Are human the only animals that can use ketone bodies to fuel the brain?

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• Are human the only animals that can use ketone bodies to fuel the brain?
• Is there a maximum length that a human hair can grow to?
• A recent Imperial College London study predicts that on average, by 2030, South Korean women will live up to 90.82y; Swiss men will live up to 83.95y, these being longest living countries for each gender. Why do women outlive men even in rich, developed, non-warring counties?
• Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
• Can you generate electricity from the earths magnetic field?
• Would earthquakes still be deadly without buildings and other man-made structures?
• Is there a such thing as recurrent storms or blizzards that roughly occur every XX years?
• Is it theoretically possible to create a laser that emits radio waves?
• In an inelastic collision between 2 objects, how is it possible for momentum, but not kinetic energy, to be conserved?
• Why is the following wrong? (TL;DR I get i(pi)=0)
• (Astronomy) If space is a vacuum, why is it so cold? Where does the temperature "come from?"
• Is there a limit to the number of active Bluetooth connections in a confined space?
• Why does an impedance mismatch cause reflected waves in transmission lines?
• How are molecules filtered by chirality?

Are human the only animals that can use ketone bodies to fuel the brain? Posted: 22 Feb 2017 01:27 AM PST I recently heard that humans are the only animals that can use ketone bodies (B-hydroxybutyrate) to fuel their brains and I was wondering if this was true. Are other primates capable of doing this? If yes, which ones? In either case, is there any understanding of when this mutation appeared in humans/primates? It seems like the ability to maintain mental acuity in a fasted/starved state would certainly be a useful at whatever point in our history we became meat eating hunters. submitted by /u/Megalomania192 [link] [comments]

Is there a maximum length that a human hair can grow to? Posted: 21 Feb 2017 07:27 AM PST submitted by /u/clapper900 [link] [comments]

A recent Imperial College London study predicts that on average, by 2030, South Korean women will live up to 90.82y; Swiss men will live up to 83.95y, these being longest living countries for each gender. Why do women outlive men even in rich, developed, non-warring counties? Posted: 22 Feb 2017 04:14 AM PST *the longest living; *countries. Sorry, I was typing on the phone and I can't use Relay for posting questions on askscience submitted by /u/Redmond-Barry [link] [comments]

Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Posted: 22 Feb 2017 07:07 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]

Can you generate electricity from the earths magnetic field? Posted: 21 Feb 2017 03:16 PM PST This has always been a curiosity of mine. As people know, if you move a conductor through a magnetic field, a voltage is produced across the conductor and a current will flow as a result, all proportional to length of conductor, field strength, etc.. Classic generator theory. Now, this is where I'm confused. I'm pretty sure of my theory, but need some reddit advice! Here goes- The earths magnetic field runs north-south (or vice versa, I don't know), right? So, if you string up a long piece of wire in front of you spanning East-West, and dropped the wire parallel to the ground, will a voltage be produced on the ends of the conductor from the wire cutting through the earths magnetic field? I understand the energy produced will be absolutely miniscule at the most, but is my theory true? Ive thought of a couple concepts to aid with the efficiency by using an electronic compass to stay perpendicular and using sustainable kinetic energy for the movement of the conductor. But, really- ...Will it work? submitted by /u/Otus511 [link] [comments]

Would earthquakes still be deadly without buildings and other man-made structures? Posted: 21 Feb 2017 08:32 AM PST submitted by /u/AstyagesOfMedia [link] [comments]

Is there a such thing as recurrent storms or blizzards that roughly occur every XX years? Posted: 21 Feb 2017 09:48 AM PST I've heard people say California is overdue for its 200 year storm. Does it work like that? Can weather be cyclical? Or is this superstition? submitted by /u/not_a_lizard-person [link] [comments]

Is it theoretically possible to create a laser that emits radio waves? Posted: 21 Feb 2017 09:47 AM PST Can we, for instance, create a laser that emits radiation in the Citizen's Band as defined by the FCC (27 mhz)? submitted by /u/undercover_orb [link] [comments]

In an inelastic collision between 2 objects, how is it possible for momentum, but not kinetic energy, to be conserved? Posted: 21 Feb 2017 09:39 AM PST Surely if the kinetic energy of the system changes, then the velocities must have changed (obviously) and therefore the momentum must have changed. What am I missing here? Is it just an assumption to make calculations easier? submitted by /u/AHappyLurker [link] [comments]

Why is the following wrong? (TL;DR I get i(pi)=0) Posted: 21 Feb 2017 11:02 AM PST We know, from Euler's identity, that ei(pi) =-1 If we take the natural log of both sides, we get i(pi)=ln(-1) Doubling both sides gives 2i(pi)=2ln(-1) Simplifying gives 2i(pi)=ln(1)=0 So, obviously incorrectly, 2i(pi)=0 So what has gone wrong here? Is it the fact I took a logarithm of a negative, or is some of my reasoning flawed? Is this finding Re(2i(pi)) by some roundabout method? Thanks in advance. submitted by /u/coombermeister [link] [comments]

(Astronomy) If space is a vacuum, why is it so cold? Where does the temperature "come from?" Posted: 21 Feb 2017 09:47 PM PST submitted by /u/gelennei [link] [comments]

Is there a limit to the number of active Bluetooth connections in a confined space? Posted: 21 Feb 2017 06:10 AM PST submitted by /u/midasisking [link] [comments]

Why does an impedance mismatch cause reflected waves in transmission lines? Posted: 21 Feb 2017 08:51 AM PST When an RF transmission line is connected to a load whose impedance is not matched to the transmission line, there are reflections in the signal. A signal is reflected in the reverse direction of the source. How does the impedance mismatch cause the reflected signal? submitted by /u/000000000143 [link] [comments]

How are molecules filtered by chirality? Posted: 21 Feb 2017 05:37 AM PST Example: Of breathing medicines, I heard Xopenex is a subset of Albuterol that lacks one of the chiralities, so Albuterol has that molecule and its mirror but Xopenex doesnt. One of the mirrors affects the lungs, and the other affects the heart. Xopenex is more expensive because of this. How did they filter it? It seems nonintuitive how a mirror molecule could be filtered since physics tends to do things symmetricly. submitted by /u/BenRayfield [link] [comments]

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Why are we colder when wet?

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• Why are we colder when wet?
• Do microwaves kill bacteria?
• Did the introduction of antidepressants have any effect on suicide rates?
• If a stalactite or stalagmite were constantly exposed to air currents as they formed, would they grow in a slanted or curved direction?
• Is there a material that can change permeability based on electric charge?
• How do birds maintain spatial orientation in clouds?
• What does it mean that if you pull quarks apart, the energy required to do that creates more quarks beside each so there is never a lone quark?
• If liquid helium becomes too scarce and expensive, is there another substance that MRI machines can use for cooling?
• What is really happening in this natural phenomenon?
• How quickly does a diluted solution homogenize?
• How come moon's soil is rich in helium-3 when it has a very low escape velocity?
• Can a function that is identically 0 for x>a have a continuous derivative everywhere if for some x0 < a f(x0) > 0, f'(x0) < 0?
• What is the main source of protein for large herbivores?
• Is the sun (and any large body) surrounded by a layer of dark matter?
• With an aerodynamic shape, suitably powerful engines and a proportianate wingspan, could an aircraft of immense size still fly? Like, say, one the length and width of an average aircraft carrier?
• How do we collect information about children's thoughts before they can speak?
• Would it have been possible to watch the moon landings on earth?
• Does Earth's water escape into space? If so, will the planet eventually run out of water?
• How Geologist do calculate the elevation of terrain?
• Why does melting ice caps mean rising sea level?
• If it were possible for a star the size of a basketball to exist, how much energy would it produce, and how long would it take for it to expend all of it's hydrogen?
• Photons are continuously exchanged between electric charges - What is the source of this energy?
• If the Higgs mechanism explains how things have the property of mass, are similar mechanism needed to explain properties like electric charge?

Why are we colder when wet? Posted: 21 Feb 2017 04:36 AM PST submitted by /u/Hakimwithadream [link] [comments]

Do microwaves kill bacteria? Posted: 20 Feb 2017 09:51 AM PST I've always wondered if a microwave oven could be used as a disinfectant. Does it kill bacteria outright? Or is it the created heat in food/other elements that does the trick? submitted by /u/Bdoggy10 [link] [comments]

Did the introduction of antidepressants have any effect on suicide rates? Posted: 20 Feb 2017 09:57 PM PST submitted by /u/sericatus [link] [comments]

If a stalactite or stalagmite were constantly exposed to air currents as they formed, would they grow in a slanted or curved direction? Posted: 21 Feb 2017 04:37 AM PST submitted by /u/Legendtamer47 [link] [comments]

Is there a material that can change permeability based on electric charge? Posted: 21 Feb 2017 07:00 AM PST Imagine a membrane or valve that could open or close by introducing a current, changing polarity. Is there anything like this? Or being developed? submitted by /u/castles_of_beer [link] [comments]

How do birds maintain spatial orientation in clouds? Posted: 20 Feb 2017 07:36 PM PST Human experience in aviation has firmly cemented that trusting your vestibular system for orientation without reference to a horizon is impossible. The rate of error accumulation in your inner ear is rapid and results in aircraft in dangerous attitudes which pilots may not recognize if they do not have an artificial horizon (FAA Reference). My question is - do birds have similar trouble? How to do they maintain orientation in a cloud if they do not have a reference to the horizon? If they lose orientation, how would they regain it? Finally, and mostly out of curiosity, what are the limits of the environment that birds fly in? Will they fly into extreme up/downdrafts? Mountain wave? Icing conditions? submitted by /u/MOX-News [link] [comments]

What does it mean that if you pull quarks apart, the energy required to do that creates more quarks beside each so there is never a lone quark? Posted: 21 Feb 2017 06:16 AM PST Unlike the attraction of magnets or planets, quarks are attracted more the farther apart they get, at least when they're very close. Does it mean quarks are virtual particles (only representing vectors)? Does it mean space is an incompressible fluid of quarks where the "empty space" is made of some neutral combination of quarks? submitted by /u/BenRayfield [link] [comments]

If liquid helium becomes too scarce and expensive, is there another substance that MRI machines can use for cooling? Posted: 21 Feb 2017 07:14 AM PST submitted by /u/The_Safe_For_Work [link] [comments]

What is really happening in this natural phenomenon? Posted: 21 Feb 2017 03:26 AM PST Photos of the phenomenon Credit to Kjell H. Sæther for the photos. They were taken the night before February 20th 2017 in Karasjok, Norway. I've been told that this happens only when there's no wind, very cold (-25 celsius at the time) and has something to do with ice particles in the air. I assume the ice particles reflect the lights, but why does the light seem to form pillars? submitted by /u/Fuccaneer [link] [comments]

How quickly does a diluted solution homogenize? Posted: 21 Feb 2017 04:48 AM PST If I dissolve a compound in a solution of water and then were to dilute that solution, how quickly does the dissolved compound disperse evenly throughout the entire volume? Does the compound being dissolved play a role in the time it takes to homogenize? Does the concentration of the dissolved compound play a role in the time it takes to homogenize? In particular I am noticing a strange phenomenon when dissolving sodium lauryl sulfate in water and then diluting it with more water. Next adding Caltaine C-35, followed by glycerine once it appears everything has dissolved. After adding fragrance to this mix the final sometimes turns out the have the consistency of slime and then sometimes has the consistency of water. The amount of each compound is the same as well as the temperature each time. The only difference I can find is that when allowing the SLS a decent amount of time to mix and then allowing the C-35 a decent amount of time that the solution comes out with the consistency of water every time. submitted by /u/lxBATESxl [link] [comments]

How come moon's soil is rich in helium-3 when it has a very low escape velocity? Posted: 20 Feb 2017 10:35 PM PST submitted by /u/geosmine [link] [comments]

Can a function that is identically 0 for x>a have a continuous derivative everywhere if for some x0 < a f(x0) > 0, f'(x0) < 0? Posted: 20 Feb 2017 06:35 PM PST Asking this in the context of possible wavefunctions in a potential well. If a function goes to zero at some finite value but is nonzero before it, can its derivative be continuous across that interchange? It seems to me like there must be a cusp at x = a, but my real analysis background is too limited to verify this. submitted by /u/LorathiHenchman [link] [comments]

What is the main source of protein for large herbivores? Posted: 20 Feb 2017 04:21 PM PST Where does the protein needed by animals like horses or cows come from in the wild, other than the milk they had when they were still young? Do they get everything they need just from grass and some grains? If they do, wouldn't they need to eat way more than their own weight every single day, due to the small quantities of fats and protein grass has? submitted by /u/cocodecabra [link] [comments]

Is the sun (and any large body) surrounded by a layer of dark matter? Posted: 21 Feb 2017 12:32 AM PST I was listening to the Infinite Monkey Cage yesterday and they were saying that dark matter doesn't interact with normal matter in any way, except gravitationally. Does this mean that you could have huge, thick layers of dark matter orbiting stars and planets, but we just wouldn't be able to tell because we can't detect them? submitted by /u/MrGoerge [link] [comments]

With an aerodynamic shape, suitably powerful engines and a proportianate wingspan, could an aircraft of immense size still fly? Like, say, one the length and width of an average aircraft carrier? Posted: 20 Feb 2017 03:40 PM PST submitted by /u/MinuteDifference [link] [comments]

How do we collect information about children's thoughts before they can speak? Posted: 20 Feb 2017 09:10 PM PST Specifically, this question comes from me reading a Sociology textbook, in a portion talking on self-identity that says "Children do not grasp concepts such as 'I', 'me', and 'you' until age two or later." How would we collect information on this idea, and how can we infer that the information is definitively indicative to the absence of a child's understanding of self? submitted by /u/dextrousfuckery [link] [comments]

Would it have been possible to watch the moon landings on earth? Posted: 20 Feb 2017 05:33 PM PST Is there a powerful enough telescope that would allow a person here on earth to view the moon landings clearly? If so, is there anyone that that is known to have done it? submitted by /u/HarambeIsGOAT [link] [comments]

Does Earth's water escape into space? If so, will the planet eventually run out of water? Posted: 20 Feb 2017 05:05 PM PST submitted by /u/horseradishking [link] [comments]

How Geologist do calculate the elevation of terrain? Posted: 20 Feb 2017 08:43 PM PST submitted by /u/0Camus0 [link] [comments]

Why does melting ice caps mean rising sea level? Posted: 21 Feb 2017 04:04 AM PST When you drop some ice in water, mark the water level, wait for it to melt, the water level will stay the same, but why will the polar caps be any different? Shouldn't the sea level stay the same like the glass and the ice cube? I hope I explained my question well and thanks in advance! submitted by /u/sm9u [link] [comments]

If it were possible for a star the size of a basketball to exist, how much energy would it produce, and how long would it take for it to expend all of it's hydrogen? Posted: 20 Feb 2017 10:38 PM PST I have been googling around and haven't been able to find any answers to this question, so I was wondering if it would be possible to calculate the answer to this question, based on our current understanding of how fusion works? submitted by /u/Damadawf [link] [comments]

Photons are continuously exchanged between electric charges - What is the source of this energy? Posted: 20 Feb 2017 08:22 PM PST According to the Standard Model of particle physics (from what I understand), electric charge is mediated by photons. This means that the attraction/repulsion you feel between magnets is caused by photons continuously exchanged between the two materials. Where is that energy coming from?? Is it the "spin" of each electron? If so, what is powering the non-stop continuous spin of each electron? The electron's interaction with the Higgs field? submitted by /u/uncertaintyprincipia [link] [comments]

If the Higgs mechanism explains how things have the property of mass, are similar mechanism needed to explain properties like electric charge? Posted: 20 Feb 2017 11:57 AM PST submitted by /u/lockdiaverum [link] [comments]

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Are there ocean deserts? Are there parts of the ocean that never or rarely receive rain?

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• Are there ocean deserts? Are there parts of the ocean that never or rarely receive rain?
• Can Nuclear Reactors Become More Fuel Efficient?
• [Experiment] Which method would get the boiled water to lower temperature within the same amount of time?
• Can something be in a superposition between existing and not existing?
• What kind of research has been done for reliable long range communications?
• How do you calculate the coefficients of a polynomial regression?
• Is the charge of an electron an average?
• Does microwaving food really destroy nutrients?
• Why is it so difficult for particle accelerators to increase in energy, seeing as you need about 10000000 Tev for ~one Joule?
• Are there ocean dead zones where there is little or no life activity? If so why do they exist?
• Why is there a need for bigger particle accelerators? If we need to accelerate a particle to a higher speed, can't we just make it go several laps?
• What are the dangers of Particle Accelarators?
• Why not send a drone to Mars that can recharge with solar panels?
• Does elevation change affect birds the same way it affects humans? (Or any other land animal for that matter)
• What is the inner and outer horizon on a black hole?
• What is the speed of light moving relative to?
• If global warming is occurring, why haven't the sea levels risen?
• According to a recent study, oxygen levels in the ocean show signs of decreasing, around 2% less. Predictions for the end of the century were 7% less. What would happen to sea life in that scenario?
• Is it possible to seed the clouds so that the heavy rains that are causing problems in California release their water over the Pacific Ocean before reaching land?
• How does underwater pressure work in a cave system?
• [Physics] Is there zero point energy in liquids?
• What determines the top speed of an electric car, besides software limits?

Are there ocean deserts? Are there parts of the ocean that never or rarely receive rain? Posted: 19 Feb 2017 04:18 PM PST submitted by /u/AskyBear [link] [comments]

Can Nuclear Reactors Become More Fuel Efficient? Posted: 20 Feb 2017 06:56 AM PST I'm trying to gauge whether demand for uranium will increase in a more or less linear manner with an increase of the number of reactors (and demand for energy), or whether technological advances in reactor design could result in greater fuel efficiency and therefore steady or even declining demand for uranium even as more reactors come online. So, is the amount of energy released directly linked to the amount of fuel present, or is it possible to do more with less? Thanks for any replies! submitted by /u/DapperDarington [link] [comments]

[Experiment] Which method would get the boiled water to lower temperature within the same amount of time? Posted: 20 Feb 2017 01:23 AM PST You have two cups half full with boiled water. In one cup, let's call it cup "A", you fill the other half with cold water straight away and wait 10 min. In the other cup, let's call it cup "B", you wait 5 min before you fill the other half with cold water, then wait another 5 min. In which cup the water's temperature will be lower in the end of the 10 min? *Assuming all the variables are the same in both of the methods. In example, same water's starting temperature, cup's size and material, etc. Apologizes for the English, it's not my native language. submitted by /u/gimel182 [link] [comments]

Can something be in a superposition between existing and not existing? Posted: 19 Feb 2017 11:50 PM PST I know that with quantum superposition that something can exist in two different places at the same time, but can something be in a super position between existing and not existing? and how would that work? submitted by /u/PopularPlanet [link] [comments]

What kind of research has been done for reliable long range communications? Posted: 20 Feb 2017 03:30 AM PST I've wondered about this a few times while watching movies where they are sending communications that will take hours, days or even years to reach the destination. Is there any kind of protocol out there for reliable transfer of data over extremely long distances where the standard syn/ack process isn't feasible? If you're transferring to Mars you've got something like 11+ 3-21 minutes just to get there so sending back saying "we missed a packet" isn't really an easy way to do it. If you're transferring something that critically needs to be intact when it arrives like say a software patch, then corruption in transmission isn't something you want to be dealing with. So my thought was something like you end up sending your data 2-3 times with interspersed checksums of sections of the package to allow verification and the ability to rebuild corrupted packets at the other end. I mean this is only from a few minutes of thinking about it and not a ton of knowledge of how the transfers would be done or how the rebuilding could be done. I know that with newsfeeds there is some ability to rebuild damaged packages when they arrive. I don't know how that is done so that might be reliant on the source server to just rebuild without having to completely re-download. Unfortunately googling about this doesn't bring up much since the results are generally inundated with "I'm in Australia, why is my game so slow" kind of questions. submitted by /u/Verneff [link] [comments]

How do you calculate the coefficients of a polynomial regression? Posted: 20 Feb 2017 02:00 AM PST I'm currently writing a java program that outputs an array of the coefficients for a polynomial regression. For example for a linear regression: $\hat{y} = b_{0} + b_{1}\hat{x} $ I would take a data set and calculate $b{0}$ and $b{1}$. This is simple to do for a linear equation. $$b_{1} = \frac{SD_{x}}{SD_{y}}\cdot \frac{\sum \frac{x_{i} - \bar{x}}{SD_{x}} \cdot \frac{y_{i} - \bar{y}}{SD_{y}} }{n-1}$$ I'm having difficulty understanding what to do for nth polynomial regressions however. Can someone give me a simple explanation for how to calculate the coefficients for a polynomial regression? submitted by /u/BainCapitalist [link] [comments]

Is the charge of an electron an average? Posted: 19 Feb 2017 07:17 PM PST I know that the accepted value for the charge of an electron is 1.602e-19 C, but is this value the same for all electrons? submitted by /u/Man_Thighs [link] [comments]

Does microwaving food really destroy nutrients? Posted: 19 Feb 2017 11:19 PM PST My mother always told me not to microwave food because it killed all the good nutrients. But if a microwave produces non-ionizing radiation, then is anything really being destroyed? submitted by /u/blake_williamss [link] [comments]

Why is it so difficult for particle accelerators to increase in energy, seeing as you need about 10000000 Tev for ~one Joule? Posted: 19 Feb 2017 08:14 AM PST Couldn't we just pour an amount of energy measured in joules in, and see what happens? submitted by /u/TimAnEnchanter [link] [comments]

Are there ocean dead zones where there is little or no life activity? If so why do they exist? Posted: 20 Feb 2017 12:32 AM PST submitted by /u/taquitoburrito1 [link] [comments]

Why is there a need for bigger particle accelerators? If we need to accelerate a particle to a higher speed, can't we just make it go several laps? Posted: 20 Feb 2017 12:32 AM PST submitted by /u/thetimujin [link] [comments]

What are the dangers of Particle Accelarators? Posted: 20 Feb 2017 03:06 AM PST Yesterday I went to a museum exhibition on the Large Hadron Collider, and I am interested to know if there are any dangers/cons with a particle accelerator other than of course the price. I understand there was some controversy with Stephen Hawking saying the God Particle could destroy the universe? Is this referring to the Higgs Boson discovered in 2012? Why could it destroy the universe? I am writing my high school assignment on particle accelerators, and one of the criteria is to assess the pros and cons of using them (most people for the assignment are doing Nuclear power plants or Medicine, so instead I decided to do something more interesting). submitted by /u/UntameableBadass [link] [comments]

Why not send a drone to Mars that can recharge with solar panels? Posted: 19 Feb 2017 10:43 PM PST Since the Martian atmosphere is 0.6% of Earth's air density, the propellers will have to generate 166.6 times more thrust. However, since gravity is only 38% of Earth, 166.6 x 0.38 = 63.3 times more thrust. Why not increase the size of the propellers 8 fold? This will create 64 times the surface area and 64 times the thrust. Spinning huge propellers shouldn't be a problem because they won't face much air resistance. submitted by /u/bryceguy72 [link] [comments]

Does elevation change affect birds the same way it affects humans? (Or any other land animal for that matter) Posted: 19 Feb 2017 03:14 PM PST submitted by /u/DemopanRocks [link] [comments]

What is the inner and outer horizon on a black hole? Posted: 19 Feb 2017 09:56 AM PST My question originates from this sentence on the Wikipedia page about the black hole in S5 0014+81: "The Schwarzschild radius of this black hole is 118.35 billion kilometers. So, this black hole has an external horizon showing a diameter of 236.7 billion kilometers" I thought that the event horizon is formed at the Schwarzschild radius of an object. I have seen diagrams of Kerr black holes displaying an inner and outer horizon but I do not understand what that means. submitted by /u/ev3nth0rizon [link] [comments]

What is the speed of light moving relative to? Posted: 19 Feb 2017 08:00 PM PST My longer question is this: If, for example, a planet launches a spaceship in the direction of their momentum that is going the planet's speed +1/10th the speed of light... then the ship launches a shuttle in the same direction that is going the planet's speed + the ship's speed +1/10th the speed of light. After 10 iterations, would the last object be going the speed of light relative to the planet? Or am I completely misunderstanding physics? submitted by /u/seemslucky [link] [comments]

If global warming is occurring, why haven't the sea levels risen? Posted: 20 Feb 2017 03:12 AM PST Not a climate change denier, just genuinely curious. submitted by /u/All_thingsConsidered [link] [comments]

According to a recent study, oxygen levels in the ocean show signs of decreasing, around 2% less. Predictions for the end of the century were 7% less. What would happen to sea life in that scenario? Posted: 19 Feb 2017 04:10 PM PST Also, what RCP are they basing that study off of? submitted by /u/shreditorOG [link] [comments]

Is it possible to seed the clouds so that the heavy rains that are causing problems in California release their water over the Pacific Ocean before reaching land? Posted: 19 Feb 2017 06:21 PM PST I'm referring to the story in the link below where the "atmospheric river" looks narrow enough to focus your cloud seeding efforts on. http://mashable.com/2017/02/17/atmospheric-river-california-storm-flooding/?utm_cid=hp-h-33#ynQeRjpVJOqO submitted by /u/tomg288374 [link] [comments]

How does underwater pressure work in a cave system? Posted: 19 Feb 2017 02:06 PM PST If you're in an cave system on the ocean floor, is the pressure the same in said cave as outside at the same depth of any given point of the cave? Or more? Or less? submitted by /u/Deltair114 [link] [comments]

[Physics] Is there zero point energy in liquids? Posted: 19 Feb 2017 03:32 PM PST Do liquids have bulk vibrational states like phonons in solids? submitted by /u/bearsnchairs [link] [comments]

What determines the top speed of an electric car, besides software limits? Posted: 19 Feb 2017 06:36 PM PST Related question: what about the max RPM of an electric motor not attached to a car? My understanding is that an electric motor can spin as fast as you can alternate the current, until some kind of counteracting force becomes too strong or the motor destroys itself. submitted by /u/SirNanigans [link] [comments]

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