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Sunday, December 23, 2018

How do some air-freshening sprays "capture and eliminate" or "neutralize" odor molecules? Is this claim based in anything?

How do some air-freshening sprays "capture and eliminate" or "neutralize" odor molecules? Is this claim based in anything?

How do some air-freshening sprays "capture and eliminate" or "neutralize" odor molecules? Is this claim based in anything?

Posted: 22 Dec 2018 05:17 PM PST

If a males testicles are removed before puberty occurs does the male grow to be the size they would have been if the testicles were still there?

Posted: 22 Dec 2018 05:00 PM PST

To add to my question, would the removal of the testicles before puberty cause the person to be uninterested in sex after they would have otherwise gone through puberty?

submitted by /u/ODE4555
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What is physically happening in the brain when we forget something?

Posted: 22 Dec 2018 05:54 PM PST

How are the voices of objects such as GPS systems or Alexa created? Do the programs use voice samples to create sentences in real-time, or is everything pre-recorded?

Posted: 23 Dec 2018 02:25 AM PST

How does herpes work? Why cant it be cured and how does it appear in specific locations on the human body?

Posted: 22 Dec 2018 04:03 PM PST

I know there are two major types of herpes virus but how is it possible that they appear in specific loactions? Why cant we get some type in some places?

Finally, how is this virus incurable?

submitted by /u/himaximusscumlordus
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Is real space and reciprocal space in condensed matter a covariant and contravariant basis respectively?

Posted: 23 Dec 2018 04:48 AM PST

I'm very familiar with the condensed matter principles but I'm self studying tensor Calculus over Christmas. It seems like they are very similar concepts, they obey almost the same othorgonality, and the unit vectors transform slightly differently. In one, by a mix of dot and cross products and in the other by a metric tensor. With these differences in mind, can these concepts be considered equivalent? Perhaps one is a generalization of the other?

Lastly, in condensed we transform functions into the reciprocal space via the Fourier transform, is this a general relationship between functions in covariant and contravariant spaces?

submitted by /u/digitalmus
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How does this "watercoloring" kid's book work?

Posted: 22 Dec 2018 11:19 PM PST

My Friend's Kid has this coloring book, how does this work?

For those of you who've never see this before it's a coloring book that's blank. When you add water, the colors appear. Once it dries the colors fade and you're left with a white page again.

I'm really curious about the science behind this, what's happening here?

submitted by /u/phizrine
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What is the Hercules-Corona Borealis Great Wall?

Posted: 23 Dec 2018 12:01 AM PST

I have heard this mentioned as the largest structure in the universe at ten billion light years across. What is it, why is it classified as a single structure, what is it made of and how does it exist?

submitted by /u/Miloisprettycool
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How is yield on atomic and hydrogen bomb explosions meassured?

Posted: 23 Dec 2018 04:13 AM PST

I mean physically? What kind of device or contraption is actually used? Wouldnt the explosion just vaporize any meassureing device?

submitted by /u/overlydelicioustea
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What makes a programming language "good" for certain tasks?

Posted: 22 Dec 2018 06:39 PM PST

For example, I've heard that Python is a "good" language for data analysis, and C# is for building apps. Theoretically, all programming languages should be able to do the same things, so what makes one better for a certain task? Is it the standard libraries?

submitted by /u/graphicviolins01
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Why do MRI scans take a moderate amount of time to complete, while fMRI scans are able to function in near-continuous manner (i.e. on an order of seconds instead of hours)?

Posted: 22 Dec 2018 07:57 PM PST

What temperature is the surface of a puddle?

Posted: 23 Dec 2018 05:54 AM PST

The other day my friend said the surface a puddle was at 100 degrees. I explained the difference between evaporation and boiling.

Then they replied with this

'Some of the water will evaporate and you could work out how much energy that transfers and link that to a temperature, which would be surprisingly high. KE =3/2kT.'

Isn't that just the average Ke? If that equation was applied to one or two particles at the surface. What would the temp actually be? Can this equation actually be applied. I have confused myself.

Any help appreciated.

submitted by /u/RJ5xx
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How do snail’s shells stay on?

Posted: 22 Dec 2018 03:45 PM PST

How do humpback whales separate all thier food from the thousands of gallons of water it comes with?

Posted: 22 Dec 2018 06:07 PM PST

Is it possible to have two planets orbiting one star, but they orbit on opposite sides of said star?

Posted: 22 Dec 2018 10:09 AM PST

I know its been asked before, but I have specific questions I didn't see asked. The details of this scenario:

A Sol-like star (age, size, composition, etc.) with two planets in the exact same orbit, and inclination. I understand the mathematic improbability of this, and that this is, if it existed or exists, a most unlikely natural occurrence. But I just want to know, even if by unnatural means, this would be a stable system, or if they would be slowly torn up by gravitational effects between the three bodies?

I am rather ignorant to most of physics so barney-style this (simplify) as much as you can please!

submitted by /u/xKINGxJOLTEONx
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How did NASA first dealt with radiation in space ?

Posted: 22 Dec 2018 04:22 PM PST

Specifically with the computers. How could they function when first going to the moon?

submitted by /u/A_Tricky_one
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Could "active light cancelling" exist?

Posted: 22 Dec 2018 07:25 PM PST

As of today, we have developed efficient active noise cancelling technology that we can find in popular headphones. Could the same idea apply to light, even if we are talking about EM waves and not mechanical waves?

submitted by /u/Thmsrey
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Besides opposable thumbs, what other steps in evolution led to humans?

Posted: 22 Dec 2018 03:16 PM PST

I grew up taught that giraffes probably started as regular necked animals like horses, but the food was too high so "they evolved to have longer necks".

I now understand that life doesn't evolve intentionally. Mutations occur which the life form must use to survive, or die. Giraffes who just happened to be born with sightly longer necks could better reach the food, so they survived and bred, and over enough generations the longer necked ones continued to be better able to survive so the longer the neck, the better the chance to survive and breed.

Opposable thumbs gave us the ability to manipulate small objects and the smarter of us figured out how to make tools... From my limited understanding of human evolution, the fabrication of tools was one of the major steps in human evolution.

What other events/achievements were possible only for humans, due to an early mutation?

Thanks!

submitted by /u/infinitum3d
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What is the evolutionary advantage of the tibula and fibula being separate and not one combined bone?

Posted: 22 Dec 2018 12:21 PM PST

Are there any sub/species that feed solely through cannibalism? If not, is such a thing theoretically possible?

Posted: 22 Dec 2018 04:14 PM PST

Why do you lose consciousness when you get hit by something? And what exactly happens when trying to recover from it and how do you wake up? Is it like waking up when you are done sleeping?

Posted: 22 Dec 2018 12:24 PM PST

Title explains. Is there a specific process that affects the nervous system to be knocked out and what exactly does it do when trying to wake up?

submitted by /u/Edgardus
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Saturday, December 22, 2018

Are there any differences between they way earlier species of humans experienced pregnancy and birth and the way we experience it now?

Are there any differences between they way earlier species of humans experienced pregnancy and birth and the way we experience it now?

Are there any differences between they way earlier species of humans experienced pregnancy and birth and the way we experience it now?

Posted: 21 Dec 2018 10:23 PM PST

Things like gestation periods, how the body reacts to pregnancies, the way the pregnancy itself progresses - is there anything that has changed over time, even perhaps between now and a couple centuries ago?

submitted by /u/couldulikenotbro
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Can we repair damaged brain parts/tissues? Other organs have proved to be successful but how about the ever-complicated brain?

Posted: 21 Dec 2018 10:42 PM PST

What happens to aquatic life when a lake freezes over? Do the animals and plants somehow hibernate, or do they find a way to live under to ice? Where would they get oxygen?

Posted: 21 Dec 2018 07:32 PM PST

Is the large intestine itself the cause of foul odor or is it the food and gut bacteria combination?

Posted: 21 Dec 2018 05:25 PM PST

So I've been reading about women who were born without a vaginal cavity, or transgender woman who get srs, doctors using the sigmoid colon as the vaginal cavity and I have a question.

So there seems to be this hearsay that this vaginal cavity would produce a bad odor.

But phsyiologically and biologically speaking, is this even possible?

Is the intestine itself the cause of bad odor when we deficate or is it the food mixed with gut bacteria that causes the bad smell?

And wouldn't this smell not be possible if a part of the intestine was used to line a vaginal cavity?

submitted by /u/KandiceKame
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Can anything be temporarily magnetized in the presence of a strong enough magnetic field?

Posted: 22 Dec 2018 12:12 AM PST

I know that only ferromagnets can stay magnetized after the magnetic field is removed, but as for objects being temporarily magnetized, I was not able to find any definitive answers through google. I also checked on this sub, and found a few questions that were related, but the answers seemed a bit inconclusive so I figured I would ask again.

submitted by /u/Supernova141
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If by depressurising we can go from solid to liquid to gas. How about from gas going to plasma?

Posted: 22 Dec 2018 04:10 AM PST

I'm wondering if by applying pressure we can go from gas to liquid. How about depressurizing gas into plasma?

I've learned this thing called PAW(plasma activated water) from TUe. They use electricity.

But the effects treated water on e.g. growing plants or keeping vaas flowers better, is similar to what I've seen with water treated by a simple passive device where tapwater is pushed through the hole of what has the shape of an hourglass, but after the pressure increase it comes out and depressurized instantly.

Hence my question; could both methods of treating water, actually be based on the same idea; creation of plasma.

submitted by /u/houtm035
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How do scientists measure things like size, weight or the age of planets?

Posted: 21 Dec 2018 01:16 PM PST

What causes the Koch snowflake to have a infinite perimeter?

Posted: 21 Dec 2018 11:17 PM PST

Why Can't you just create a circuit in the shape of the Koch snowflake and measure light from point A to point B?

A and B represent 1 interval around the Koch snowflake. If it doesn't take infinite time to get from A to B would that prove the perimeter is finite?

I know almost next to nothing about a circuit. So take that into consideration when answering the question.

submitted by /u/earlnw
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Why do some planes have more propellor props/arms than others? Does it have to do with cruising speed?

Posted: 21 Dec 2018 05:08 PM PST

Does the size of a brain directly affect intelligence?

Posted: 21 Dec 2018 08:16 PM PST

Many neuroscientists seem to agree that the main determining factor of intelligence lies in the molecular activity at the synapses, but I've also read that the part of Einstein's brain that dealt with logic and reasoning was physically larger than the average person's which may have contributed to his superior intelligence. Both sides of the argument bring valid points and I'm not sure which to believe.

submitted by /u/Duke_Demise
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Why do we experience this “call of the void” in front of a big drop?

Posted: 21 Dec 2018 01:55 PM PST

What are the differences between male and female eyesight?

Posted: 21 Dec 2018 05:05 PM PST

There was a conversation on the way home from work tonight, VR was brought up and that it can cause a form of "travel sickness". I remember hearing that during testing more females responded to this sickness than males. I also recall hearing somewhere about the differences in eyesight for men and woman and it went something like this: male's have better depth perception and females have better periphery vision. I've never been able to find studies suggesting this but I have come a study mentioning that the different sexes view colour differently.

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Could someone explain to me what the modern scientific position is on the differences in male and female eyesight.

Thanks and Merry Christmas all

submitted by /u/CriticalBeatdown
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Is there anything notable about the other focus of an orbital ellipse?

Posted: 21 Dec 2018 08:20 PM PST

Kepler's laws of planetary motion says that planets orbit the sun in an ellipse with one of the foci being then sun. Is there anything of note at the other focus though?

submitted by /u/sacrelicious2
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How do cars accurately measure the temperature while ignoring wind chill?

Posted: 21 Dec 2018 12:33 PM PST

It seems like it would be difficult to get an accurate measurement if the car moves at fast speeds, hence creating wind and introducing a wind chill effect.

submitted by /u/burritomobile
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At the end of the Permian era, we see a greenhouse gas effect situation happen because of a volcanic eruption and bacteria... how did the planet recover from this?

Posted: 21 Dec 2018 12:09 PM PST

When speaking about the current situation with global warming I often hear warnings about how a positive feedback loop of planetary warming could lead to a situation like the greenhouse gas effect on Venus.

However, vast amounts of CO2 and methane have been released into the atmosphere previously in the earth's history (and though it was cataclysmic) it seems that the earth recovered and did not continue to warm.

What happened before to stabilize the climate? Is it likely to happen again in the future?

submitted by /u/satansbride13
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Do our pheromones change as we age?

Posted: 21 Dec 2018 01:12 PM PST

If we had very good chemistry/attraction with someone in high school, if you don't see them for 30 years, will that spark still be as strong, or will our pheromones have changed so that won't be the same?

submitted by /u/fsutrill
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Why doesn't the Earth's elliptical orbit affect its temperature (Cause Seasons)?

Posted: 21 Dec 2018 08:35 AM PST

I keep hearing that the Earth's tilt is responsible for seasons and that the angle of incidence of the sun's rays are the main player.

But, the tilt cause a change of distance of around 5000km whilst Earth's orbit can cause a change of 5000000km. I don't get how this doesn't play a role in seasons change. I know the the heat is spread along a big surface area when the angle of incidence increases, but I fail to comprehend how this has a much larger effect than 5 MILLION km change in distance.

Does this have to do with how the heat is transferred? (ie. Radiation)

submitted by /u/ekhaled1836
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Friday, December 21, 2018

If a rectangular magnetic "plate" has an object hovering over it, and I pick up the plate, do I feel the weight of both or only the magnet plate?

If a rectangular magnetic "plate" has an object hovering over it, and I pick up the plate, do I feel the weight of both or only the magnet plate?

If a rectangular magnetic "plate" has an object hovering over it, and I pick up the plate, do I feel the weight of both or only the magnet plate?

Posted: 21 Dec 2018 04:24 AM PST

So this is a project I saw in a conference today, and with my limited knowledge of highschool physics I though this felt completely bullshit. The Idea was a backpack with magnets that carry the stuff inside it so you don't have to. But according to Newton's first law, isn't the person carrying the backpack still feeling the weight of what's inside + the weight of the magnets?

submitted by /u/Alib902
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Whats the mechanism that allows us to know when we've had enough water?

Posted: 21 Dec 2018 12:46 AM PST

So, if we're dehydrated and we have a glass of water how can our brain know that it was enough if the water wasn't absorbed and homeostasis wasn't reached?

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submitted by /u/fuckalphanumeric
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Can we learn things while we sleep?

Posted: 20 Dec 2018 07:49 PM PST

I see videos on YouTube that are a few hours long and are meant to be listened to while sleeping to help learn the language.

Does watching these videos help do anything while sleeping?

submitted by /u/netherbawss235
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Is radioactive decay temperature-dependent?

Posted: 21 Dec 2018 05:58 AM PST

Does the rate of radioactive decay for an isotope vary with temperature? For example uranium-235 has a half-life of 703.8 million years, but would cooling to absolute zero (or very close to absolute zero) have a significant influence of the rate of decay?

submitted by /u/_TheRealMVP_
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Is there a Doppler effect for quantum mechanical wave functions?

Posted: 21 Dec 2018 04:29 AM PST

Essentially they are also linear waves, right?

submitted by /u/Hot_Investment
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What is the difference between a white surface and a mirror?

Posted: 21 Dec 2018 07:26 AM PST

Both of these surfaces reflect light, but one gives white, but the other gives the actual color. Why?

submitted by /u/sredditram
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What actually happens to someone’s body when they “freezes to death”?

Posted: 21 Dec 2018 06:36 AM PST

What happens inside someone's body when they get hypothermia and die? What is stopping the body and nervous system from working in extreme cold?

submitted by /u/BigLew611
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Will my phone charge faster/more if my portable battery is in a higher position than my phone?

Posted: 21 Dec 2018 01:58 AM PST

I've been wondering if the battery has to "push" electrons, so that if the phone is in a lower position, charging will be more efficient.

submitted by /u/togapops
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Can whales use their mouths to breathe as well as their blow holes? If so can they do so independently of each other?

Posted: 21 Dec 2018 07:30 AM PST

Do other animals get headaches? What is happening inside the head during a headache?

Posted: 20 Dec 2018 09:41 AM PST

Do insects/animals pass down memories to their offsprings? Are spiders' ability to create complex cobwebs without being taught just plainly "instinct"?

Posted: 21 Dec 2018 02:22 AM PST

Like with some birds and their intricate nests, bees and beehives, etc.

I asked this here several years ago but never got a concrete answer. All of those skills/actions seems to come from complex knowledge from memory rather than just plain instinct to me but I dunno anything deeper about it really. I'm also wondering if there are recent studies about it and if they could bring more light. It's just something that I've been curious about since I was a kid.

submitted by /u/buod
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How exactly do certain drugs cause damage to the liver? Does it always regenerate?

Posted: 20 Dec 2018 08:40 PM PST

Alcohol through my understanding is toxic to the liver because the byproduct of first metabolism of ethanol, acetylhyde, just damages the liver. How?

Also drugs that aren't broken down into something toxic like acetaldehyde, say phenibut, how does that damage the liver overtime? (Apparently phenibut can cause fatty liver in large dosages over time).

Concerning regeneration: I've read that a liver can recover from 1/4 it's original size compared completely. If that's the case why does full blown cirrhosis have no recovery?

Thank you!

submitted by /u/patientlydenied
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Is there any scientific evidence that anti-aging,anti-wrinkle creams, and similar remedies work?

Posted: 21 Dec 2018 05:02 AM PST

Do vocal cords affect the "timbre" of an individual's cough? Or are they entirely separate functions?

Posted: 20 Dec 2018 10:25 PM PST

Copper has four shells with 2, 8, 18 and 1 electrons, being the later the outmost shell. We know that electrons occupy shells according to their energy level. What happens if in the copper case, we remove one electron from the inner shell? Will outer shell electrons move to occupy the vacant space?

Posted: 21 Dec 2018 02:10 AM PST

I mean, one electron from the second shell decays to occupy the vacant space in the first shell, and so one? or will the spot continue vacant? If the first option is true, what element we will have after that? It is not copper anymore, isn't it?

submitted by /u/CoolAppz
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How do organs and body parts know when to stop growing?

Posted: 21 Dec 2018 07:54 AM PST

For example, how do the cells of the nose know to stop multiplying once they get to a certain size. I understand that genetics control things such as nose size, but is DNA aware of when the body parts grow to the appropriate size and proportions.

submitted by /u/GrassAndKitties
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Do trains use a disproportionate amount of fuel accelerating from a stop to their operating speed? Can this be quantified for a train of a given weight and power output?

Posted: 21 Dec 2018 07:45 AM PST

Trains are quite fuel efficient due to the low friction levels between steel wheels and steel rail. Once a train is up to operating speed it seem like you'd only have to use enough fuel to overcome that low friction level, air resistance, and gravity if you were going up a hill. Does this mean a disproportionate amount of fuel is consumed while accelerating from zero to operating speeds?

Let's assume a flat track of 100 miles in length, a train weighing 10,000 tons, and a power to weight ratio of 2hp per ton: how much fuel does the train consume to move that 100 miles? How much fuel is used in the first two miles vs the last 98?

submitted by /u/MountainMantologist
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Is there an area of effect for radiation?

Posted: 20 Dec 2018 06:22 PM PST

There were experiments on the demon core which took several lives due to radiation exposure. If the incident hadn't been quickly stopped, would the core have just remained in a critical state until it eventually decayed or would it over heat and melt or would it explode? Also, what sort of area would be consider lethal due to radiation?

submitted by /u/jesshiltz
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Why are fungal infections/diseases rarer than bacterial or viral infections?

Posted: 20 Dec 2018 09:30 PM PST

Diseases that are most prominent in the public consciousness are always viral or bacterial. Most awareness for diseases caused by fungi seems to be limited to fungal skin infections.

Are there serious fungal diseases that are widespread? If no, then why not?

submitted by /u/vegankush
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Does a car's combustion engine work in space? Specifically, would it work in a vacuum?

Posted: 21 Dec 2018 06:56 AM PST

I want to know if you could drive a car in an airless environment. Assume gravity is the same as earth. (Or not, if you want to score bonus points.)

submitted by /u/FalconAt
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There are indications that cannabis might have regulative properties in diabetics, does quitting the consumption of cannabis products produce a diabetic upward spike?

Posted: 20 Dec 2018 10:22 PM PST

Layman here. I've read on this article that cannabis may be a regulating factor in diabetics by stabilizing blood sugar levels. Are there any indications that suddenly quitting the consumption of cannabinoids may produce a negative effect in regulating blood sugar, and if so for how long and how can the system return to its normal levels?

submitted by /u/JesusDeSaad
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How closely could a satellite orbit a moon or planet that has no atmosphere?

Posted: 20 Dec 2018 04:00 PM PST
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