:53 PM PDT As the title asks, how do cells know what the boundaries of their growth should be (non cancerous) and choreograph proper organ and bone formation? In other words, how do cells know which direction to grow in order to form the normal shape of that tissue? In my mind, there would have to be some separate process in charge of controlling the cells that is aware of the position of each cell and can control the growth speed and direction. But I feel that is probably wrong. I understand the concept of stem cells becoming specialized cells, with full instructions about what the cell should be and how it behaves. What i don't understand is the choreography involved in shaping. submitted by /u/KorgRue [link] [comments]

How do substrates actually get into their active sites in enzymes? Posted: 09 May 2018 08:57 PM PDT It seems that the chances of the substrates finding their way into the active site would be very uncommon due to their complex shapes, is there an aid or is it just through concentration of both elements? submitted by /u/MoistAmphetamine [link] [comments]

Do we currently have any precautions installed in case an asteroid starts heading towards Earth? If so, what are they? Posted: 09 May 2018 03:11 PM PDT submitted by /u/fusrohdab [link] [comments]

Is there anything that can catalyze nuclear reactions? Posted: 09 May 2018 05:52 PM PDT submitted by /u/FrostyFrisby456 [link] [comments]

Why do vegetables such as asparagus/beets change the color of our pee, but artificial colors don't? Posted: 09 May 2018 08:03 PM PDT submitted by /u/Calicomonster [link] [comments]

Why is the relativistic adiabatic index 4/3? Posted: 09 May 2018 05:30 PM PDT I was told that in the relativistic limit the adiabatic index approaches 4/3 for a monoatomic gas instead of 5/3 in the non-relativistic case. I was told this occurs due to a reduction in degree of freedom but this may be incomplete and does not quite explain the new expression since adiabatic index = (n + 2)/n where n is the # of degrees of freedom. Thus I am wondering both quantitatively and qualitatively, why does the adiabatic index decrease, and to 4/3 specifically, in the relativistic regime for a monoatomic gas? submitted by /u/CallMeDoc24 [link] [comments]

When supposing a product solution to solve a linear PDE, how do we rule out existence of solutions that cannot be expressed as a sum of product solutions? Posted: 09 May 2018 05:28 PM PDT In part I want to know how this was justified historically, if it was at all. This is for a presentation about fourier series and I want the logic to be as airtight as possible. I'm willing to weaken the assumptions to avoid having to say "... which we know for technical reasons too advanced to get into." in Fourier's book The Analytic Theory of Heat (1822), where he first develops fourier series, he uses the product solution trick to solve the heat equation. He does not explicitly address the question of whether there could be solutions that aren't a sum of products. He does prove uniqueness of his solutions, but only in a framework that presupposes his general form encompasses all possible solutions. Was Fourier being sloppy relative to modern standards of rigor, or is there some unstated result he's relying on? I'm aware that, in the language of functional analysis, it's not difficult to show a fourier series converges to its associated function if the latter is in the right space, and that this was shown contemporaneous to Fourier. What I'm looking for is, how do we (or how did Fourier) justify the conclusion we found the full solution of the linear PDE when we solved it by assuming the solution can be expressed as a sum of products of functions of one variable. submitted by /u/yassert [link] [comments]

Where exactly does the energy in a nuclear reaction (fission and fusion) come from, since the number of particles remains unchanged? Posted: 09 May 2018 03:01 PM PDT I know it has something to do with changes in the amount of energy holding atoms together, but I feel really fuzzy on that. submitted by /u/rebblt [link] [comments]

Is there one big, planetwide weather system, or does each country calculate their own? If so, what sort of communication exists between them? Posted: 09 May 2018 08:19 AM PDT submitted by /u/walt02cl [link] [comments]

How does ethanol affect animal cells? Posted: 09 May 2018 06:38 PM PDT Does it interact with receptors or does it pass throught the lipid bilayer? If the latter, What does it interact with inside of the cell? Thanks in advance submitted by /u/Big_catC [link] [comments]

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Can plants be "fat"?

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• Can plants be "fat"?
• How dense were dinosaur populations (e.g., t-Rex, velociraptor, brontosaurus) at the height of their respective time periods?
• Do relativistic light sources decelerate?
• How does the nutrients of a banana and its peel change as it ripens? Is nutrients transferred between the peel and the banana in any way or are they separate entities? If so, what is the mechanism of transfer?
• Is there a point/limit when a cluster of mass can/will become a planet?
• How does tuned mass damper work?
• How does one’s current gene expression impact genetic heritability in one’s offspring? Is it different for mothers and fathers?
• Is there a quantitative way of measuring tiredness?
• What is the chemical reaction formula for bleach reacting with human skin?
• Why do two stroke gasoline engines have to use mixed fuel? Why aren't they designed with a separate oil system?
• Will the earths core ever cool down?
• Is showing the same ad to the customer multiple times like what happens on TV effective?
• How long does it take a rain cloud to 'rain out' itself on average?
• Ask Anything Wednesday - Engineering, Mathematics, Computer Science
• Do nuclear weapons like the ones used on Japan, move the clouds/affect the weather significantly?
• How is the dark matter in the solar system organized? Is it moving?
• Is there any long term possibility of containing (or hopefully reversing) the ecological contamination of the Great Lakes?
• How do fish get around beaver dams?
• Is a decimal made of up all numbers in sequential order an irrational number?
• Doesn't the Coastline paradox apply to everything?
• What is the difference between GPS and Satellite Communication?

Can plants be "fat"? Posted: 08 May 2018 08:33 AM PDT Edit: Oh guys, this is amazing. Thank you all submitted by /u/Medesimo [link] [comments]

How dense were dinosaur populations (e.g., t-Rex, velociraptor, brontosaurus) at the height of their respective time periods? Posted: 08 May 2018 10:39 AM PDT For example, was the T-Rex population similar to that of mountain lions or more similar to that of field mice? submitted by /u/stbillings [link] [comments]

Do relativistic light sources decelerate? Posted: 09 May 2018 05:33 AM PDT Relativistic beaming is a process by which the light emitted by an isotropic source appears biased in intensity in the forward direction. My question is: given the intensity of radiation is greater in the forward direction, will the source not be acting like a photon drive, and hence decelerate? Furthermore, won't people in different reference frames observe different decelerations? And what about the frame in which the source is stationary? submitted by /u/MaximilianCrichton [link] [comments]

How does the nutrients of a banana and its peel change as it ripens? Is nutrients transferred between the peel and the banana in any way or are they separate entities? If so, what is the mechanism of transfer? Posted: 09 May 2018 06:29 AM PDT submitted by /u/lxBATESxl [link] [comments]

Is there a point/limit when a cluster of mass can/will become a planet? Posted: 09 May 2018 02:17 AM PDT So, my idea was as follows: In the next hundreds of thousands of years (of humanity will survive that is) humans roam around the solar system/galaxy and increased amount of space debris is jettisoned to space; could this potential cluster of space debris tip over a certain point/limit until it starts the process of becoming a planet? (Of course we need to imagine that this space debris needs to be stationary somehow and all of it needs to be all in the same area, ignore that fact) I know this is really far fetched, because of the sheer enormous amount of mass needed for it. But could it be theoretically possible to walk on a human made planet? Is there a reaction/process that a cluster of mass goes through as it "evolves" into a planet? submitted by /u/M3nt4lcom [link] [comments]

How does tuned mass damper work? Posted: 09 May 2018 06:43 AM PDT I understand that the tuned mass damper oscillate in the opposite direction of the building it is installed on to reduce the the "shake" the building experiences and allow it to return to normal, but I do not understand how the values of the frequency of oscillation of the building and the damper compare, any lurking physicist help out? thanks! submitted by /u/friedbreadsticks [link] [comments]

How does one’s current gene expression impact genetic heritability in one’s offspring? Is it different for mothers and fathers? Posted: 09 May 2018 06:58 AM PDT I've been learning about gene expression and how environmental changes have an impact on proteins, etc. How does this have an impact on what genetic information is passed along to one's offspring? For example, a twin study done on astronauts Mark and Scott Kelly showed changes in gene expression, but not DNA. However, I was wondering if any children produced before and after such a space flight, would be impacted by the change in gene expression as to what their own DNA make-up might be? Would it impact other things like RNA? Since a female's eggs have already been formed in utero, does her own environmentally shifting gene expression have any impact on the DNA and/or gene expression of the eggs throughout her life, prior to fertilization? Since a male makes sperm continuously, what is the impact of gene expression for his offspring? Are there any questions I'm not asking that relate to this question of heritability for offspring in relation to environmental adaptations for parents? Thanks! submitted by /u/JustMeRC [link] [comments]

Is there a quantitative way of measuring tiredness? Posted: 09 May 2018 04:15 AM PDT I was about to go to sleep last night and was thinking "I don't have to get up as early as usual tomorrow morning, so I can put my alarm clock back a bit. I wonder; would I feel better-rested if I kept my clock at its normal alarm time, and just snoozed it, or would I feel more rested if I pushed the alarm back a bit? How would I measure tiredness? Is there such a measure?" then I went to sleep. So yeah, is there a way that doctors (neuroscientists?) measure tiredness? Is that even feasible? When diagnosing, for example, insomniacs etc. do they measure this kind of thing? If there is some quantitative measure of tiredness, what is it based on? Reaction times? Some brainwave thing? Or something else entirely? submitted by /u/cow_co [link] [comments]

What is the chemical reaction formula for bleach reacting with human skin? Posted: 09 May 2018 06:41 AM PDT Bleach's equation is : 4 NaOH + 3 Cl2 = 2 NaCl2 + 2 NaClO + 2 H2O I want to know the reaction of bleach with the human skin in the form of an equation. submitted by /u/DrMasquerade [link] [comments]

Why do two stroke gasoline engines have to use mixed fuel? Why aren't they designed with a separate oil system? Posted: 08 May 2018 06:53 PM PDT The main problem with two stroke engines is that they do not burn cleanly, thus restricting their use to small applications despite their high power to weight. I do not understand why they must have the fuel be the lubricant instead of having separate oil and fuel like 4 stroke engines. submitted by /u/bananas401k [link] [comments]

Will the earths core ever cool down? Posted: 08 May 2018 06:25 PM PDT Since the earth is constantly rotating wont that cause friction with the magma, creating more heat? So will the core ever reach a cool state? Can liquid even create heat through friction? submitted by /u/Faydid808 [link] [comments]

Is showing the same ad to the customer multiple times like what happens on TV effective? Posted: 08 May 2018 07:39 PM PDT submitted by /u/kareemwp2000 [link] [comments]

How long does it take a rain cloud to 'rain out' itself on average? Posted: 08 May 2018 03:48 PM PDT submitted by /u/KindaSithy [link] [comments]

Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 09 May 2018 08:12 AM PDT 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 /u/AutoModerator [link] [comments]

Do nuclear weapons like the ones used on Japan, move the clouds/affect the weather significantly? Posted: 08 May 2018 08:42 PM PDT I'm watching a world war II documentary and I've always been fascinated by radiation and atomic weapons. Do the blasts such as the one at Hiroshima significantly push nearby pre-blast natural clouds or affect the weather in the days after the explosion? I've always thought nukes we're THE weapon, and want to kind of understand my perceptions of their power. submitted by /u/Jackanapes95 [link] [comments]

How is the dark matter in the solar system organized? Is it moving? Posted: 08 May 2018 05:50 PM PDT A few key premises of my question: There's a bunch of dark matter in our system, sort of invisibly superimposed on top of the familiar sun, planets, asteroids, and other bodies Dark matter is influenced by the curvature of space, so it presumably prefers to gather in the gravity wells of the sun and the planets Dark matter cannot be compressed the way that baryonic matter can, so there is something like a maximum possible density of dark matter, which might mean that a comparatively small amount of dark matter could fill the space in our system So, I envision a kind of parallel solar system, albeit one whose bodies may be less interesting because they don't interact with most of the energy in the baryonic system, and because I assume they don't really generate anything analogous to geothermal energy, which might drive movement. What does this parallel solar system look like? Is it a colossal, solid sphere of matter that encompasses the entire system? Is it a disk? Or is dark matter clustered around the planets? Or is there not even enough to fill the sun's gravity well? How does it move? Is it like a big ball of sand, whose individual grains are free to move? Or is it more like a lump of rock? Thanks! submitted by /u/rogert2 [link] [comments]

Is there any long term possibility of containing (or hopefully reversing) the ecological contamination of the Great Lakes? Posted: 08 May 2018 12:55 PM PDT I've read around a bit, but I haven't found a really satisfactory answer. Is it possible for us to reverse the effects at some point, or are these invasive species here to stay? I know that one of the solutions is to prevent the dumping of ballast tanks in the Lakes. Are there others that might be more effective at ridding the Lakes of these species (instead of just halting the influx)? For those of you who don't know, the Great Lakes were pretty much physically isolated from the rest of the aquatic world for a really long time. Once we opened the St. Lawrence Seaway (and built a bunch of locks) we managed to bring in invasive species from elsewhere that the Lakes weren't ecologically ready for (apparently ship-borne in ballast tanks, which were dumped when they arrived in the Lakes). Zebra mussels are a good example of one such species. submitted by /u/Pr3ssAltF4 [link] [comments]

How do fish get around beaver dams? Posted: 08 May 2018 03:45 PM PDT Obviously, fish getting blocked by man made dams is a major engineering problems, so why is that not so much of a problem for beaver dams? If it isn't, why can't we just apply the beaver solution to our man made dams? submitted by /u/LiterallyBismarck [link] [comments]

Is a decimal made of up all numbers in sequential order an irrational number? Posted: 08 May 2018 07:23 PM PDT IE: 0.123456789101112131415161718192021... And if it does, does this number have any special meaning, or just one of many irrational numbers? I want to lean towards yes, because if it technically contains all numbers, does that mean at point down the line the number contains all the digits of Pi too? Bonus question: Does Pi theoretically at some point down the line have a point where it repeats all of the digits of Pi? I tried googling it and didn't come up with much. submitted by /u/Ariacilon [link] [comments]

Doesn't the Coastline paradox apply to everything? Posted: 08 May 2018 03:21 PM PDT You can zoom into anything, measure it and the small details would make its surface area basically "infinitely" big, no? submitted by /u/nexusnuva [link] [comments]

What is the difference between GPS and Satellite Communication? Posted: 09 May 2018 03:27 AM PDT I can't seem to find anything that discusses the difference between these two systems (or if they are even two systems), so I'm applying to you, reddit hive mind, for an answer. Specifically, what interests me is why one can't send a message over the GPS network in the same way one could over the Iridium network, and why a GPS location can't be followed if it isn't shared via a mobile network. Isn't the satellite receiving my GPS location? Why can't I opt in to that information being shared? If that were the case, I could walk around and spell out "HELP" with my track, and fellow mountaineers could see it in real time. Background, I'm a mountain guide and often head out to remote places with no mobile network coverage. I'm contemplating buying a small satellite messaging device to stay in touch (like the Garmin InReach), and I'm wondering why a phone's GPS can't do the same thing. And if it isn't possible yet, why not and could it ever be? submitted by /u/Danniel33 [link] [comments]

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