Why is an air bubble in your blood dangerous?

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• Why is an air bubble in your blood dangerous?
• Is there a rule of thumb for maximizing the magnetic field when making a solenoid?
• Is there a website where one can see the line spectra for every element?
• Why is lead so dense but so soft, aluminium so light but also soft, but then tungsten is very dense but incredibly hard and titanium is so light but also really hard?
• Can a charged metal object be accelerated with an electric field the same way rail guns use magnetic fields?
• What causes people to act different when drinking than when sober?
• Whats stopping us from using H2O electrolysis as energy storage for solar arrays?
• How have the nutritional value of crops such a wheat changed over the last 1000 years and why?
• Why does water put out fire?
• Why do teeth tend to revert towards their old alignment once you stop wearing braces?
• If I was to be in space next to Pluto, and my speed relative to the Sun was stopped, how long would it take me to fall into it and how fast would I be going?
• Why is flu fatal?
• How does climate change affect violence... and why is there seemingly more violence in hotter locations?
• Can sleeping in a draft cause you to become sick?
• Do we know why the mumps virus targets the parotid gland over any others?
• What causes certain types of brain tumors to affect children rather than adults?
• Do (Can we determine if) binary stars revolve in opposite directions?
• As an adult, is it possible to hook up your belly button again to an artificial 'umbilical cord' for life support like when you were in the womb?
• Can LIGO pinpoint the position of black hole collisions?
• What would an observer see when a distant object (such as a star) approached the speed of light?
• Would having a star which emits more radiation cause evolution to happen faster?
• GPS failure without relativity?
• When clown-fish change gender, what actually happens to them?

Why is an air bubble in your blood dangerous? Posted: 23 Jun 2016 01:45 PM PDT submitted by /u/gamehunter135 [link] [comments]

Is there a rule of thumb for maximizing the magnetic field when making a solenoid? Posted: 23 Jun 2016 04:17 PM PDT As a physicist I'm a bit embarrassed asking this, but this is something I've never "gotten." I know all about how to calculate the B-field in a solenoid, but in a practical sense I'm not sure how I would go about designing one if I want the most bang for my voltage source. For example, suppose I have a 12 V car battery (so I can max out at ~100A without running out of juice too fast). So the parameters I'm working with are: 12V, and up to 100A. That's 1200W which is a lot of heat to dissipate, but let's just ignore that factor completely. My question is: what gauge wire and how many turns should I use to most judiciously use my 12 V to generate the B field? Of course I want both high current and number of turns, but higher gauge wire will give you lower current for a given length and higher turn density, and higher gauge wire will give you lower current for a given length and higher turn density. Sure, I could go ahead and work it all out, making some really complicated formulas involving wire diameter as a function of gauge, resistance as a function of gauge and wire length, wire length as a function of solenoid thickness and length, and so on, but shouldn't there be a "solenoid-maker's rule of thumb" somewhere? After all, isn't this like, the most common calculation anyone would ever want to do regarding solenoids, so as to not waste electricity and build materials in getting the desired B-field? submitted by /u/ididnoteatyourcat [link] [comments]

Is there a website where one can see the line spectra for every element? Posted: 24 Jun 2016 05:19 AM PDT submitted by /u/LeoSaysNO [link] [comments]

Why is lead so dense but so soft, aluminium so light but also soft, but then tungsten is very dense but incredibly hard and titanium is so light but also really hard? Posted: 24 Jun 2016 05:43 AM PDT What's going on with the atoms that makes all these characteristics interchangeable? submitted by /u/MrWillWalker [link] [comments]

Can a charged metal object be accelerated with an electric field the same way rail guns use magnetic fields? Posted: 24 Jun 2016 04:48 AM PDT For example: if I had a ball bearing with a net charge, and it was held in a vacuum, could I push it along without touching it by using an increasingly strong electric field? And could I do the reverse, slowing it down? How efficient would this be, since it's frictionless? submitted by /u/Zirbs [link] [comments]

What causes people to act different when drinking than when sober? Posted: 23 Jun 2016 12:25 PM PDT submitted by /u/Dipesh35 [link] [comments]

Whats stopping us from using H2O electrolysis as energy storage for solar arrays? Posted: 23 Jun 2016 10:57 PM PDT I know that one of the bigger costs in solar energy is finding a way to store all the energy you gather during the day for later use, so my question is, why use batteries? Is it feasible to try and electrolyse water from the electricity created by your solar array, storing the oxygen and hydrogen gas to be used in the future via a voltaic cell setup to produce electricity for a household? As a bonus, these personal reservoirs could be used as fuel for a fuel cell vehicle theoretically. What do you think? Would it be feasible? Or is there some huge issue with it that im not aware of? submitted by /u/saladtossing42 [link] [comments]

How have the nutritional value of crops such a wheat changed over the last 1000 years and why? Posted: 24 Jun 2016 06:25 AM PDT submitted by /u/Duck_with_a_monocle [link] [comments]

Why does water put out fire? Posted: 24 Jun 2016 06:22 AM PDT Okay...... you're probably reading the title and thinking it's a stupid question. but scientifically, why does it? fire is the product of combustion (most often), and in combustion, it forms water. so is it because of le'chattliers principle? submitted by /u/aaa111sss222 [link] [comments]

Why do teeth tend to revert towards their old alignment once you stop wearing braces? Posted: 24 Jun 2016 05:54 AM PDT As far as I'm aware, there is new growth of bone pertaining to the new alignment through bone remodeling. So what factors force the alveolar bone to go back to it's older configuration? submitted by /u/portmantoux [link] [comments]

If I was to be in space next to Pluto, and my speed relative to the Sun was stopped, how long would it take me to fall into it and how fast would I be going? Posted: 23 Jun 2016 07:16 PM PDT If my speed relevant to the Sun was to be stopped completely, how long would it take for me to fall into the Sun because of gravity? submitted by /u/Liveonafarm [link] [comments]

Why is flu fatal? Posted: 24 Jun 2016 07:25 AM PDT Everyone gets the sniffles occasionally. So what makes the flu occasionally epidemic and more importantly deadly? (Spanish flu killed more than any disease in a single go!!) The internet says that flu suppresses the immune system and becomes fatal because of the prevailing condition such as asthma, kidney patients etc. It also says that children and the elderly are more prone. However, I remember (and later verified) a news report saying that the first victim of the Swine flu that hit in 2009 was a healthy young woman and so were the next few victims. So what is it exactly?? submitted by /u/pratha1994 [link] [comments]

How does climate change affect violence... and why is there seemingly more violence in hotter locations? Posted: 24 Jun 2016 07:24 AM PDT I wanted to get some good opinions on this article from people who know more about biology, sociology, and climate science. I lived in Ghana for a year and having lived in that heat, humidity, and lack of seasonal changes in temperature and sunlight, i have a personal interest in knowing if theres anything to the theories presented in this article. So...anyone can explain to me any other good reasons why there seems to be more violence in hotter locations?! Many thanks! submitted by /u/Coolfuckingname [link] [comments]

Can sleeping in a draft cause you to become sick? Posted: 24 Jun 2016 07:20 AM PDT I've heard the argument that being cold can depress your immune system and make you more likely to get sick. however when I google it, I find many popular science sources saying it's not true. I haven't been able to find any studies, and would greatly appreciate it if people could provide some evidence either way! submitted by /u/heapsofsheeps [link] [comments]

Do we know why the mumps virus targets the parotid gland over any others? Posted: 24 Jun 2016 03:24 AM PDT submitted by /u/BoydOrr [link] [comments]

What causes certain types of brain tumors to affect children rather than adults? Posted: 24 Jun 2016 07:02 AM PDT I've read about medulloblastomas affecting young children at a rate of 10x that of adults, and also that pilocytic astrocytoma is primarlily found in children. What causes this? Are the tumors very fast growing? Are they formed in embryo? Do they not follow the typical carcenogenesis route? And also, why does this phenomenon seem to be isolated to brain tumors? Why don't we see similar juvenile liver cancer? Or lung cancer? submitted by /u/NorthBus [link] [comments]

Do (Can we determine if) binary stars revolve in opposite directions? Posted: 23 Jun 2016 04:34 PM PDT We are able to photograph Sol and see its sunspots traveling across its surface, indicating rotation. Do we have any way of determining the rotational direction of other stars? I've read the majority of stars are binaries. If they rotate in opposite directions, is it reasonable to suspect a mass traveled through the accretion cloud, when the stars were forming, causing two eddies, counter-rotating? submitted by /u/chung_my_wang [link] [comments]

As an adult, is it possible to hook up your belly button again to an artificial 'umbilical cord' for life support like when you were in the womb? Posted: 24 Jun 2016 06:06 AM PDT Just wondering if the connections for life support are still inside your body or if they deteriorate as you grow up after birth. submitted by /u/Gern1 [link] [comments]

Can LIGO pinpoint the position of black hole collisions? Posted: 24 Jun 2016 02:11 AM PDT With the possible news about LIGO and dark matter (Did LIGO detect dark matter?), I was led to wonder: When LIGO detects something like a black hole collision, is there any way to figure out where the collision happened? I know there are two detectors--are they far enough apart to do some kind of parallax computation? Would pinpointing the location give evidence for or against the primordial black hole hypothesis? submitted by /u/BanskiAchtar [link] [comments]

What would an observer see when a distant object (such as a star) approached the speed of light? Posted: 23 Jun 2016 05:14 PM PDT Would it appear frozen in time, or would its life cycle appear to speed up? Also would the rate of dark matter expansion accelerate to this speed? submitted by /u/ThorpedoUnicorn [link] [comments]

Would having a star which emits more radiation cause evolution to happen faster? Posted: 23 Jun 2016 05:18 PM PDT submitted by /u/striker7770 [link] [comments]

GPS failure without relativity? Posted: 23 Jun 2016 05:50 PM PDT So I understand that relativity has been proven time and again. I have a decent working knowledge of physics and understand time dilation (is that the right word?) based on relative velocity and proximity. But how would a lack of that understanding prevent my car from telling me where to go? I guess my question is more how does the Global positioning satellite system work with respect to relativity? I don't understand the necessity for the application of relativity at short distances and slow velocity (compared to ly and c). submitted by /u/LegendofPisoMojado [link] [comments]

When clown-fish change gender, what actually happens to them? Posted: 23 Jun 2016 07:55 AM PDT I recently heard that if a group of clown-fish is lacking a female, one of the males will change gender. What actually happens in their body, do they already have reproductive organs of both genders, or do they grow them when they change. Also what happens in their DNA, does it change? Thank you submitted by /u/twolt [link] [comments]

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Science AMA Series: Hi, I’m Dr. Kerry Assil, Eye Surgeon For The LA Kings And Founder Of The Assil Eye Institute, AMA!

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• Science AMA Series: Hi, I’m Dr. Kerry Assil, Eye Surgeon For The LA Kings And Founder Of The Assil Eye Institute, AMA!
• If there are a finite number of atoms in the entire universe, that means there is still a finite number of permutations of atoms possible. Can our very existence occur again then on a infinite time scale if we are just made out of a certain permutation atoms?
• How does the Maxwell-Boltzmann distribution allow us to solve the probability of particular particle arrangements over a given of time?
• If pi stops having any practical use after it reaches a finite number of digits, how can mathematicians discover the digits that come after this limit?
• Does the Moon's gravity have a tidal effect on bodies of liquid that are underground?
• Are the physics in Total Recall correct?
• Can photons be used as propulsion?
• One of the most fundamental principles taught is that everything wants to be in the lowest energy state possible. Why is this the case?
• If, during a fusion event, the binding energy per nucleon is increased dramatically, how can energy also be released from the event?
• Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology
• How significantly is light affected by moving through a medium that is in motion?
• Can water be compressed?
• Would a dobule pendulum, in vacuum and a system with no friction, if released from the top eventually do a full circle area?
• How come in sword fights, one sword can not slice through another?

Science AMA Series: Hi, I’m Dr. Kerry Assil, Eye Surgeon For The LA Kings And Founder Of The Assil Eye Institute, AMA! Posted: 23 Jun 2016 05:00 AM PDT Hi reddit! I'm a renowned eye surgeon, researcher and lecturer who has worked with the LA Lakers, Kings, numerous other Gold-metal athletes and A-list celebrities. I have spent the last 20+ years of my career working with the most advanced and cutting edge technologies to improve vision and eye health. I know what works, what doesn't, the newest implantable lenses, the biggest myths & fears of so many Americans that may be avoided, if they only had the right information. June is Cataract Awareness Month and it's always been associated as a grandma's issue – well, no longer. Cataracts are now affects Americans as young as their late 40s and 50s! I'll be back at 3:30 pm EST (12:30 pm PST, 8:30 pm UTC) to answer your questions, ask me anything! submitted by /u/Dr_Kerry_Assil [link] [comments]

If there are a finite number of atoms in the entire universe, that means there is still a finite number of permutations of atoms possible. Can our very existence occur again then on a infinite time scale if we are just made out of a certain permutation atoms? Posted: 22 Jun 2016 07:20 PM PDT submitted by /u/xSialicAcidx [link] [comments]

How does the Maxwell-Boltzmann distribution allow us to solve the probability of particular particle arrangements over a given of time? Posted: 23 Jun 2016 05:18 AM PDT I have been reading Max Tegmark's book "Our Mathematical Universe" and in later chapters he briefly discusses that the Maxwell-Boltzmann Distribution shows that the probability of a particular arrangement of molecules, such as the exact molecular structure of your brain, complete with all your thoughts and memories is more likely to occur in other regions of space and/or other universes (Many-Worlds interpretation of Quantum Mechanics) than through evolution. This is known as the Boltzmann Brain and is a hypothesized self aware entity which arises due to random fluctuations out of a state of chaos. submitted by /u/Kaoslogic [link] [comments]

If pi stops having any practical use after it reaches a finite number of digits, how can mathematicians discover the digits that come after this limit? Posted: 22 Jun 2016 05:20 PM PDT Sources like this ( http://gizmodo.com/5985858/how-many-digits-of-pi-do-you-really-need ) claim that the "the circumference of the observable universe" can be measured "to within the width of a single hydrogen atom" with only about 39 digits of pi. So how can any more specific calculations of pi be accurately measured? submitted by /u/MaxHasThisThing [link] [comments]

Does the Moon's gravity have a tidal effect on bodies of liquid that are underground? Posted: 23 Jun 2016 06:56 AM PDT The Moon's gravitational pull is known to cause the tides in the world's oceans, which got me wondering whether or not underground bodies are similarly affected, eg. aquifers/water courses, water in cave systems, oil fields etc. The Moon's gravity affects liquids on the surface from 384,000km away, so surely it isn't inconceivable that this effect is also going on simultaneously under the surface? submitted by /u/big_mad_andy [link] [comments]

Are the physics in Total Recall correct? Posted: 22 Jun 2016 01:53 PM PDT For those who haven't seen the movie, it features a tunnel between Australia and Britain, which allows fast travel in a giant vehicle that is dropped down the shaft, to emerge at the other side. I'm fine with that part (and ignoring the impossibility of constructing such a thing), what I'm questioning is the forces experienced by the people in the vehicle. For the 'downward' leg of the journey, while the vehicle is in freefall, they seem to experience gravity just the same as if they were standing on the surface. When they near the core (going past it rather than directly through), there is a period of weightlessness, then on the 'upward' part of the journey they appear to experience normal gravity again, in the other direction (the seats rotate so they aren't upsidedown). So, is this correct? submitted by /u/Fellowship_9 [link] [comments]

Can photons be used as propulsion? Posted: 22 Jun 2016 11:07 AM PDT Can photons or light be used as propulsion? If so, how would we create propulsion with photons and how efficient would it be? submitted by /u/Shiloh_the_dog [link] [comments]

One of the most fundamental principles taught is that everything wants to be in the lowest energy state possible. Why is this the case? Posted: 22 Jun 2016 08:54 AM PDT Is there a subatomic explanation? Or is this just the way it is for this dimension? submitted by /u/TheBiclops [link] [comments]

If, during a fusion event, the binding energy per nucleon is increased dramatically, how can energy also be released from the event? Posted: 22 Jun 2016 07:37 AM PDT submitted by /u/CantThinkk [link] [comments]

Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology Posted: 22 Jun 2016 08:05 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Economics, Political Science, Linguistics, Anthropology 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]

How significantly is light affected by moving through a medium that is in motion? Posted: 22 Jun 2016 10:53 AM PDT For example, (and please excuse the crudeness of this diagram and of my handwriting), would photons get stuck here, where they're swimming upriver just as fast as the current is flowing, so to speak. submitted by /u/milkdrinker7 [link] [comments]

Can water be compressed? Posted: 22 Jun 2016 08:09 AM PDT For example, if I had a cylindrical container half full (or half empty =p ) of water, and I also had a piston that perfectly fit the container, enough so that no water could escape through the crack, would the water be compressed into denser water? Would the water turn into steam? Would the piston not be able to push down onto the water? If said piston wasn't able to push down onto the water, what if I had an infinitely strong piston pushing down onto the water as well as an infinitely strong container holding the water? submitted by /u/oddonesmishapenhead [link] [comments]

Would a dobule pendulum, in vacuum and a system with no friction, if released from the top eventually do a full circle area? Posted: 22 Jun 2016 06:51 AM PDT If all the dots combined would be equall the the number of all the dots in a circle with the area of 2rpi with r the lenght of the pendulum? submitted by /u/Beshtija [link] [comments]

How come in sword fights, one sword can not slice through another? Posted: 21 Jun 2016 10:53 PM PDT With both swords swinging at each other with great force, and both have extremely sharp edges, how is it that neither be chopped or broken by the other? submitted by /u/Mathkushd [link] [comments]

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AskScience AMA Series: I am /u/pengdrew, a physiologist that studies Penguins! I study the physiology of aging in wild penguin species and am here to any questions you have about penguins, aging and physiology/ecology! AMA!

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• AskScience AMA Series: I am /u/pengdrew, a physiologist that studies Penguins! I study the physiology of aging in wild penguin species and am here to any questions you have about penguins, aging and physiology/ecology! AMA!
• What's happening in my brain when someone says something to me, then I ask "what?" and immediately realize I heard them perfectly in the first place?
• Is evolution guaranteed where there's life?
• When talking about brain waves, what actually are these waves?
• The diagnosis rate of depression is 6.7% of adults, so why is it as a "disorder" if having the condition is not a statistical anomaly?
• What makes Quantum mechanics and the General Theory of Relativity incompatible?
• What is a lens flare and why does it happen?
• Why are 1, 3, 7, and 9 the only numbers whose multiples can end in any digit?
• What are meteorites made from?
• Is there any material that is not a solid at absolute zero?
• If you exercise when it's hot outside, you certainly feel more tired, but do you actually burn more calories?
• How does inhaling work? You're not creating a vacuum or something, right?
• If the Dead Sea is 400m below sea level, would it be possible to refill it to sea level by simply building a canal to it from the Mediterranean?
• If two black holes spinning in opposite directions of each other were to come close to one another and eventually merge, what would happen to the event horizon before and after merging?
• Do gravitational waves get "red" shifted like light and radio waves do?
• Are there objects far enough away from us that light they have emitted has never reached Earth, but will in the future? Or are all such objects traveling away from the Earth faster than the speed of light?
• How can the quality of a video deteriorate if it is uploaded, downloaded and re-uploaded to and from the same location?
• An object in space gives off sound waves with the same amount of energy as light radiation from the Sun and at the same distance from Earth as the Sun. Would we be able to hear the sound on Earth?
• How does a stem cell know in which way it has to specialize depending on its place in the embryo ?
• If I electrify the pan I am using for melting a chocolate bar, will it have any results the article mentions?
• Do we experience time dilation relative to the rest of the universe? If so, how does it affect us?
• Gas expands when heated. Gas cools when it expands. What gives?
• Would a empty hard disk weight differently than a full one? (considering both hard disks are identical)
• How to achieve a perpetual sunset?

AskScience AMA Series: I am /u/pengdrew, a physiologist that studies Penguins! I study the physiology of aging in wild penguin species and am here to any questions you have about penguins, aging and physiology/ecology! AMA! Posted: 22 Jun 2016 04:20 AM PDT Hi Reddit! I am a PhD physiologist and ecologist studying the physiology of aging in wild penguins! I am currently in the second year of my PostDoc studying stress hormones, aging, and ecology in Spheniscus penguins. Specifically my work explores the relationship between stress hormones, telomeres and life-history decisions (reproduction, mating, growth, etc) in a very long-lived seabird! I'm excited to talk about: Penguin Biology Physiology of Aging / Physiological Ecology Penguin & Seabird Ecology General Physiology/Ecology Graduate School & PostDoc in Biology Other fun stuff! A few other notes on me: B.A. in Biology from a small Liberal Arts College (gasp!) PhD in Biology from a Top R1 University. I will be here from 12:00pm - 2:00pm PST (15 ET,20 UTC) to answer your questions…AMA! submitted by /u/AskScienceModerator [link] [comments]

What's happening in my brain when someone says something to me, then I ask "what?" and immediately realize I heard them perfectly in the first place? Posted: 21 Jun 2016 01:50 PM PDT submitted by /u/realandrei [link] [comments]

Is evolution guaranteed where there's life? Posted: 22 Jun 2016 06:07 AM PDT Recently I read a New York Times article saying that, if we use Drake's equation as a general guideline, then we should believe that it is extraordinarily likely that intelligent life besides ours has appeared at some point in our galaxy. The article failed to explain why we should assume that evolution occurs anywhere where life appears. Why should we assume this? Aren't there reasons to withhold this assumption? We have only seen how living organisms behave on earth, and their behavior here is no credible model for their behavior elsewhere. Maybe evolution is a necessary consequence of living organisms striving for survival, but how can we assume that life elsewhere would also strive for survival, as it does on earth? Even if it did and evolution followed, how can we assume that evolution's trajectory elsewhere would lead towards something like human intelligence? Why not just a bunch of highly specialized organisms - highly speciated, but nothing like rational and technological species. If we can't back up these assumptions, then isn't Drake's equation pretty unsubstantiated? submitted by /u/waitinround2d [link] [comments]

When talking about brain waves, what actually are these waves? Posted: 22 Jun 2016 12:55 AM PDT What are the waves representing? Is it simply a function of brain activity? Does activity occur in waves? If so, why does it occur in waves and not a steady stream? submitted by /u/UnclePutin [link] [comments]

The diagnosis rate of depression is 6.7% of adults, so why is it as a "disorder" if having the condition is not a statistical anomaly? Posted: 22 Jun 2016 03:21 AM PDT Is this a problem with our definition of depression? Our diagnosis rate? Why do we refer to depression as being "abnormal" when "normal" (not depressed) fails 95% confidence? submitted by /u/blackholymoly [link] [comments]

What makes Quantum mechanics and the General Theory of Relativity incompatible? Posted: 22 Jun 2016 02:08 AM PDT I am reading The Elegant Universe by Brian Green. Right at the beginning Brian says that Quantum mechanics and General Theory of Relativity aren't compatible with each other, ie, they both can't coexist under the same set of laws. But he never explains and details what's making it so. Can someone enlighten me where they clash? submitted by /u/antistar88 [link] [comments]

What is a lens flare and why does it happen? Posted: 22 Jun 2016 05:16 AM PDT Here's an example of what I'm talking about http://www.psdgraphics.com/file/lens-flare-effect.jpg submitted by /u/oddonesmishapenhead [link] [comments]

Why are 1, 3, 7, and 9 the only numbers whose multiples can end in any digit? Posted: 21 Jun 2016 06:58 PM PDT Obviously 1 can multiply into anything. Multiples of 7 can end in any digit 0 through 9 07 14 21 28 35 42 49 56 63 70 Same for 3 03 06 09 12 15 18 21 24 27 30 And 9 09 18 27 36 45 54 63 72 81 90 But 2, 4, 5, 6, and 8 won't do it. submitted by /u/_Username-Available [link] [comments]

What are meteorites made from? Posted: 22 Jun 2016 05:00 AM PDT Title pretty much explains it all, it's always interested me, like are they granite? Because surely that would imply they were formed volcanically, or are they just pure elements? submitted by /u/patienceandthyme [link] [comments]

Is there any material that is not a solid at absolute zero? Posted: 21 Jun 2016 03:24 PM PDT submitted by /u/harald705 [link] [comments]

If you exercise when it's hot outside, you certainly feel more tired, but do you actually burn more calories? Posted: 22 Jun 2016 05:39 AM PDT submitted by /u/nirvanna94 [link] [comments]

How does inhaling work? You're not creating a vacuum or something, right? Posted: 21 Jun 2016 07:40 PM PDT submitted by /u/kmaheynoway [link] [comments]

If the Dead Sea is 400m below sea level, would it be possible to refill it to sea level by simply building a canal to it from the Mediterranean? Posted: 21 Jun 2016 01:53 PM PDT submitted by /u/hoikarnage [link] [comments]

If two black holes spinning in opposite directions of each other were to come close to one another and eventually merge, what would happen to the event horizon before and after merging? Posted: 21 Jun 2016 02:21 PM PDT My buddy and I were talking about this in regards to the milky way and andromeda merging and what would happen if Sagittarius A and andromeda's black hole at the galactic core were to hypothetically merge with one another. So would the event horizon increase, decrease, or do some things that we simply don't know yet? submitted by /u/a-rabid-hamster [link] [comments]

Do gravitational waves get "red" shifted like light and radio waves do? Posted: 21 Jun 2016 09:47 AM PDT With improved instruments for Gravitational Wave Astronomy, it seems science will soon be able to listen in to ever distant black hole collisions and other similar events. I'm curious if there is any property of the gravitational distortion that is directly affected by expansion of the universe? Thank you. submitted by /u/BrightGene [link] [comments]

Are there objects far enough away from us that light they have emitted has never reached Earth, but will in the future? Or are all such objects traveling away from the Earth faster than the speed of light? Posted: 21 Jun 2016 08:32 PM PDT The universe is isotropic and expanding, so everything is moving away from everything else. Are there light-emitting objects far enough away from the Earth and moving fast enough that in the ~14 billion years of the universe's existence their light has never reached us? If there are, will that light ever reach us? Or is impossible based on the geometry of the universe? submitted by /u/pelzhaus [link] [comments]

How can the quality of a video deteriorate if it is uploaded, downloaded and re-uploaded to and from the same location? Posted: 21 Jun 2016 06:37 PM PDT This question comes from this post where he uploaded and downloaded and re-uploaded the same video 1000 times. My thinking is this: Let's say you export a video, and take the SHA1Sum of the exported file. (For my knowledge a SHA1Sum verifies that a file downloaded is the same as the source file.) Then you upload and download the file, and compare its SHA1Sum to the original SHA1Sum. I imagine that they would be the same, because the same file was uploaded and downloaded. Now if the process was repeated 1000 times, I still would think that the SHA1Sum's would be identical. I thought that maybe it was YouTubes processing of the video which deteriorated it over time causing a change in the SHA1Sum, so to exclude that factor, instead of uploading to youtube, what if it were uploaded to Dropbox, Google Drive, or even just another computer on the same network. What causes this video deterioration if the SHA1Sums do not change? submitted by /u/HiddenGhost14 [link] [comments]

An object in space gives off sound waves with the same amount of energy as light radiation from the Sun and at the same distance from Earth as the Sun. Would we be able to hear the sound on Earth? Posted: 21 Jun 2016 06:36 PM PDT Sorry if this doesn't make sense. It could help to read the inspiration for this submission, which was a recent comment on r/blind (last paragraph). submitted by /u/gelema5 [link] [comments]

How does a stem cell know in which way it has to specialize depending on its place in the embryo ? Posted: 21 Jun 2016 12:03 PM PDT Science books from high school told me it was because of its location. So yeah, kinda obvious, cells on the top become "head", cells on the bottom become "bottom". But which factor influence this? How does one cell knows it is "on the top" ? Maybe I am wrong about this, please correct me. submitted by /u/MrSydFloyd [link] [comments]

If I electrify the pan I am using for melting a chocolate bar, will it have any results the article mentions? Posted: 21 Jun 2016 01:53 PM PDT Here is the post with the article I refered in the title: https://www.reddit.com/r/science/comments/4p3rug/scientist_discovered_that_by_running_liquid/ It's actually a honest question and not a try on /r/askshittyscience. submitted by /u/Soudescolado [link] [comments]

Do we experience time dilation relative to the rest of the universe? If so, how does it affect us? Posted: 22 Jun 2016 12:23 AM PDT In Vsauce's most recent video, he said that relative to the Cosmic Background Radiation of the universe earth is traveling at approximately 2.1 million kilometers per hour. When I watched this, I was a little shocked at first, because that seemed really damn fast. So... What is the validity of this? If it's true, what affects does this have on astronomy and humanity? submitted by /u/anerdson [link] [comments]

Gas expands when heated. Gas cools when it expands. What gives? Posted: 21 Jun 2016 01:42 PM PDT It's been about a decade since I took AP chemistry...I can remember some things like "gas solubility in liquid increases as temperature of solvent decreases," but I can't remember why. It seems, intuitively, that if adding heat makes a gas expand, then an expanded gas should have more heat. What am I missing? submitted by /u/igottennispenis [link] [comments]

Would a empty hard disk weight differently than a full one? (considering both hard disks are identical) Posted: 22 Jun 2016 06:13 AM PDT submitted by /u/not_an_ottoman [link] [comments]

How to achieve a perpetual sunset? Posted: 21 Jun 2016 08:23 PM PDT Hello /r/askscience, I have a peculiar question for you. I'm a huge fan of sunsets, and was wondering if it was possible to catch one on land. And it isn't. But by plane it is, as you have to be traveling about 1000mph by jet. However is there such an altitude (or it may even be considered an orbit at some point) at which you could cruise at a comfortably slow speed and watch a perpetual sunset for a few hours at a time? submitted by /u/jacobyflynn [link] [comments]

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