Symmetry of a snowflake through an electron microscope shows both sharp and round edges. Do we understand the causal factors as to why this occurs?

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• Symmetry of a snowflake through an electron microscope shows both sharp and round edges. Do we understand the causal factors as to why this occurs?
• How accurate must the time of launch be for spacecraft on a slingshot path?
• Discussion: MinuteEarth's newest YouTube video on reindeer Meat!
• I often hear about psychological experiments in the past, such as Milligrams, Stanford Prison that could not be done or even replicated today because of informed consent rules. Although obviously informed consent rules are more humane, do they harm psychology as a science?
• Parrots and other bird mimics can seemingly imitate any sound. Are there any sounds that would be physically impossible for a bird to make?
• How did chemists know the specific molecular makeup of chemicals, as well as the specific molecular changes taking place in the reactions they worked with in the 19th and early 20th centuries?
• Does frequent exposure to the smell of food or drinks affect our sense of taste?
• (Astronomy) If the sun will eventually turn into a red dwarf and expand, will the orbits of the planets change?
• How do houseplants 'know' it's winter, given that I have lights and heating on most of the time?
• Why does a piece of cloth act as such a good filter against odors and aromas and gases? Wouldn't the airborn molecules easily pass through the pores?
• Say a man have a 600,000 km long stick. What would happen if the man give a push to the stick other end of the stick? Will the motion immediately arrive at the other end of the stick?
• How are packing problems solved? Since they are a sort of optimization problem, can optimal solutions be found by hand using calculus?
• The reflex arc misses out the brain, the spinal cord 'deals' with the response by sending a signal back to the effector. By that logic, can quadriplegic people respond to a stimulus, say for example a needle stabbed into their hand, if aforementioned quadriplegic had a clean break at their neck?
• Is it true that all of the Iron in the Unieverse is produced only via nuclear fusion in stars?
• Did complex eyes evolve once or multiple times from simple eyes or vice versa? Or did they both evolve from a simpler type of eye?
• Is there a ATP/ADP Recycle Limit?
• Why is the Western side of the US so hot and arid compared to the East?
• We have organizations that look for intelligent life, but are there any major projects with the aim to make our presence known?

Symmetry of a snowflake through an electron microscope shows both sharp and round edges. Do we understand the causal factors as to why this occurs? Posted: 19 Dec 2016 04:50 PM PST Just came across this pic. Stunning symmetry. submitted by /u/ZipZowie [link] [comments]

How accurate must the time of launch be for spacecraft on a slingshot path? Posted: 20 Dec 2016 05:08 AM PST Since these missions rely on the position of planets in space, what kind of margin of error are we talking about for the time of launch? Would a few hours delay screw the whole thing up? submitted by /u/the_jumping_brain [link] [comments]

Discussion: MinuteEarth's newest YouTube video on reindeer Meat! Posted: 19 Dec 2016 09:09 AM PST Reindeer meat could've entered North American cuisine and culture, but our turn of the century efforts to develop a reindeer industry were stymied by nature, the beef lobby, and the Great Depression. Check out MinuteEarth's new video on the topic to learn more! We're joined in this thread by David (/u/goldenbergdavid) from MinuteEarth, as well as Alex Reich (/u/reichale). Alex has an MS in Natural Resources Science & Management from the University of Minnesota, and has spent time with reindeer herders in Scandinavia and Russia, with caribou hunters in Greenland and Canada, and with many a Rangifer-related paper on his computer. submitted by /u/AskScienceModerator [link] [comments]

I often hear about psychological experiments in the past, such as Milligrams, Stanford Prison that could not be done or even replicated today because of informed consent rules. Although obviously informed consent rules are more humane, do they harm psychology as a science? Posted: 20 Dec 2016 04:47 AM PST I was thinking of jury studies, where there is a huge difference between "Do you sentence this man to death" and "Would you sentence this man to death". I discussed this with a psychologist friend who insisted that this is somehow compensated for, but I am skeptical and think perhaps he drank the kool-aid. How do you test whether or not ICBM crews are going to actually launch without actually putting them in that position? submitted by /u/GenericUsemame [link] [comments]

Parrots and other bird mimics can seemingly imitate any sound. Are there any sounds that would be physically impossible for a bird to make? Posted: 19 Dec 2016 04:45 PM PST submitted by /u/GreyhoundZero1 [link] [comments]

How did chemists know the specific molecular makeup of chemicals, as well as the specific molecular changes taking place in the reactions they worked with in the 19th and early 20th centuries? Posted: 19 Dec 2016 11:34 PM PST submitted by /u/MCsmalldick12 [link] [comments]

Does frequent exposure to the smell of food or drinks affect our sense of taste? Posted: 19 Dec 2016 04:08 PM PST submitted by /u/RelaxRelapse [link] [comments]

(Astronomy) If the sun will eventually turn into a red dwarf and expand, will the orbits of the planets change? Posted: 19 Dec 2016 03:28 PM PST submitted by /u/HighDefFish [link] [comments]

How do houseplants 'know' it's winter, given that I have lights and heating on most of the time? Posted: 19 Dec 2016 10:46 AM PST A lot of advice for house plants suggests watering them less over winter, because their growth is reduced. But how do they detect triggers such as shortening day length and lower temperatures in such an artificial environment? submitted by /u/SSANNEarchy [link] [comments]

Why does a piece of cloth act as such a good filter against odors and aromas and gases? Wouldn't the airborn molecules easily pass through the pores? Posted: 19 Dec 2016 11:20 PM PST Title says it all submitted by /u/gamer_alien [link] [comments]

Say a man have a 600,000 km long stick. What would happen if the man give a push to the stick other end of the stick? Will the motion immediately arrive at the other end of the stick? Posted: 20 Dec 2016 02:45 AM PST submitted by /u/KulitKentang [link] [comments]

How are packing problems solved? Since they are a sort of optimization problem, can optimal solutions be found by hand using calculus? Posted: 19 Dec 2016 04:56 PM PST I want to write a paper on packing for school. Let's say I have a square. This square is 9 units by 9 units for a total area of 81u2 . I have rectangles, each with an area of 10 u2 that I want to pack into the box. How do I go about maximizing the number of these rectangles I can fit into the box? I know that the answer is 8, but how could I arrive at this conclusion with calculus? Can I write out an optimal solution using rectangles of specific dimensions? Alternatively, if someone could suggest some sort of packing problem solution generator program (preferably with an image output to display the packing) I could examine that would also be nice! submitted by /u/Niggardly_Elucidator [link] [comments]

The reflex arc misses out the brain, the spinal cord 'deals' with the response by sending a signal back to the effector. By that logic, can quadriplegic people respond to a stimulus, say for example a needle stabbed into their hand, if aforementioned quadriplegic had a clean break at their neck? Posted: 19 Dec 2016 04:20 PM PST submitted by /u/Pricer_69 [link] [comments]

Is it true that all of the Iron in the Unieverse is produced only via nuclear fusion in stars? Posted: 20 Dec 2016 12:58 AM PST I've read this statement that every single atom Iron is produced in the stars (including the iron in our blood and body.) and was curious if it is true. submitted by /u/ogitocherpi [link] [comments]

Did complex eyes evolve once or multiple times from simple eyes or vice versa? Or did they both evolve from a simpler type of eye? Posted: 19 Dec 2016 04:32 PM PST EDIT: compound! not complex submitted by /u/willbell [link] [comments]

Is there a ATP/ADP Recycle Limit? Posted: 19 Dec 2016 01:26 PM PST ATP becomes ADP after hydrolysis which in turn becomes ATP again through the oxidation of glucose. How many times can this cycle be repeated for one molecule before a new molecule must be created? Can this process be repeated indefinitely for one molecule? submitted by /u/grindsman [link] [comments]

Why is the Western side of the US so hot and arid compared to the East? Posted: 19 Dec 2016 04:12 PM PST submitted by /u/LizhardSquad [link] [comments]

We have organizations that look for intelligent life, but are there any major projects with the aim to make our presence known? Posted: 19 Dec 2016 04:50 PM PST submitted by /u/FTLSquid [link] [comments]

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[Astronomy] Do we know enough about the heavy metal output of supernovae to speculate as to what the mass of the first generation of stars was? What do we know about the first stars?

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• [Astronomy] Do we know enough about the heavy metal output of supernovae to speculate as to what the mass of the first generation of stars was? What do we know about the first stars?
• Are liquid abrasives (toothpaste, rubbing/buffing compound, etc) more effective in thinner layers?
• If it were possible to travel east to west in a straight line, how fast would I need to be going for the sun to stay in the exact same spot in the sky? (say high noon or 12:00)
• Does the brain receive the full resolution of our retina? Or is there some sort of preprocessing that reduces the number of pixels?
• Why do pure red and blue lights on the same plane appear to be at different distances?
• How does vertical thermosyphon evaporator works?
• What gives neural networks an advantage over other machine learning solutions?
• Are some genes more susceptible to evolution than others?
• Is there an increase in serum AST in hemolytic blood disorders ?
• [Physics] If everyone on Earth stood very tightly packed in one area, would we have a gravitational pull? What would we be able to pull in?
• When did the perception of pediatric head trauma change from the misconception that children would recover better because of enhanced neuroplasticity?
• Why "binary" alkaloid and not a dimer?
• What happens to a planet between two binary stars?
• [Medicine] Why are some medicines required to be taken with food, and others to be taken on an empty stomach? What's the difference, and can they be designed to work in different ways?
• Why do stars fuse for so long?
• Have any animals evolved to counteract Human impact on nature?
• How do they measure altitudes on other planets without "sea level" as a reference point?
• Is there a light-independent method for tattoo removal?
• Is there any reason for the base pairs of DNA are the ones we have? are there theoretically possible other base pairs?
• Does CVID limit cytokine production?
• Why do bald men (and perhaps women) maintain a ring of hair after they go bald?

[Astronomy] Do we know enough about the heavy metal output of supernovae to speculate as to what the mass of the first generation of stars was? What do we know about the first stars? Posted: 18 Dec 2016 07:04 PM PST submitted by /u/elliotron [link] [comments]

Are liquid abrasives (toothpaste, rubbing/buffing compound, etc) more effective in thinner layers? Posted: 18 Dec 2016 04:01 PM PST I have noticed while working on my car and hand-buffing scratches that liquid abrasive products seem to be more effective when less is used. Do liquid abrasives lose efficacy when excess material "cushions" the effective abrasive surface from the cloth? submitted by /u/MissBelly [link] [comments]

If it were possible to travel east to west in a straight line, how fast would I need to be going for the sun to stay in the exact same spot in the sky? (say high noon or 12:00) Posted: 18 Dec 2016 07:16 PM PST submitted by /u/JDRuzkin [link] [comments]

Does the brain receive the full resolution of our retina? Or is there some sort of preprocessing that reduces the number of pixels? Posted: 19 Dec 2016 06:11 AM PST submitted by /u/ReasonablyBadass [link] [comments]

Why do pure red and blue lights on the same plane appear to be at different distances? Posted: 18 Dec 2016 06:40 PM PST With Christmas coming up, I've been reminded of a phenomenon I first noticed nearly 20 years ago. Pure red and blue light, say a flat display of Christmas lights, appears to me at different distances despite being on the same plane. Photographs of red and blue lights do not do the effect justice, so I've created a demonstration image that is much more pronounced. (oddly enough, though the blue appears father it experiences more parallax as I move my head around. This is the opposite of what one would expect if if the blue was actually farther than the red) In line with the photographs of pure red and blue not always exhibiting this effect, I noticed that slightly non-pure colors also fail to reproduce this effect well. In MS Paint the default RGB values for their reddest red and bluest blue are 237,28,36 & 63,72,204 respectively and did not reproduce the effect. I selected 255,0,0 and 0,0,255 for the original demonstration image. I've seen this effect in Christmas lights, pure red and blue on LCD monitors, CRT monitors, and even on businesses. You'll notice that the business photo is just white and blue, so perhaps it's something more to do with blue light, but it seems more pronounced when compared to red. In fact, I just tested this with Pure R, G, & B text and confirmed it's only blue that exhibits this effect for me. I've tested this effect with others. My wife didn't see it when looking at Christmas lights, but did notice it when I created these demonstration images. My current hypotheses are: Chromatic aberration of the glasses we both wear. I'm not sure about this because my daughter noticed the effect and doesn't wear glasses. Chromatic aberration of our eye's lens, cornea, and/or vitreous fluid (I think this is my leading hypothesis after reading up a bit) There's something different about the depth at which the blue cones detect blue light Some combination of previous hypotheses. This hypothesis seems to be supported by what I found on this page while googling. Some other reason. So, why is this happening? submitted by /u/zornathan [link] [comments]

How does vertical thermosyphon evaporator works? Posted: 19 Dec 2016 06:33 AM PST What is the pressure drop in evaporator that allows circulation? submitted by /u/EngineerGirl_thrwaw [link] [comments]

What gives neural networks an advantage over other machine learning solutions? Posted: 19 Dec 2016 05:51 AM PST submitted by /u/Frozaken [link] [comments]

Are some genes more susceptible to evolution than others? Posted: 19 Dec 2016 05:43 AM PST I vaguely remember Dawkins writing in The Selfish Gene that it could be possible that evolution selects for 'evolveability'. Making it easier for mutations to hit genes that make (for example) butterflies be attracted to different flowers, but not genes that are important for them wanting nutrition. He said (if I remember correctly) that there was no real evidence for this, but that it could be possible. Has anything been found on this since then? submitted by /u/Rietendak [link] [comments]

Is there an increase in serum AST in hemolytic blood disorders ? Posted: 19 Dec 2016 05:27 AM PST Hello /r/askscience, I am a med student and today we wondered about the question in the title. In our biochemistry class, we were explicitly told that there is AST in RBCs, so obviously increase in serum AST is the consequence of hemolysis. However, today in an oncology class a hematologist/oncologist told us that this fact is never used, and he cannot think of a single disease of RBCs that would lead to increase in AST (obviously excluding those involving liver and other AST-rich organs and tissues). What do you, the medical professionals of /r/askscience, think about that ? Thank you. submitted by /u/ASTRBC [link] [comments]

[Physics] If everyone on Earth stood very tightly packed in one area, would we have a gravitational pull? What would we be able to pull in? Posted: 19 Dec 2016 02:01 AM PST submitted by /u/JESSE191 [link] [comments]

When did the perception of pediatric head trauma change from the misconception that children would recover better because of enhanced neuroplasticity? Posted: 19 Dec 2016 01:16 AM PST I've read in many places that childhood head injuries were often seen as warranting less concern than injuries of similar severity in adults because the developing brain had a greater degree of "plasticity" and this meant it could compensate for the negative impact of the injury. The current research says that childhood head trauma is actually usually more severe than adult injuries of similar severity because it impairs the development of normal abilities. At what point did this perspective start to change and since when has the "more recent research" started to correct this misconception? Would it have been the eighties, the nineties, or earlier? When did this knowledge start to become mainstream in the medical community? submitted by /u/tobiasnash [link] [comments]

Why "binary" alkaloid and not a dimer? Posted: 19 Dec 2016 02:18 AM PST If indol makes chemical bonds with dihydroindol it isn't considered as a dimer but rather "binary" alkaloid. Anyone know why this is not branded as a dimer? submitted by /u/Terglav [link] [comments]

What happens to a planet between two binary stars? Posted: 18 Dec 2016 01:04 PM PST It's been a while since I've taken any physics course and I was legit stumped by this question. Came up because of a D&D sesh with this particular setting, if anyone's curious. What I'm wondering is, if a planet is right in the middle of two binary stars orbiting each other, what happens to the planet? Does is it move at all? submitted by /u/LilPhattie [link] [comments]

[Medicine] Why are some medicines required to be taken with food, and others to be taken on an empty stomach? What's the difference, and can they be designed to work in different ways? Posted: 19 Dec 2016 03:24 AM PST I'm currently on a course of antibiotics for an ear/throat infection. These are the kind that you have to take on an empty stomach. The instructions are "Two hours after food, or one hour before food". This is inconvenient, as it means you have to carefully plan both your pill-taking and meals. I've also in the past taken some medicines which required me to take them with food, or just before. These are much easier to take, as you just make sure you eat something when you take it. What is the difference? Why must some be taken on an empty stomach and others not? Is this an inherent feature of the drugs being delivered, or is it "designed" in some sense? What is it about certain drugs which requires food or no food? Basically just very curious about how and why there is a difference :) submitted by /u/low_flying_aircraft [link] [comments]

Why do stars fuse for so long? Posted: 18 Dec 2016 02:52 PM PST Why is it that stars take billions of years to use all of their material? Why doesn't the material burn up (fuse) all at once or more quickly? submitted by /u/ColdPorridge [link] [comments]

Have any animals evolved to counteract Human impact on nature? Posted: 18 Dec 2016 09:26 AM PST I know that Humans have adapted to our habitat, but what I'm curious about is that how the animal kingdom has reacted to that. This might include anything from small changes in their diet, I'm just curious as to a couple of adaptions. submitted by /u/Pengking36 [link] [comments]

How do they measure altitudes on other planets without "sea level" as a reference point? Posted: 18 Dec 2016 05:07 PM PST submitted by /u/ErectileDysfuctioner [link] [comments]

Is there a light-independent method for tattoo removal? Posted: 18 Dec 2016 12:19 PM PST The only tattoo removal services I'm aware of rely on laser burns in order to progressively remove the ink. Is there any other approach, for example, from the top of my head, solvents that dilute it? submitted by /u/bowling_brawls [link] [comments]

Is there any reason for the base pairs of DNA are the ones we have? are there theoretically possible other base pairs? Posted: 18 Dec 2016 10:03 AM PST We have Adenine, Cytosine, Guanine, and Thymine as the base pairs of DNA, but are there other amino acids, even theoretically, that could form DNA? do they need to be those 4 molecules? submitted by /u/poptart2nd [link] [comments]

Does CVID limit cytokine production? Posted: 18 Dec 2016 10:24 AM PST Every paper I read says something different about the cytokines released/reduced in CVID. Can someone please clarify for me if CVID limits cytokine production and why exactly it does? submitted by /u/Gmoore5 [link] [comments]

Why do bald men (and perhaps women) maintain a ring of hair after they go bald? Posted: 18 Dec 2016 05:09 PM PST I was on the subway and saw several men with varying degrees of Baldness. One thing they had in common was that they all still maintained a ring of hair around the crown of their heads. submitted by /u/hekatonkhairez [link] [comments]

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How do suds (bubbles) influence a soap/detergent's cleaning ability? [Chemistry]

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• How do suds (bubbles) influence a soap/detergent's cleaning ability? [Chemistry]
• What is the current state of String Theory?
• Can neutrinos interact with each other?
• Is there a theoretical maximum of magnification/zoom (for a telescope/microscope)?
• What does it mean if a compound is exergonic?
• Why is the oxidation of wine influenced by temperature?
• How do we know how much electricity is in a lightning bolt?
• What causes some cpu heatsink designs to work better than others?
• What would life be like on Earth if we didn't have a moon?
• Does each zero of the reimann zeta function correspond to a prime number?
• Is it possible to "add" protons to an atom in a lab/accelerator and discover new elements? And why does an atom having just an extra proton than another atom make the two completely different elements? What property of protons causes this, if any?
• Why is there a temperature of combustion (as opposed to just heat)?

How do suds (bubbles) influence a soap/detergent's cleaning ability? [Chemistry] Posted: 18 Dec 2016 05:42 AM PST For example, if I'm soaking a pan or running a bath. Do more bubbles = cleaner? submitted by /u/Big_Chips [link] [comments]

What is the current state of String Theory? Posted: 17 Dec 2016 09:58 PM PST submitted by /u/RAINING_DAYS [link] [comments]

Can neutrinos interact with each other? Posted: 17 Dec 2016 10:03 AM PST They barely interact with standard matter. submitted by /u/heliumagency [link] [comments]

Is there a theoretical maximum of magnification/zoom (for a telescope/microscope)? Posted: 18 Dec 2016 06:09 AM PST Is there a phisycal limit of a possible magnification/zoom? Or we could theoretically zoom to an atom in a grain of sand on a planet in a galaxy 1 billion light years away? Thanks! submitted by /u/umjustpassingby [link] [comments]

What does it mean if a compound is exergonic? Posted: 17 Dec 2016 08:45 PM PST It says here that the binary fluorides of xenon are exergonic, but it also says they are stable at room temperature. What am I missing? If energy is going out of the compound? How is it stable? submitted by /u/quaoarpower [link] [comments]

Why is the oxidation of wine influenced by temperature? Posted: 18 Dec 2016 04:27 AM PST Hello reddit! Today I was searching for a good way of storing wine after opening the bottle and I have noticed that a corked bottle at room temperature will last 1 day, but if it is stored in the fridge, it could last up to 2 days, because the oxidation process is much slower. So why is that? Why is oxidation influenced by temperature? Thanks. submitted by /u/exmorMagnus [link] [comments]

How do we know how much electricity is in a lightning bolt? Posted: 17 Dec 2016 09:16 AM PST It seems like at the voltages and amperes that a bolt can produce it would damage the equipment used to measure it submitted by /u/rsmithspqr [link] [comments]

What causes some cpu heatsink designs to work better than others? Posted: 17 Dec 2016 04:27 PM PST The first thing I have seen is obviously different materials such as copper vs aluminum. But Im speaking more about the design of the heatsink like 1 fin stack or 2 fin stacks, or 4 or 8 heat pipes what makes 1 dissipate heat better than the other? Im not sure if this would go under physics but I think this would because it would be considered thermodynamics. submitted by /u/Yep9901 [link] [comments]

What would life be like on Earth if we didn't have a moon? Posted: 17 Dec 2016 12:15 PM PST And if anyone is willing to, could you explain what theoretical effects having two moons would bring? Thank you! submitted by /u/Icarus1333 [link] [comments]

Does each zero of the reimann zeta function correspond to a prime number? Posted: 17 Dec 2016 12:08 PM PST If so, what is the mapping function(s)? submitted by /u/blazingkin [link] [comments]

Is it possible to "add" protons to an atom in a lab/accelerator and discover new elements? And why does an atom having just an extra proton than another atom make the two completely different elements? What property of protons causes this, if any? Posted: 17 Dec 2016 11:58 AM PST submitted by /u/blueredscreen [link] [comments]

Why is there a temperature of combustion (as opposed to just heat)? Posted: 17 Dec 2016 10:12 AM PST I've never been good with thermodynamics. For various fuels - hydrogen, acetylene, etc -- you can find a temperature of combustion. E.g., hydrogen burns at 2800C. But why is there a particular temperature associated with the process? The chemical reaction releases heat -- but shouldn't the temperature be dependent on some equilibrium between the reaction making heat and the environment removing it? Why is that a number we can pin down decently well? Shouldn't it be dependent on airflow, reflectivity of nearby surfaces to infrared, and other factors? Maybe another hypothetical - suppose you preheated your fuel and oxygen (separetely) before combining them, say, up to 1000C. Shouldn't the temperature of the flame then be almost 1000C hotter (the same amount of heat is being added by the chemical reaction)? submitted by /u/garnet420 [link] [comments]

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