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Sunday, November 12, 2017

Does body temperature impact cognitive performance? If so, is there an optimal temperature?

Does body temperature impact cognitive performance? If so, is there an optimal temperature?

Does body temperature impact cognitive performance? If so, is there an optimal temperature?

Posted: 11 Nov 2017 11:24 PM PST

How were the number of atoms in a mole determined?

Posted: 12 Nov 2017 01:08 AM PST

I'm trying to do a bit of reading on this and what I've read so far doesn't seem to get at it. I get the definition of there being 6.02x1023 atoms in 12 grams of carbon 12, but how did they 'count' the atoms in those 12 grams?

submitted by /u/yogononium
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Are our brain's wrinkles unique to each individual like fingerprints or are they mostly the same shape with few variations?

Posted: 11 Nov 2017 05:27 PM PST

Does toasted bread contain less calories than normal bread?

Posted: 11 Nov 2017 03:20 PM PST

How is the metamorphosis of a caterpillar into a butterfly currently explained by darwinian evolution? or science in general?

Posted: 11 Nov 2017 06:47 PM PST

Do singers struggle to perform in cities with higher altitudes whilst on tour?

Posted: 11 Nov 2017 04:26 PM PST

If alcohol is a toxin, does that mean that inebriation and the after-effects of drunkenness is basically the body's response to a poisonous substance?

Posted: 12 Nov 2017 01:17 AM PST

When metal boils, does it release metal vapor in the bubbles?

Posted: 12 Nov 2017 06:34 AM PST

Correlation between cosmic microwave background and "snow flurry" on TV?

Posted: 12 Nov 2017 06:11 AM PST

Once I have heared, that the black-white interfering signal on TV, which occur when you don't have a TV-signal (in my country it's called "snow flurry"), is due to the cosmic microwave background. Do someone know more about this? It makes sence to me if the TV-signal is in microwave range - but I don't know much about TV tech.

submitted by /u/Spac3junkie
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What causes the motor whine in electric motors?

Posted: 11 Nov 2017 07:32 PM PST

If the stress-energy tensor generalizes stress and the metric tensor is analogous to strain for spacetime, is there a corresponding analogue of elasticity for spacetime?

Posted: 12 Nov 2017 01:10 AM PST

To preface, I apologize if this is an ill-phrased question. I'm a novice learning relativity. Since elasticity relates stress and strain, and since the Einstein Field Equations relate stress-energy-momentum to curvature (Ricci plus metric), I was wondering if relativity has its version of elasticity relating the two as one big tensor. I'm more interested in existence than utility, so I'd love to know about it even if it's an irreconcilably unwieldy object.

submitted by /u/CobaltSthenia
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If all of the sound, light, motion, and heat that my computer produces eventually just become heat, is it just as efficient to heat my Room using the computer as with a space heater?

Posted: 11 Nov 2017 03:52 PM PST

I guess you lose some energy from the sound or from vibrations escaping the Room

submitted by /u/Heymaaaan
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What did ocean mollusks such as Clams evolve from?

Posted: 11 Nov 2017 07:23 PM PST

I assume that clams, mussels and the like didn't start as organisms with large, hard shells, but hey evolved them. If so, what did they evolve from?

submitted by /u/rslashstfu
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Why can some species only live in saltwater or in freshwater?

Posted: 11 Nov 2017 06:53 PM PST

Is it possible to plug the ends of a plasma filament in a linear theta pinch device by using a rectified AC pulse for the theta pinch field sandwiched between two static opposing magnetic fields?

Posted: 12 Nov 2017 04:24 AM PST

I've come across a few studies in which attempts were made to increase the efficiency of linear theta pinch devices using solid plugs and one involving magnetic mirrors, but none involving static fields. I would expect a static field oriented in opposition to the induced field of the plasma to repel the ends of the filament. It would probably have to be ring shaped to prevent the filament from veering to the sides(similar to how a top is contained by a levitron) or require some other method of stabilization. The idea is simple but I can't find any information on past attempts so I figure there must be a reason it wouldn't work.

Maybe if the static electromagnets were close enough together that the width of the chamber was greater than the length and the strength of the static fields relative to the theta pinch were tuned right(static fields should be stronger), the filament might reach equilibrium in a deformed torus shape(with a cross-section shaped like dragonfly wings or teardrops facing outward and no actual center hole) due to the geometry of the static fields and the compression, so a stabilizing mechanism might not be necessary. This might also mitigate the "wobble" instability.

submitted by /u/stevp19
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Why are airplane seatbelt buckles different from the ones in cars?

Posted: 11 Nov 2017 03:38 PM PST

Do the different designs make one better for a certain application than the other? Is it different safety standards?

submitted by /u/dicktaphone
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What causes the crinkling sound in paper and some plastics?

Posted: 11 Nov 2017 07:18 PM PST

What is causing the sound? Are the polymers/fibres under pressure so once you move them they snap back and make a sound?

submitted by /u/spybio
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Does modern medicine impact evolutionary elimination of hereditary disease?

Posted: 11 Nov 2017 04:35 PM PST

Are both sides of DNA important in regards of mutations?

Posted: 11 Nov 2017 03:50 PM PST

If I understand it correctly mRNA is synthetized from only one side of the DNA spiral (3' -> 5') so according to me it is not important if there are mutations on the other side of DNA spiral (5' -> 3') because the RNA polymerase does not read it. For example the mutation on DNA base like [A T->C] = [A C] will be lost because mRNA will comprise only A.

submitted by /u/limitedmtgfan
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If gravity can be described as the result of the curvature of space, why can’t other fundamental forces, such as Electromagnetism or the Strong Nuclear Force, be described in the same way?

Posted: 11 Nov 2017 08:30 PM PST

How many satellites are in space right now? And how long is their lifespan? Also, how are satellites already in space affected by technological progresses? Are they becoming outdated space trash but still functioning?

Posted: 11 Nov 2017 01:56 PM PST
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Saturday, November 11, 2017

From a cost stand point, would it not make sense to build duplicates of space probes and send them to different locations?

From a cost stand point, would it not make sense to build duplicates of space probes and send them to different locations?

From a cost stand point, would it not make sense to build duplicates of space probes and send them to different locations?

Posted: 11 Nov 2017 05:54 AM PST

Does the long term use of antidepressants cause any change in brain chemistry or organization?

Posted: 10 Nov 2017 10:13 AM PST

Meaning, any permanent changes that persist even after stopping?

submitted by /u/monkeynose
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How do modern laundry detergents compare to ones from 25 or 50 years ago?

Posted: 11 Nov 2017 04:36 AM PST

With most laundry detergents today advertising new and better formulas all the time, how much progress has there really been in the long term? Is it a lot easier to get clothes clean and stain-free today than it was, for example, in the sixties or the eighties?

The reason I'm asking, is that I rarely see any unremovable stains or other problems with my clothes after a single wash in a 40C cycle - perhaps I see a problematic stain only once or twice a year. (This is with the exception of old clothes I use for yard work or car repair, which I don't expect to get clean at all). Yet, all the ads make it seem like stains are a huge issue - so is this just marketing BS, or is it something that would have been the case some time ago?

submitted by /u/stjuuv
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How do cartographers decide which tributary is the main river?

Posted: 11 Nov 2017 05:36 AM PST

How does one read information from qubits?

Posted: 11 Nov 2017 05:57 AM PST

When the qubits are being read by the outside world, they would collapse - how do we make sure they collapse so that the information is accurate?

submitted by /u/reddit_korea
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How can natural gas combustion produce CO?

Posted: 11 Nov 2017 05:46 AM PST

I've read that natural gas burning furnaces can cause CO poisoning if the gas improperly vented or combusted. But I lived in a flat with an unvented gas heater for years and never experienced symptoms of poisoning. Could it be that the flat was too drafty?

submitted by /u/awesomesalsa
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How much saltier is the Atlantic than the pacific ocean?

Posted: 10 Nov 2017 07:35 PM PST

What is it about jet engines that makes them so loud?

Posted: 10 Nov 2017 11:25 AM PST

How do space probes beam pictures back to earth while being so far away?

Posted: 10 Nov 2017 11:53 PM PST

Will precession mean that this Veterans Day monument slowly goes out of alignment?

Posted: 10 Nov 2017 11:56 PM PST

https://www.reddit.com/r/interestingasfuck/comments/7c2su2/every_veterans_day_nov_11_at_1111_am_the_sun/

If so, can we calculate by how much, or after how many years it will become noticeable?

submitted by /u/tartanbornandred
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How does brain decide which memory to keep and make it easy to access?

Posted: 10 Nov 2017 05:13 PM PST

I have watched the movie Seven only once, and it was like 10 years ago or so, and I can recall the first 10 minutes of the movie crystal clear, every word of every sentence. On the other hand when someone asks me about my father's birthday, I need to actively think to remember it. On subconscious level, my father should mean a lot more to me because he is and has been a big part of my life. So why do I remember dialogues perfectly in a heartbeat, from a movie I've watched 10+ years ago which is not even in my top 50, while I need to think for couple of seconds to remember my father's birthday?

submitted by /u/lorrotardev
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Why are London Dispersion Forces called dispersion forces?

Posted: 11 Nov 2017 01:04 AM PST

To disperse means to spread, so why are attractive forces named after something that seems to be opposite to what they do?

submitted by /u/Morefoolish
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How does the sun cause colours to fade or wash out?

Posted: 10 Nov 2017 06:58 PM PST

Why do things left in the sun tend to fade or lose their colouring?

submitted by /u/CantStopNeedMore
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Is it possible to shoot an electron straight into the nucleus of an atom?

Posted: 10 Nov 2017 07:20 PM PST

What voltage does the human body use to control muscles?

Posted: 10 Nov 2017 04:33 PM PST

As most people know the human body uses electricity to control muscle movement through contraction.

I was wondering what voltage is actually used if at all comparable and just how similar the mechanism the human body uses are to the mechanism of electricity of a house and such

submitted by /u/IWatchFurryPornAMA
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Does our sense of smell degrade with age like vision and hearing?

Posted: 10 Nov 2017 05:03 PM PST

What tells one cell to do or become one thing while another cell does or becomes something else?

Posted: 10 Nov 2017 09:39 PM PST

How large does an object in space need to be in order to gravitationally bind an average human to its surface?

Posted: 10 Nov 2017 03:54 PM PST

Will a liquid that boils at room temperature burn me?

Posted: 11 Nov 2017 03:09 AM PST

And if so, why?

Edit: Thanks one and all

submitted by /u/dredge_the_lake
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Is there a real threat to wasting water besides the money it cost?

Posted: 11 Nov 2017 04:47 AM PST

As kids they warned us about wasting water, but wouldn't running a lot of clean water down the drain help the sewage system by diluting the dirty water?

submitted by /u/bluntsgunsmoney
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Does fusion occurs to some atoms in Jupiter/saturn due to Quantum tunnelling effect?

Posted: 10 Nov 2017 06:53 PM PST

Is there any other factor contributes to fusion other than quantum tunnelling?

Do quantum tunneling probability increases with temperature/pressure?

submitted by /u/asking2die
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What is the best explanation for why the inside of the Earth is still hot?

Posted: 10 Nov 2017 08:44 PM PST
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Friday, November 10, 2017

Is there any underlying reason we say protons are positive and electrons are negative? Would it work if we just switched both in all our equations?

Is there any underlying reason we say protons are positive and electrons are negative? Would it work if we just switched both in all our equations?

Is there any underlying reason we say protons are positive and electrons are negative? Would it work if we just switched both in all our equations?

Posted: 09 Nov 2017 07:35 PM PST

What I mean is, is there any reason we say protons are positive and electrons are negative; so if we just switched every equation would they be just as correct?

submitted by /u/NewtonsFourth
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How long does it take for protons to return to being randomly oriented after an MRI scan?

Posted: 09 Nov 2017 10:27 PM PST

Is it instant?

submitted by /u/ten_mile_river
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How can scientists be sure that the iPTF14hls supernova is at exactly the same spot as the this supernova in the 60s?

Posted: 10 Nov 2017 01:06 AM PST

They talk about a zombie star and what not, but wouldn't it be more plausible that there is another star nearby that exploded because of this supernova from 1954? Would it even be possible to exactly measure a distance of 60 light years in a galaxy so far away?

submitted by /u/Denny_Westside
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In the periodic table, why does the D block start with 3d, rather than 4d?

Posted: 10 Nov 2017 05:24 AM PST

Why does period 4 have 4s, then 3d? Shouldn't it be 4d?

submitted by /u/JorbKranklin
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Does Quantum Mechanics Allow for the Possibility of Different Eventualities?

Posted: 10 Nov 2017 04:53 AM PST

To Expand on what I mean:

Given the state of the universe at time t1. Does the universe have a chance of evolving into different potential states at t2?

or.. If we could some how rewind the universe after t2 back to t1 is there a chance it could evolve into a state different to the one previously?

Does quantum mechanics call out causal determinism? And why?

Thank you in advance. :)

submitted by /u/tip-top-honky-konk
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Is there a protocol or concept on how we would define date and time on other planets?

Posted: 10 Nov 2017 06:05 AM PST

How was Newton's gravity equation derived if we didn't know the specific quantities involved? How could you check your math with the evidence to verify it's correct? (Such as the masses of planetary objects or the distance between them?) Said another way, how did we compute the masses of planets?

Posted: 10 Nov 2017 05:11 AM PST

In Newton's equation for the force of gravity, he derived F = GmM/r2 and then that has been used to calculate, say, the masses of the planets in our solar system as well as the sun. What i don't understand is how that was able to be accomplished considering you need all of the values except for one in order to solve the equation (for a specific value).

So, for example, if I want to know the mass of the moon, I need to already know the mass of Earth, its distance to the moon, the gravitational constant as well as the force of gravity between the two! Which quantities became known first in order to figure out these things??

submitted by /u/ShittyShittyNameName
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Does the brain interact with programming languages like it does with natural languages?

Posted: 08 Nov 2017 08:48 AM PST

Dark energy is the cosmological version of Vacuum Energy, right?

Posted: 10 Nov 2017 05:38 AM PST

As far as I understand, dark energy = the void of the universe.

It is the "vacuum energy" from a cosmology perspective.

This energy helps expand the universe even further. It pushes away matter. As far as I understand, it has a negative gravitational pull. (Or a positive gravitational push.)

Let me know if I am wrong here. If not, going on:

If we take a shielded container, and make it as perfect as a vacuum as we possibly can, would it's gravitational pull be slightly lower than the weight of the container parts?

submitted by /u/litehacker
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How effective are the various winterizing window treatments, and what are the common mistakes? Specifics in post...

Posted: 09 Nov 2017 11:29 PM PST

Specifically talking about the plastic sheeting kits over windows. Do the laws of thermodynamics come into play, and if so, how? Is it better to do sheeting inside, outside, or both? Is there any truth to the recent fad of putting bubble-wrap on windows being better than sheeting? Is this sort of insulation a "weakest link" scenario where it's only as good as the worst part, or is it a drip-scenario where if you can plug 9 out of 10 leaks then you increase your savings by 90%? What sort of R-factor are we talking about for each scenario? Please go into as much detail as possible, while keeping it relatively laymen in answers. Thanks!

submitted by /u/agent_uno
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If stars use up their hydrogen before exploding and then a new system forms (like ours) where does the hydrogen in that system come from?

Posted: 09 Nov 2017 09:21 AM PST

Are old rock strata "usually" flat?

Posted: 09 Nov 2017 09:31 PM PST

This is something I've wondered for a while, but it's seems shockingly hard to find straight answers about it. At least, not from a variety of sources.

Exposed layers of rock always seem to be flat, maybe angled in some cases, but they would have been flat at one time. Yet today we mountains all over, places like the Grand Canyon extending for miles in area, and cutting through millions of years of rock.

And yes, this question comes from the related young-earth argument: that the lack of evidence of surface irregularities in millions of years of rock strata implies a very quick deposition period. A bunch of people probably downvoted this on sight. But when I search for anything regarding this specific topic, all that comes up are resources supporting their view. It's hard to get anything from the other side.

So, what is the reason for the flatness of rock strata? Is it a sample size issue? Meaning, there is evidence somewhere, but it isn't exposed? Am i just relatively uniformed, and there are plenty of places where rock strata shows signs of major irregularities?

submitted by /u/ytsejamajesty
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Do our finger nail bed grow, or are they permanent?

Posted: 09 Nov 2017 11:43 AM PST

Does physical activity durring puberty effect adult weight?

Posted: 09 Nov 2017 07:40 PM PST

The wording is kind of weird. Essentially I want to know if someone that gains a significant amout of muscle mass durring puberty due to physical training, say 30 pounds, will ever naturally loose weight back to the previous weight as an adult.

As an example I went from 160lbs to 195lbs during my freshman year of high school while wrestling while only growing 2 inches in height from 70 inches to 72 inches. As an adult the lightest I have been since is 185lbs despite a significantly lower activity level. The muscle just seemed to stay on. If I hadn't worked out as hard during this time period would I have stayed closer to 170lbs as a normal weight or was my 195lbs weight inevitable?

submitted by /u/BeerfromHeaven
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How much more complex is a CPU than a GPU?

Posted: 09 Nov 2017 02:07 PM PST

I know a few concepts about a CPU architecture. e.g. pipelining, branch-prediction, superscalar, out-of-order execution, VLIW,...

I also know that a GPU has multiple "cores" working in parallel, and that allows them to do much more operations that a CPU.

However, I am expecting that a GPU "core" is much more simpler that a CPU "core". (they have a narrow application field that a CPU).

The question is, what are the concept designs that are used in one(CPU) but not in the other(GPU)?

Do GPU's use branch prediction, out-of-order execution?

Thanks

submitted by /u/atariPunk
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Does running on an inclined treadmill involve significantly more work than running on a flat treadmill?

Posted: 09 Nov 2017 11:42 AM PST

Conventional wisdom says yes. Even calorie burn estimators say you use a lot more energy on an inclined treadmill. But there's no net displacement in opposition to gravity. I guess you could theoretically be slightly elevating your body with every step and then be slightly lowered by the machine on the back-step, but it seems like the mechanics of running are such that you're mostly only beginning to support your body weight against falling when your foot is out in front of you with the majority of the propulsion occurring only after your front foot is nearly under you. Plus it just seems like your body would kind of naturally move differently when not required to actually combat gravity by climbing from a kinesthetics standpoint.

I guess this would ultimately depend on an individual's gait, which can be pretty idiosyncratic. Is running/walking consistent enough of a movement to draw conclusions based on physics? If not has there been any statistical study of this question? (Couldn't figure out how to add a second flair.) Are all of those treadmills that say you're burning like 50% more calories on the incline mode full of shit and just using numbers based on actual uphill running? Or is there a legitimate scientific basis for those kinds of claims?

submitted by /u/CreedDidNothingWrong
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Will gravitational wave detectors help us peer into the nature of dark matter?

Posted: 09 Nov 2017 10:23 AM PST

My popular science "education" (no formal physics in my background, please dumb down your answer as much as you can) says that we're having a helluva time figuring out what dark matter is because it refuses to interact with "normal" matter in a measurable way. My takeaway from that is that perhaps we shouldn't assume that it is composed from massive particles at all. All we can see are its gravitational effects on a very large scale (galaxies, clusters of galaxies). So I was wondering if ever more sensitive GW detectors can be used to "look a little closer" (than we can with optical astronomy) at the regions of space where gravitational forces indicate apparent presence of undetectable mass? Looking for WIMPs assumes that DM is composed of some massive particles. Can GW detectors be a way to look at the problem without the need for that assumption?

submitted by /u/coderpete
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What's going on biologically that makes teens more prone to acne?

Posted: 09 Nov 2017 02:13 PM PST

What would happen if a meteor struck a nutron star?

Posted: 09 Nov 2017 11:23 AM PST

Are there other animals that closely assist the mother during childbirth?

Posted: 09 Nov 2017 02:59 PM PST

I was wondering if any species has this habit.

submitted by /u/D_Ciaran
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