Do tattoos protect the skin from sun damage?

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• Do tattoos protect the skin from sun damage?
• Is There a 100% Reflective Surface?
• If the atmosphere was twice as dense, would fluctuations in weather be more or less severe?
• What exactly is a photon?
• How is negative nuclear binding energy (BE/A) possible?
• Can an object become a black hole by moving fast enough?
• What's so special about Earth's axial tilt of 21° 1/2 degrees?
• When I eat seafood or other things cooked whole (lobsters, octopus, crabs), why can't I identify any organs?
• Where do courtship rituals among birds come from and more specifically how are they passed along from generation to generation?
• Would it be possible to build a large double slit experiment to examine the behavior of gravitational waves? If so, would that be proof that gravitons exist?
• How were the ancestors of modern birds able to survive the mass extinctions that killed off the dinosaurs?
• How far back do infectious diseases go in prehistory?
• Why is magnetic inequivalence not a problem in 13C NMR?
• Why do molecules tend towards lower potential energy?
• How large does a piece of land have to be before it is no longer considered an island?
• Why is iron-oxide considered a ceramic and not a metal?
• How Doesn't Earth Get Pulled Into The Sun?
• Do some people heal faster than others? Bones, cuts, etc.. Assuming the same treatment of injury?
• What are selectable markers? My book has confused me. How are they used to identify among recombinants|non-recombinants and transformants|non-transformants?
• What happens if a quark falls into an event horizon?
• Why does the launch of a geostationary satellite have a launch window?
• How does the Einstein-Szilard refrigerator work?
• Can there be an event horizon inside neutron stars?
• Do gravitational waves play a role in the expansion of space?

Do tattoos protect the skin from sun damage? Posted: 26 Feb 2016 03:39 PM PST submitted by /u/YourFinestPotions [link] [comments]

Is There a 100% Reflective Surface? Posted: 26 Feb 2016 06:27 PM PST Mirrors don't reflect 100% light. Is there any surface that does? I think it'd be impossible for such a thing to exist though. Prove me wrong! (or not) submitted by /u/Wahw11 [link] [comments]

If the atmosphere was twice as dense, would fluctuations in weather be more or less severe? Posted: 26 Feb 2016 06:49 PM PST All other things (including gas composition) being equal, how would a denser atmosphere affect the weather and climate? submitted by /u/superhelical [link] [comments]

What exactly is a photon? Posted: 26 Feb 2016 07:22 PM PST I'm a bit embarrassed to ask this question. I sort of know what photons do but not exactly what they are. Where do they come from? How are they created and what particles are they made up of? submitted by /u/Sir_Doobenheim [link] [comments]

How is negative nuclear binding energy (BE/A) possible? Posted: 26 Feb 2016 08:10 PM PST I was browsing the Table of Nuclides and I noticed that a select few nuclei, mostly extremely unstable ones like Lithium-3 and Boron-6, had a negative BE/A. From what I understand, this shouldn't be possible. Binding energy is the mass/energy lost when nucleons bind together in a nucleus - how can this value be negative? Wouldn't that mean that the nucleus actually has more energy than the separate particles? submitted by /u/TristanBomb [link] [comments]

Can an object become a black hole by moving fast enough? Posted: 27 Feb 2016 03:25 AM PST this week in school we have been learning about special relativity and we learnt that an objects mass increases as its speed approaches c. Does this mean there would be a point where its mass is large enough that it could become a black hole? submitted by /u/wickedel99 [link] [comments]

What's so special about Earth's axial tilt of 21° 1/2 degrees? Posted: 26 Feb 2016 06:33 PM PST I understand that Earth's tilt of 21° 1/2 influences a lot the dynamic of seasons around the whole globe. But... How different would it if it was a smaller angle? What about a wider angle? submitted by /u/Botycho [link] [comments]

When I eat seafood or other things cooked whole (lobsters, octopus, crabs), why can't I identify any organs? Posted: 26 Feb 2016 01:33 PM PST submitted by /u/quyksilver [link] [comments]

Where do courtship rituals among birds come from and more specifically how are they passed along from generation to generation? Posted: 26 Feb 2016 10:19 PM PST For example, I recently read that before copulation a male Kingfisher presents a fish head-first to the female, so that she can swallow it without choking on the fins and scales. Also, courtship feeding among Hawfinches is at times totally ritualised, so that although their bills meet, no food passes between them. Other examples include Flamingos who, when choosing a mate, dance in a big group. They stretch their necks and flip their heads back and forth while taking tiny, mincing steps or the series of vigorous chases that begin when a female wren entices a male. Clearly "nature" cannot account wholly for this. Thus, my question is, how do these rituals develop and how are the intricacies of these such rituals passed on from generation to generation? submitted by /u/tulgey_wood [link] [comments]

Would it be possible to build a large double slit experiment to examine the behavior of gravitational waves? If so, would that be proof that gravitons exist? Posted: 27 Feb 2016 04:43 AM PST submitted by /u/metaobject [link] [comments]

How were the ancestors of modern birds able to survive the mass extinctions that killed off the dinosaurs? Posted: 26 Feb 2016 03:23 PM PST I know very little about the subject other than I kind of remember that the first sort of mammalian creatures were often able to survive by burrowing underground and/or having fur that kept them warm during the ice age. Is there any truth to this? How did birds survive? submitted by /u/I_fuckedaboynamedSue [link] [comments]

How far back do infectious diseases go in prehistory? Posted: 26 Feb 2016 09:20 PM PST Not as in, prehistoric human history. What I mean is, how far back do diseases like influenza go? Did dinosaurs have something similar to bird flu, for example? Were multicellular creatures always being attacked by diseases? submitted by /u/chutche2 [link] [comments]

Why is magnetic inequivalence not a problem in 13C NMR? Posted: 27 Feb 2016 04:03 AM PST In 1H NMR I've been told coupling to magnetically inequivalent carbons isnt considered due to carbons low RA, but why is it not an issue to consider in 13C spectra? submitted by /u/thatsnotmyname95 [link] [comments]

Why do molecules tend towards lower potential energy? Posted: 27 Feb 2016 01:30 AM PST The whole reason chemicals react is to be at a lower state of potential energy. Why is it this way? What's so special about having less potential energy? submitted by /u/sponges789 [link] [comments]

How large does a piece of land have to be before it is no longer considered an island? Posted: 26 Feb 2016 01:00 PM PST Aren't all of the continents just huge islands? Where is the cutoff? submitted by /u/ethansings [link] [comments]

Why is iron-oxide considered a ceramic and not a metal? Posted: 27 Feb 2016 03:22 AM PST Is it because of its mechanical/physical properties? Or is there something else that "makes" it a ceramic? Thanks in advance! submitted by /u/Niggi888 [link] [comments]

How Doesn't Earth Get Pulled Into The Sun? Posted: 26 Feb 2016 07:03 PM PST Now, I did search for the answer to this question. I got it. There are some things I still don't understand though: -How come the earth get into such a perfect stabilization? -Is it really this much stable? -Assuming there IS some air in space, doesn't the earth get slowed down very slowly? (With very slowly I mean INSANELY slowly) submitted by /u/Wahw11 [link] [comments]

Do some people heal faster than others? Bones, cuts, etc.. Assuming the same treatment of injury? Posted: 26 Feb 2016 03:42 PM PST submitted by /u/2bad2care [link] [comments]

What are selectable markers? My book has confused me. How are they used to identify among recombinants|non-recombinants and transformants|non-transformants? Posted: 27 Feb 2016 12:15 AM PST submitted by /u/itsherbirthday [link] [comments]

What happens if a quark falls into an event horizon? Posted: 26 Feb 2016 12:25 PM PST To clarify the question, if one pulls apart two quarks they form two more as quarks never go solo. (As far as I know, of course) What would happen if, when pulling two quarks apart but before more quarks are formed, one of them fell into the event horizon of a black hole? submitted by /u/Forricide [link] [comments]

Why does the launch of a geostationary satellite have a launch window? Posted: 26 Feb 2016 12:32 PM PST While watching the scrubbed SES-9 launch the other night this occurred to me. If the ultimate position of the craft is relative to the launch site why would there be time restrictions of the launch? submitted by /u/kevpluck [link] [comments]

How does the Einstein-Szilard refrigerator work? Posted: 26 Feb 2016 01:05 PM PST Can someone please explain the cooling cycle of the Einstein-Szilard refrigerator? From this diagram, I understand that heat is applied to chamber 29 (the generator), but I quickly lose the thread of which gasses or liquids are forced where, and which phase changes happen where, and whether those phase changes are used to absorb/release heat, or to generate the pressures that operate the system. submitted by /u/cnash [link] [comments]

Can there be an event horizon inside neutron stars? Posted: 27 Feb 2016 03:48 AM PST Is there even that huge of a difference between blackholes and neutron stars? Aren't black holes just really dense neutron stars where the event horizon is larger than the star? submitted by /u/Neotheo [link] [comments]

Do gravitational waves play a role in the expansion of space? Posted: 26 Feb 2016 03:35 PM PST With all the recent hoopla over the detection of gravitational waves, along with countless visuals of the curvature of space-time, my poor lil human brain got to thinkin. I want to know what effect (if any) gravitational waves and the subsequent curvature of space-time have on the overall size of our ever expanding universe. I picked up a quote from this article: "Currently, we believe [the driving force behind the expansion of the universe is] mostly momentum left over from the Big Bang, and the force of dark energy will be accelerating this expansion. Forever." This would suggest that gravity and the mass of objects play no role, but I can't help but think that they do, and I look forward to someone more well-learned than I explaining why I'm wrong! For this thought experiment I imagine space to be a sheet of plastic wrap. A massive object comes along and sits in the center of the sheet, leaving an indentation. Due to dark energy, (or maybe just the propensity of the universe to flatten? Is that a thing?) the indentation is forced back to it's original state, pushing the space around it out in all directions. Just like if you were to pull an indentation out of plastic wrap! Thanks for swiftly pointing out the flaws in my logic! I look forward to your responses! :D submitted by /u/flat_earth_fucktard [link] [comments]

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AskScience AMA Series: I’m Dyann Wirth, Chair of the Department of Immunology and Infectious Diseases at Harvard T.H Chan School of Public Health and Director of the Harvard Malaria Initiative, and I’m here to talk about malaria eradication; Ask Me Anything!

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• AskScience AMA Series: I’m Dyann Wirth, Chair of the Department of Immunology and Infectious Diseases at Harvard T.H Chan School of Public Health and Director of the Harvard Malaria Initiative, and I’m here to talk about malaria eradication; Ask Me Anything!
• What's the deepest ocean we've ever discovered in space?
• Do any modern humans carry mitochondrial DNA or Y chromosomes from Neanderthals or Denisovans?
• Why does the half life of a substance decrease as concentration decreases in zeroth order reactions and second order reactions but not first order reactions?
• If I were the size of an atom, how long would it take to walk across the tip of a sewing needle?
• Is there any reason why the experiment that detected gravitational waves is so remarkably similar to the Michelson-Morley experiment?
• If FSH begins sperm production, and sperm constantly replenishes itself, when would be an acceptable reason for the sertoli cells to secrete inhibin to inhibit FSH secretion?
• Can the human body feel a change in acceleration while in a highly elliptical orbit in space?
• What is the chromosomal nomenclature? Example, what does this mean '6p23'?
• Is the air coming out of the towers in coal power plants just water vapor? If so, where are the CO2 and other pollutants released?
• What would the atmospheric composition have to be to scatter red light instead of blue? Green Light? Purple?
• Is micro clustered water bogus?
• Is it possible for something to have negative mass?
• Since LIGO has detected gravitational waves, does that mean gravitons cannot exist?
• Can you drown in a very thick fog?
• How big would a star have to be to create a 30-40 trillion solar mass black hole?
• "The black-hole candidate binary X-ray source GRS 1915+105[47] appears to have an angular momentum near the maximum allowed value" What!? Why?
• Dissolving egg white in a buffer?
• How would I distribute points on a sine wave so the length between them are equal?
• Can neural activity affect other brain regions without travelling through grey/white matter?
• How long would I need to eat a vegetarian diet before it would be safe to say that I was no longer "made of" meat?
• Does free space have a Poisson ratio?
• We describe space as "the fabric of space-time". To me this seems like it implies space as a 2-D thing. How can this fabric exist in our 3-D universe? Or maybe, I am just understanding it wrong.
• Is the methylation of inorganic Hg into methylmercury what makes it so lipophilic and cause it to bioaccumulate?

AskScience AMA Series: I’m Dyann Wirth, Chair of the Department of Immunology and Infectious Diseases at Harvard T.H Chan School of Public Health and Director of the Harvard Malaria Initiative, and I’m here to talk about malaria eradication; Ask Me Anything! Posted: 26 Feb 2016 04:35 AM PST Hello, reddit! I'm Dyann Wirth, Chair of the Department of Immunology and Infectious Diseases at Harvard T.H Chan School of Public Health and Director of the Harvard Malaria Initiative. I also serve on the board of the University-wide Defeating Malaria: From the Genes to the Globe initiative. Malaria's impact across the globe is vast: Nearly half of the world's population—about 3.2 billion people—is at risk of malaria. And an estimated 283 million people are infected every year—most of them young children in impoverished Sub-Saharan Africa. Recently, President Obama pledged to wipe out malaria. I told the New York Times that we currently don't have the "arsenal" to eradicate malaria today, but it's a goal that we're working towards. My lab's research has provided new insight into how the malaria parasite has evolved, allowing us to better understand the fundamental biology of the parasite and the mechanisms of drug resistance. Our team at the Harvard Malaria Initiative employs sophisticated laboratory approaches to understand the underlying causes of drug resistance identify and screen potential new drugs and drug targets, rapidly translate new findings into practical treatments, and train researchers and global public health professionals from the U.S. and malaria endemic regions. I'll be here from 1:00 to 3:00 p.m. ET to answer your questions about malaria; Ask Me Anything! submitted by /u/HarvardChanSPH [link] [comments]

What's the deepest ocean we've ever discovered in space? Posted: 26 Feb 2016 05:53 AM PST I've been doing some research, but the little I've found is related to a huge quasar in space. What I'm interested in is more specifically the deepest 'ocean' we've ever seen in space? What would it be like, and how would it act? How would water at the bottom of this ocean act like? submitted by /u/Tall_Fox [link] [comments]

Do any modern humans carry mitochondrial DNA or Y chromosomes from Neanderthals or Denisovans? Posted: 25 Feb 2016 06:00 AM PST If not, is there any significance to that? I can see how it is possible to lose both- the female offspring of a sapiens mother and neanderthal father would have 50% neanderthal DNA but no neanderthal mithochondria or Y chromosome. I'm just having a bit of trouble understanding how probable it would be that both of those would be lost entirely, based on the fact that 1-4% of modern Eurasian or Melanesian DNA comes from those hominids. submitted by /u/GreenStrong [link] [comments]

Why does the half life of a substance decrease as concentration decreases in zeroth order reactions and second order reactions but not first order reactions? Posted: 26 Feb 2016 03:57 AM PST I know that radioactive dating uses reactions which are first order as they maintain a constant half-life independent of concentration. I know that the half-life of second and zeroth order reactions varies the time decreases, but why is this? submitted by /u/Iveseenthestars [link] [comments]

If I were the size of an atom, how long would it take to walk across the tip of a sewing needle? Posted: 25 Feb 2016 12:13 PM PST submitted by /u/BustedLung [link] [comments]

Is there any reason why the experiment that detected gravitational waves is so remarkably similar to the Michelson-Morley experiment? Posted: 25 Feb 2016 06:16 PM PST I was just watching the Colbert clip on gravitational waves, and noticed that the setup of the experiment is pretty much exactly the same to the Michelson-Morley experiment that was designed to detect the "aether wind". My thoughts are that the idea of a gravitational field and the aether are very similar models, so the experiment to detect one might be similar to the other - but i'm sure that there's a better reason to explain these similarities submitted by /u/rend0ggy [link] [comments]

If FSH begins sperm production, and sperm constantly replenishes itself, when would be an acceptable reason for the sertoli cells to secrete inhibin to inhibit FSH secretion? Posted: 25 Feb 2016 06:24 AM PST I just don't understand why the body would want to stop the production of sperm. Or are there other functions of FSH? submitted by /u/chucklemcfartsparkle [link] [comments]

Can the human body feel a change in acceleration while in a highly elliptical orbit in space? Posted: 25 Feb 2016 09:09 PM PST If you are in a highly elliptical orbit, will a human body sense a change in acceleration while in a craft that is accelerating rapidly then slowing as it rounds the planetary body? submitted by /u/Mourn4U [link] [comments]

What is the chromosomal nomenclature? Example, what does this mean '6p23'? Posted: 26 Feb 2016 04:22 AM PST submitted by /u/itsherbirthday [link] [comments]

Is the air coming out of the towers in coal power plants just water vapor? If so, where are the CO2 and other pollutants released? Posted: 25 Feb 2016 03:58 PM PST I'm originally from a small town whose economy is built on coal mining. Some people in the town say that the towers in a power plant are just releasing water vapor, not any pollution. Is this true? Or is it just a false statement used to support the continuation of the burning of coal? I tried searching on the internet, but I could not find an answer addressing this specifically. I understand that coal fired power plants do release a large amount of CO2 that greatly contributes to global warming, I'm just not sure exactly how and where it is released. submitted by /u/cogneuro [link] [comments]

What would the atmospheric composition have to be to scatter red light instead of blue? Green Light? Purple? Posted: 25 Feb 2016 05:51 AM PST submitted by /u/amooseatemydad [link] [comments]

Is micro clustered water bogus? Posted: 25 Feb 2016 08:45 AM PST Saw something new in my fridge called clusterx2 - label says something about water clusters that hydrate you better. Quick online research said that the "science" behind this is that micro clusters of water get absorbed better than tap water (that comes in bigger molecule clusters apparently?). Can't seem to find a reliable source either way though - so does anyone know more about this stuff? submitted by /u/backgen [link] [comments]

Is it possible for something to have negative mass? Posted: 25 Feb 2016 09:54 AM PST Is there anything in the universe that has properties opposite of gravity resulting from having the opposite of mass? submitted by /u/Lil_Oly17 [link] [comments]

Since LIGO has detected gravitational waves, does that mean gravitons cannot exist? Posted: 25 Feb 2016 11:22 AM PST If Einstein's theory of relativity has been confirmed by LIGO, (or at least part of it) that gravity is the result of mass pulling down on space itself forming a gravity well and mass can produce waves in the "fabric" of space. Then does that mean the theory that gravity is caused by the exchange of gravitons between mass is dead? Or can gravitons still exist, but make up a different part of gravity? submitted by /u/reactor_core [link] [comments]

Can you drown in a very thick fog? Posted: 25 Feb 2016 05:08 AM PST submitted by /u/RomanticApplePie [link] [comments]

How big would a star have to be to create a 30-40 trillion solar mass black hole? Posted: 25 Feb 2016 07:05 AM PST I just saw a video that shows the scaled size of certain black holes and how they are created. One relatively small black hole was made by condensing the sun to the size of Manhattan. Another was made by condensing the earth down to the size of a circus peanut. Here's my question....if the largest black holes are anywhere from 30 to 40 trillion solar masses....how big was the original star that created it? Would it have to be something unfathomably huge... like a trillion light years across? (Clearly that's possibly a terrible exaggeration but you get my point...HUGE) submitted by /u/wonderboy_6 [link] [comments]

"The black-hole candidate binary X-ray source GRS 1915+105[47] appears to have an angular momentum near the maximum allowed value" What!? Why? Posted: 25 Feb 2016 08:59 AM PST The Wikipedia on black holes article just casually mentions this, with the citation (not for the claim but for the black hole that it describes) is too dense for me to parse with any efficiency. It's such a remarkable thing to just 'say'. Angular momentum has an upper limit? What the hell is it? Why can't things have greater angular momentum? What would happen if they did?? You can't just SAY stuff like that without more explanation, Wikipedia! submitted by /u/ndufour [link] [comments]

Dissolving egg white in a buffer? Posted: 25 Feb 2016 07:13 AM PST I am trying to dissolve egg white for fouling studies in microfiltration. I have tried to dissolve ew in Glycine-NaOH buffer but I cant get the protein concentration which is around 11%. Please suggest a method for dissoving ew and determining protein submitted by /u/totso [link] [comments]

How would I distribute points on a sine wave so the length between them are equal? Posted: 25 Feb 2016 01:36 PM PST Illustrated: http://i.imgur.com/SYYXI81.png I'm writing a program where I have points evenly distributed on a line. I want the line to curve, but I still want the points to be evenly distributed. If the line is curved like a sine wave, is there an efficient way to calculate a new position x_new, y_new from x_old, so that all such points have an equal distance to both of its neighbors (excluding the end points)? See the illustration for more details. Also, is there a general way to do this efficiently with curves apart from sine waves? submitted by /u/Mytino [link] [comments]

Can neural activity affect other brain regions without travelling through grey/white matter? Posted: 25 Feb 2016 01:23 PM PST For example, we can pick up ERPs/oscillations etc using MEG and EEG. Would electrical activity be able to travel through the cerebral spinal fluid and affect other regions? i.e. two adjacent gryi. submitted by /u/ProceduralCerebral [link] [comments]

How long would I need to eat a vegetarian diet before it would be safe to say that I was no longer "made of" meat? Posted: 25 Feb 2016 07:10 PM PST I suppose this question could be generalized into something like: How long does it take for all the cells in my body to be replaced? Not sure if the "meat" part of it would affect it at all. I have just started my new diet, and it got my brain turning. submitted by /u/CatoftheCana1s [link] [comments]

Does free space have a Poisson ratio? Posted: 25 Feb 2016 10:56 AM PST I've been wondering since reading about the discovery of gravitational waves and how they 'compress and stretch' the earth. Does the compression of space-time along some axis correspond to an expansion about others? And like the title says, is there a Poisson ratio for space-time or free space? submitted by /u/anoetherfeynmanfan [link] [comments]

We describe space as "the fabric of space-time". To me this seems like it implies space as a 2-D thing. How can this fabric exist in our 3-D universe? Or maybe, I am just understanding it wrong. Posted: 25 Feb 2016 10:04 PM PST Also, regarding gravitational waves, if we were close to the source of one, would we be be able to actually feel it? Thank you! submitted by /u/Whhyyy123 [link] [comments]

Is the methylation of inorganic Hg into methylmercury what makes it so lipophilic and cause it to bioaccumulate? Posted: 25 Feb 2016 11:16 AM PST I keep reading in my ecotoxicology textbook that the point of Phase II reactions are to conjugate contaminants to molecular structures that increase their hydrophilicity, making them "very polar" and more easily eliminated. One of these conjugations is methylation. However I can't figure out how this applies to inorganic mercury. If methylating inorganic mercury results in methylmercury, which is very lipid soluble, how does that jive with it being a phase II metabolism product? submitted by /u/wtox1234 [link] [comments]

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The air outside is cool, the air inside is warm. Room has two windows. I want to put a fan on one of them to cool down the room. Is it more effective to place it pointing outwards (to suck the hot air out) or inwards (to suck the cool air in)?

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• The air outside is cool, the air inside is warm. Room has two windows. I want to put a fan on one of them to cool down the room. Is it more effective to place it pointing outwards (to suck the hot air out) or inwards (to suck the cool air in)?
• There are waves associated with the electromagnetic and now gravitational forces. Are there similar waves for the strong and weak nuclear forces?
• Is it possible to trap light in a hollow ball whose inside is made out of mirror?
• How do you measure buoyancy and compare the buoyancy of two different liquids?
• How many states of matter are there (beyond the 4 common ones and more exotic ones)?
• Why is the radius of potassium and fluoride ions close, but the radius of the potassium and fluorine atoms so different?
• Why do clouds have flat bottoms? Why do they seem to just stop?
• Is there a succinct unit name for liters per meter squared per hour?
• Do moving masses leave a wake of gravitational waves behind them?
• Can a photon move in a straight line ?
• Could a laser be made from sound as it is from light?
• Two parts: Does distance, in any way, affect relative time dilation? And, how do objects remain stable if all their parts are experiencing time at different speeds relative to each other?
• Why do certain cookies like Oreos get softer instead of stale when you leave them out?
• What do the numbers and letter "452B" signify in the recently discovered planet Kebler 452B?
• When I bashed my head as a child I cried; as an adult I get angry and swear. When did the change occur and why?
• Does turning a gyroscope against it's spin axis cause the gyroscope to slow down?
• What are the advantages of numeric integration (compared to integrating by finding the primitive function) ?
• Is is possible for the brain to become self aware?
• Will Speaker work with less mAh?
• Can animals feign injury?
• The Zika virus can be transmitted through mosquitoes, so why can't AIDS?

The air outside is cool, the air inside is warm. Room has two windows. I want to put a fan on one of them to cool down the room. Is it more effective to place it pointing outwards (to suck the hot air out) or inwards (to suck the cool air in)? Posted: 24 Feb 2016 05:49 PM PST Edit: I'm glad this has sparked so many interesting discussions. I'll add more details: The windows are on opposite walls and they both connect to the outside. It's evening, so the sun is not a factor. I'm on a first floor, not at ground level. submitted by /u/Funeralord [link] [comments]

There are waves associated with the electromagnetic and now gravitational forces. Are there similar waves for the strong and weak nuclear forces? Posted: 25 Feb 2016 02:05 AM PST submitted by /u/RIP_Jazxkzha [link] [comments]

Is it possible to trap light in a hollow ball whose inside is made out of mirror? Posted: 25 Feb 2016 06:24 AM PST Say you have a ball which can be opened. Inside the ball is purely mirror. You put a flashlight that is turned on inside and you close the lid for a million years. The flashlight will have run out of battery long before then. Within the ball, will the light just keep bouncing forever? Now after a million years, someone or something opens that ball with an internal mirror. Will a flash of light occur when the ball is opened? submitted by /u/BananaBladeOfDoom [link] [comments]

How do you measure buoyancy and compare the buoyancy of two different liquids? Posted: 24 Feb 2016 08:52 PM PST I'm helping write a guide on flotation tanks (sensory deprivation tanks) and we're comparing the relative buoyancy of the float tank solution to that of ocean salt water. We have the hydrometer readings for both of these liquids. What I'd like to know is if the following statement is true: "With pure water holding a specific gravity of exactly 1, the ocean comes in at about 1.025. Float tanks usually sit in the 1.27 - 1.3 range, making them up to 12 times more buoyant than ocean water." If not, what would be the accurate statement. Thank you for helping me with this. Archimedes principle is very confusing. submitted by /u/JTSnidely [link] [comments]

How many states of matter are there (beyond the 4 common ones and more exotic ones)? Posted: 24 Feb 2016 09:46 PM PST So this isn't my field of study, I'm a geneticist and bioinformatician, but I've pondered it for awhile and never found a conclusive answer. How many states of matter are there? Beyond things like solid, liquid, gas, plasma? I know things like Bose-Einstein Condensates are, but not sure where the dividing line exists. Are there weird quirks in metallic phases that would be different from a straight solid? I recall reading somewhere it was 8 or 9 but others (and the wiki I link to below) say it's more. Is there a realistic answer or is that dependent on how you define what a state/phase of matter is? As an aside I did read this wiki article: https://en.wikipedia.org/wiki/State_of_matter and some of the associated references. I didn't find a clear answer and ended up in a wiki/google rabbit-hole. submitted by /u/blerghington [link] [comments]

Why is the radius of potassium and fluoride ions close, but the radius of the potassium and fluorine atoms so different? Posted: 24 Feb 2016 03:34 PM PST 1.33 Å Fluoride 1.38 Å Potassium ion Fluorine atom 42 pm Potassium atom 243 pm submitted by /u/Magister_Ludi [link] [comments]

Why do clouds have flat bottoms? Why do they seem to just stop? Posted: 24 Feb 2016 06:04 PM PST When I look at clouds, cumulus to be exact, I notice that at the bottom, they appear to be flat. I just want to know why that is. I assumed that it had to do with the atmosphere but Im not sure. submitted by /u/zack_hill_ [link] [comments]

Is there a succinct unit name for liters per meter squared per hour? Posted: 24 Feb 2016 05:51 PM PST Question above. The hypothetical situation would be in relation to absorption / dispersion of fluids. Example how much one individual sweats out of a particular area of their body. submitted by /u/TF_Sally [link] [comments]

Do moving masses leave a wake of gravitational waves behind them? Posted: 24 Feb 2016 02:46 PM PST If you were on a planet, and that planet was the only thing of mass in the universe, could you tell if you were moving by looking for a wake of gravitational ripples behind the planet, like the wake of a ship? Maybe this would only be noticeable if the planet were moving at a significant percentage the speed of light, or if the planet were accelerating or decelerating submitted by /u/mo9722 [link] [comments]

Can a photon move in a straight line ? Posted: 24 Feb 2016 11:59 AM PST Something like 0 Hz frequency ? submitted by /u/imado98 [link] [comments]

Could a laser be made from sound as it is from light? Posted: 24 Feb 2016 10:03 AM PST Civilizations from other times and places used sound to move heavy objects, bore tunnels and power engines, according to the Seth Materials. If this were true, could we do this in our civilization? I'm guessing that to start we'd have to control and amplify the sound energy. So, my question: Could a laser be made from sound? submitted by /u/bigDoug1234 [link] [comments]

Two parts: Does distance, in any way, affect relative time dilation? And, how do objects remain stable if all their parts are experiencing time at different speeds relative to each other? Posted: 24 Feb 2016 09:03 AM PST As an object's speed approaches the speed of light it will advance through time more slowly, relative to myself (a stationary observer in this hypothetical). Does distance in any way impact this? For example, if I was to spin an object in a 6 inch orbit around my hand at close to the speed of light, would it experience the same time dilation as if I had sent it to Neptune and back at the same speed, presuming both examples travel for the same period of time relative to myself? Now, I know the answer will be yes, but here's the bit that stumps me. All particles/atoms/little tiny bits of stuff are vibrating and bouncing around and bumping against each other to create solids and liquids and gasses etc. presumably all at very high speeds. Why does this movement not create relativistic time dilation within every object and form of matter? Or even within plants, animals and ourselves? Why is anything ever stable if everything is always moving at different speeds relative not only to separate things around it, but also to each of its own individual parts? Am I completely missing a simple explanation or am I stumbling into quantum physics or some other concept above my education level? Or is the difference just negligible and it all works because the speeds are no where near fast enough? submitted by /u/MyUsernameIsRedacted [link] [comments]

Why do certain cookies like Oreos get softer instead of stale when you leave them out? Posted: 24 Feb 2016 05:38 PM PST Extensive home studies also show Kebler EL Fudge also share this trait. submitted by /u/flaming_applesauce [link] [comments]

What do the numbers and letter "452B" signify in the recently discovered planet Kebler 452B? Posted: 24 Feb 2016 11:18 AM PST submitted by /u/filmbruh [link] [comments]

When I bashed my head as a child I cried; as an adult I get angry and swear. When did the change occur and why? Posted: 24 Feb 2016 05:24 AM PST Bashing my head still really hurts, as do other injuries. But as a child I would burst into inconsolable tears now I stamp my feat, shout "fuck" and I'm moody for a little while. Has my perception of pain changed? submitted by /u/GrinningManiac [link] [comments]

Does turning a gyroscope against it's spin axis cause the gyroscope to slow down? Posted: 24 Feb 2016 01:25 PM PST I have a question about some properties of conservation of angular momentum. Take this diagram for a reference of terms. I am wondering what happens when a spinning disk is forced to turn about it's input or output axis. Clearly this provides resistance, but will the disk slow down in the process? Is the energy required to spin the disk equal to the energy it would provide in resistance? submitted by /u/dicvt [link] [comments]

What are the advantages of numeric integration (compared to integrating by finding the primitive function) ? Posted: 24 Feb 2016 09:38 AM PST submitted by /u/The_Godlike_Zeus [link] [comments]

Is is possible for the brain to become self aware? Posted: 24 Feb 2016 03:47 PM PST Could the brain become self aware in the sense that it knows what it is? I don't mean you being self aware in your brain, but your brain becoming aware of itself in you. submitted by /u/labiokses [link] [comments]

Will Speaker work with less mAh? Posted: 24 Feb 2016 05:56 PM PST So long story short, I am in Australia and I am from the US and I have not found a proper adapter for my iHome. If the iHome needs 7.5V and 1800mAh would it be ok to use an adapter that would give it 7.5V and 1000mAh? submitted by /u/sidthekid11 [link] [comments]

Can animals feign injury? Posted: 24 Feb 2016 12:31 PM PST Is there any evidence of animals feigning injury to gain attention/resources from humans? We have cats, now and then they will brush around our legs while we're preparing food and inevitably sometimes their paws will accidentally be stood on. Feeling guilty, we'll give them a treat as an apology for hurting them. Assuming this happened many times, could an animal become conditioned to put itself at risk of small injury from humans to gain a reward? Or more extremely, finding that they are rewarded when injured, outright feign injury in search of reward? submitted by /u/ceogorman [link] [comments]

The Zika virus can be transmitted through mosquitoes, so why can't AIDS? Posted: 24 Feb 2016 05:25 PM PST submitted by /u/mushroomtips318 [link] [comments]

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