Pages

Sunday, December 16, 2018

What’s stopping the water in lakes from seeping into the soil and ‘disappearing’?

What’s stopping the water in lakes from seeping into the soil and ‘disappearing’?


What’s stopping the water in lakes from seeping into the soil and ‘disappearing’?

Posted: 15 Dec 2018 04:57 PM PST

Thought about this question when I was watering some plants and the water got absorbed by the soil. What's keeping a body of water (e.g. in a lake) from being absorbed by the soil completely?

submitted by /u/weh_town
[link] [comments]

There is a scene in the movie Skyfall where the villain removes his upper jaw, exposing his scarred and almost destroyed face, and claims it was due to a Hydrogen Cyanide capsule. Could Hydrogen Cyanide actually do that kind of damage? Would the villain have even survived in reality?

Posted: 15 Dec 2018 04:53 AM PST

How do annual vaccines remain in the bloodstream for a year instead of wearing off a few days later? Additionally, why are some shots (I.E. Tetanus) recommended every X years instead of annually?

Posted: 15 Dec 2018 06:22 PM PST

How can i control the wavelength of light when i pass it through an object using refraction?

Posted: 15 Dec 2018 08:26 PM PST

Hey redditors!

I am currently working on a design on a product that involves the refraction of UV light through a certain object (prism or something, haven't decided yet) in order to refract the light. However, it is extremely important for the light to be a specific wavelength once it is refracted and any changes in the wavelength could ruin the whole product design. I was wondering what factors we would have to account for to make sure the wavelength of the light remain constant when passed through the object and what sort of object I would have to use in order to refract the light without changing its wavelength?

submitted by /u/aadi_968
[link] [comments]

If infrared light is hot, then why doesn't visible light cook us? Visible light has more energy than infrared, right?

Posted: 15 Dec 2018 09:14 PM PST

Is there a byproduct of the production of alcohol that is destroyed in the process of distillation?

Posted: 15 Dec 2018 04:56 AM PST

If I drink a beer, a wine, or a cider, it will trigger a migraine. However, the trigger is not alcohol itself. I can drink whiskey, vodka, rum, or whatever until it gives me a headache from the hangover like any other human being. But if so much of a sip of a fermented alcohol passes my lips, I'm shortly hiding in my darkened room under all the covers. If I'm able to identify a trigger down to the chemical compound, it might enable me to better avoid migraine triggers so I'm very grateful for any input! 😊 I'm really hoping this doesn't violate the rules since the motivation to ask this is based in my personal healthcare.

submitted by /u/Diblums
[link] [comments]

Why don't animals like Seals suffer from decompression sickness?

Posted: 15 Dec 2018 05:53 AM PST

Why is music around the world based on octaves? Do they share common roots like the Indo-European languages? Is there music in other parts of the world that's not based on eight notes and their harmonics?

Posted: 15 Dec 2018 01:05 AM PST

Why can alpha and beta radiation not penetrate particularly thick materials?

Posted: 15 Dec 2018 10:44 AM PST

Is it true that vehicles (cars, semi-trucks, boats) have a tighter right-hand turning radius than a left-hand turning radius? Why is this?

Posted: 15 Dec 2018 05:12 AM PST

I remember watching a video (like a couple years back) about remote controlled cars and how some cars will take longer to make the same left turn as they did with a right turn. The guy in the video drove the car in a circle with it doing the tightest possible circle it could on each side, and the left-hand turn made a much bigger circle than the one that came about from the right-hand turn.

submitted by /u/HotdogLegend27
[link] [comments]

A glass breaks when it experiences a big enough temperature difference. But will repeated, smaller temperature differences over time eventually cause the glass to break?

Posted: 15 Dec 2018 12:12 AM PST

I apologise in advance if this has been asked, but for the life of me, I couldn't find a clear answer.

I regularly pour hot water into the same glass and have never had any problems. Until yesterday, when the glass cracked. Now, I realise it could have been a particularly cold day, or hotter water than usual, which caused a greater-than-usual temperature difference, which is why it broke on that day, but none of the other hundreds of times I've poured hot water into it.

But I did wonder, could the repeated stress over time, (caused by me filling the glass with hot water every day) have caused it to "fatigue" in some way? Or create tiny cracks or weak points? Such that, the last pour - rather than causing a greater-than-usual temperature difference - was really the "straw that broke the camels back"? And, acting on years of "fatigue" or "stress build-up" cracked an already vulnerable glass?

OR, does glass not work that way?

Thanks for any answers! I know it seems like a fairly obvious question, but I just couldn't find an exact answer.

submitted by /u/jfartster
[link] [comments]

What's the natural form of Asbestos and how is it found in the mineral bed?

Posted: 15 Dec 2018 12:09 AM PST

On the news about the J&J Asbestos issue they claimed that Asbestos and Talc are often found together in similar mined veins and this would cause the cross-contamination...This is the first I'd heard of asbestos being a (mineral?) at all and I'd like to know a bit more about how it occurs in nature.

submitted by /u/Bcadren
[link] [comments]

Saturday, December 15, 2018

What are the simplest animals that sleep? Amoebas? Hydras? Water Bears? Zooplankton? Or what?

What are the simplest animals that sleep? Amoebas? Hydras? Water Bears? Zooplankton? Or what?


What are the simplest animals that sleep? Amoebas? Hydras? Water Bears? Zooplankton? Or what?

Posted: 14 Dec 2018 10:18 PM PST

Do unvaccinated people pose a danger to vaccinated people? Why or why not?

Posted: 14 Dec 2018 07:32 PM PST

Disclaimer: I am vaccinated, and all for vaccinations, I underatand the importance of them fully. I overheard a coworker the other day say he didn't agree with forcing people to be vaccinated because the only pose a risk to themselves by not being vaccinated. I just want a way to rebutle his claim in a rationale way, or just to understand better myself. Thanks!

submitted by /u/UncleGreggers
[link] [comments]

How different was plant life during the time of the dinosaurs vs now?

Posted: 14 Dec 2018 09:10 PM PST

I would think there were more trees and CO2 consuming plant life than there is now, but are there any records or evidence that details how much more abundant it was?

submitted by /u/Ramher_Jamher
[link] [comments]

Aren’t all animals part of the carbon cycle?

Posted: 15 Dec 2018 05:17 AM PST

How does farming of cows and other animals affect global warming? I understand that they produce methane which is more harmful than CO2 but isn't all the carbon just recycled in the end? Say if the number of animals in the world was held constant wouldn't we reach an equilibrium of CO2 in the atmosphere?

submitted by /u/tummmmmar
[link] [comments]

Can specific freckles/moles and their locations on the body be hereditary?

Posted: 14 Dec 2018 09:15 PM PST

I know that having freckles vs not having freckles is genetic, but what about single specific freckles? My mother and I have a freckle on the exact same spot of our bodies. Not a tiny freckle, but a dark and distinct one that makes it seem like more than a fluke. Same goes with my father's side. My grandfather has a small mole on his face and my father has one that's the same size in the exact same spot. I also have this mole except maybe an inch down from where theirs are.

submitted by /u/celestialvx
[link] [comments]

Why doesn't cholesterol build up in places other than the heart and brain?

Posted: 15 Dec 2018 07:19 AM PST

I never hear about someone losing an arm, leg, liver or kidney due to buildup. It's always in the heart or brain...why is that?

submitted by /u/Lyuseefur
[link] [comments]

When we wake up for a minute in the middle of the night, do we end our sleep cycle and start a new one?

Posted: 14 Dec 2018 04:18 PM PST

So let's say you wake up in the 3rd stage even if only for a minute and you sleep in again, do you continue with the 3rd/4th stage or do you start all over again?

submitted by /u/MyLaneBeLike
[link] [comments]

How conductive is plasma, relative to something like copper or salt water?

Posted: 15 Dec 2018 12:06 AM PST

I remember listening to a sciencey song with the line '[in plasma] electrons are free' and I'm wondering if that means it is very conductive like other substances with delocalised electrons.

submitted by /u/edweirdoE
[link] [comments]

How accurate are modern IQ tests in measuring intelligence? What type of stuff do they measure, is it more right-brain or left-brain? And can someone with a high IQ be bad at certain basic things, e.g. spelling, remembering where he/she put his keys? What’s the best way to measure intelligence?

Posted: 15 Dec 2018 02:41 AM PST

Do cephalopods, e.g. squids, octopuses, have a dominant tentacle/arm similar to humans having dominant hands/feet?

Posted: 15 Dec 2018 06:49 AM PST

And if yes, is the dominance wired to the left/right side of its body as it is in humans, or can one out of x tentacles be the dominant one, with no respect which half of the body it is on?

submitted by /u/TrebuchetTurtle
[link] [comments]

How do we get bacteria in our intestines?

Posted: 15 Dec 2018 06:43 AM PST

Main question how the bacteria survive the acidic environment of the stomach and get to the intestine?

I know we have bacteria in our stomach too, most of them are aerobic and an environment in the intestine is anaerobic. Can they change the way they work at will?

submitted by /u/attabey
[link] [comments]

Are ants and bees susceptible to diabetes? Why or why not?

Posted: 15 Dec 2018 06:26 AM PST

Do organisms living in complete darkness (caves, deep water, underground) have a circadian rhythm? Most organisms do, but does it ever appear in those that have no access to a 24 hr cycle?

Posted: 15 Dec 2018 05:55 AM PST

When is an island an island, and when is it big enough to be "land"?

Posted: 14 Dec 2018 02:34 PM PST

Sorry but this stupid question is in my mind since this morning.

submitted by /u/originalusername107
[link] [comments]

My toddler likes to play with my glasses, and it got me thinking. How do doctors determine babies need glasses?

Posted: 14 Dec 2018 05:31 PM PST

I'm assuming there is some sort of test, but babies can't tell you if 1 or 2 looks better. So how do they find visual impairment in infants? Is there a drastic difference in a visual test? What about babies who see things just a little blurry, do they slip through the cracks?

submitted by /u/reanqu
[link] [comments]

Is atmospheric pressure due to molecular collisions or gravity?

Posted: 14 Dec 2018 05:29 PM PST

On one hand, we are told that pressure in a gas comes from the molecules bouncing against everything and itself and exerting a force against the surfaces they collide with.

On the other hand, we hear that the pressure of the atmosphere comes from the fact that there is so much atmosphere being weighed down above us.

Where is the connection or bridge between these two?

submitted by /u/enzotiger
[link] [comments]

If graphene is a single layer of carbon atoms, how would it conduct electricity?

Posted: 14 Dec 2018 09:37 PM PST

Essentially asking the mechanics of how graphene conducts electricity. Is it possible to make a super durable/malleable wire/"tape" that can conduct electricity for a cheap price?Any research papers I can dive into too?

submitted by /u/gidude_
[link] [comments]

What sound does a kangaroo make? Any at all?

Posted: 14 Dec 2018 07:26 PM PST

How is the frequency response of a microphone determined?

Posted: 14 Dec 2018 05:17 PM PST

How do engineers and manufacturers verify that the microphones they produce have a flat frequency response? Wouldn't such verification require a sound transducer that displaces a known volume of air to work over a similar frequency range, or multiple transducers of overlapping frequency bands? Do such standards exist? If so, how are they calibrated?

submitted by /u/Killavolt
[link] [comments]

What makes and erupting volcano like the 1883 eruption of Anak-Krakatau loud enough to be heard at great distances?

Posted: 14 Dec 2018 08:57 PM PST

Is there a way to create 3D models of small objects, a few cm across, that would be accurate down below a millimeter in resolution?

Posted: 14 Dec 2018 02:29 PM PST

I know this is not a direct "science question", but a technical question for scientists/engineers. It is non-hypothetical, closed-ended, with a definite answer, and targeted at the science community at large, so I hope it will not run afoul of sub rules.

Anyway, I am aware of LiDAR used to scan large areas (rooms, buildings, etc), but am not aware of a way to capture a high resolution virtual model of something like a chess piece or acorn that wouldn't cost a million dollars. Is this within our technical capabilities at this time, outside of massive machines like MRIs?

submitted by /u/MomentarySpark
[link] [comments]

How does Riemann integration work with hyperreals?

Posted: 14 Dec 2018 09:20 PM PST

All the discussions of integration with the hyperreals I've seen prove that the Riemann sum is finite, but not that its standard part is something other than 0. My confusion stems from the fact that the product of any finite number and an infinitesimal is itself an infinitesimal, as is the sum of two infinitesimals. So if we say the Riemann sum Σf(x)dx really is adding a series of numbers that have been multiplied by the infinitesimal dx, it sounds like we would get an infinitesimal result. What am I missing?

submitted by /u/plugubius
[link] [comments]

Friday, December 14, 2018

I saw a video of someone breathing in a rag of chloroform and getting instantly knocked out. I don’t think that’s real, but it made me curious. How does chloroform work? And what exactly does it do?

I saw a video of someone breathing in a rag of chloroform and getting instantly knocked out. I don’t think that’s real, but it made me curious. How does chloroform work? And what exactly does it do?


I saw a video of someone breathing in a rag of chloroform and getting instantly knocked out. I don’t think that’s real, but it made me curious. How does chloroform work? And what exactly does it do?

Posted: 14 Dec 2018 05:22 AM PST

How does a muscle attach to a tendon and how does a tendon attach to a bone?

Posted: 13 Dec 2018 08:24 AM PST

Is it physical structures like microscopic hooks/anchors? Some kind of biological "adhesive"?

Edit: Question answered. Several very knowledgeable people have done a great job of explaining that there is no "attachment" rather there is no end between bone/tendon and muscle, they all just merge into each other. Which is pretty amazing when you think about it. Thanks everyone.

submitted by /u/NaughtyFred
[link] [comments]

How do water molecules on opposite spokes of a particular flake "know" to reproduce a specific pattern?

Posted: 14 Dec 2018 05:56 AM PST

When groups of animals that use echolocation do so, how are they able to differentiate which sound was theirs? Can a dolphin that’s in the middle of a group pick up on the sound of another dolphin that’s on the outer edge of said group and know exactly what the other dolphin is seeing?

Posted: 13 Dec 2018 09:24 AM PST

I was watching Blue Planet and being underwater hearing all of the clicks and whistles the dolphins were using made me wonder if all of the dolphins heard each other. Does one big pod(?) of dolphins make a huge beacon of sonar that allows each dolphin in the group to see what the others are seeing? If not and it's comparable to "how can you tell when your mother or sister calls you?", is it the frequency that each individual dolphin uses to determine which sound was theirs? Can they only hear one frequency at a time? If not, underwater must be so loud...

submitted by /u/smallwhales
[link] [comments]

Are nebulae and gas clouds in space dense enough that sound could travel through them?

Posted: 14 Dec 2018 06:47 AM PST

I'm basically wondering if in a nebulae you could hear stars being created

submitted by /u/AWellSpokenBully
[link] [comments]

Because CO doesn't ever unbind from hemoglobin until the red blood cell dies, wouldn't a blood transfusion be an effective treatment for people who have CO poisoning?

Posted: 13 Dec 2018 07:02 AM PST

Are there limits (low or high) to the frequencies that lasers can emit?

Posted: 14 Dec 2018 06:16 AM PST

Do radio receivers draw some power from the radio waves they receive?

Posted: 14 Dec 2018 01:30 AM PST

I was thinking about this the other day. When I turn on my car radio, does it actually draw some power from the EM field, weakening it? Can this affect other receivers nearby, making the signal weaker for them?

submitted by /u/IndependentGuy
[link] [comments]

Do the effects of dyslexia change depending on the native language of the affected person?

Posted: 13 Dec 2018 06:30 AM PST

I was wondering specifically about languages with logographic/syllabic alphabets like Chinese, Japanese, or Korean. The structure of Hangul in particular seems like it would be harder to misspell or misread a character since they are (sorta) like an instruction manual for how to pronounce each individual syllable.

I don't speak any of those languages fluently though so I could be way off base here.

submitted by /u/thelastknowngod
[link] [comments]

What are the other differences besides temperature (boiling points etc.) between water and oil that makes water 'boil' food and oil fry?

Posted: 13 Dec 2018 07:10 AM PST

Does an electron jump back down from it's excited state to it's initial state spontaneously or is there a definite interval involved before it jumps back down?

Posted: 13 Dec 2018 03:54 PM PST

If all it takes is moving charges to create a photon does this mean that simply waving a statically charged comb back and forth (or in a circle) is generating photons?

Posted: 13 Dec 2018 04:50 PM PST

How were the first atomic clocks calibrated without an existing frequency reference that was fast and accurate enough to measure the frequency stability?

Posted: 13 Dec 2018 03:26 PM PST

We know antennas transmit by oscillating between positively charged and negatively charged rapidly like a sine wave. But what happens if you were to rapidly force a negative charge into an antenna and then discharge it to a neutral and then do it again? What kind of EM wave would that create?

Posted: 13 Dec 2018 05:09 PM PST

Pulses? is that even possible?

submitted by /u/Blueninja1000
[link] [comments]

Are the signals sent by nerves in our body "digital" or "analog"?

Posted: 13 Dec 2018 11:45 AM PST

I've wondered this for a while. Are the signals sent by nerves in our body "digital" meaning that they are simply on or off, or analog, sending an increased signal when more pressure or heat is applied?

If they were digital they'd send "more signal" by simply more nerves being activated.

If they're analog... then what do they look like?

submitted by /u/corrado33
[link] [comments]

What happens when two batteries are in parallel?

Posted: 13 Dec 2018 03:24 PM PST

Statistically speaking, how common are sex chromosome variations (eg. XXX, XXY) in the general population?

Posted: 13 Dec 2018 05:02 AM PST

For example, in a group of 1000 people how many would have chromosomes other than XX or XY?

submitted by /u/wnokie
[link] [comments]

Why does greater Mongolia have so much rare earth metals?

Posted: 13 Dec 2018 09:55 AM PST

Most rare earths (Cerium, Gadolinium, etc.) are mined in Inner Mongolia, and Mongolia proper has a lot of it too. What's so special about the historic Mongol lands that gives them so much of these useful elements?

submitted by /u/SlavophilesAnonymous
[link] [comments]

Are String Theory "Fuzzballs" and Loop Quantum Gravity "Plank Stars" the same thing?

Posted: 13 Dec 2018 12:33 PM PST

If I understand correctly, and I probably don't, they both hypothesize that at and inside the event horizon there is some sort of super dense "material", strings in ST and I don't know what in LQG.

Both seem to solve the information paradox (inside the black hole there is no infinite collapse to a singularity, so information is not lost) and both stay black holes for any far away observer.

Are Fuzzballs == Plank Stars?

submitted by /u/hvgotcodes
[link] [comments]

Why do blue stars tend to reside closer to the galactic plane?

Posted: 13 Dec 2018 10:21 AM PST

I was recently on the 1000,000 stars site and they showed how blue stars tend to reside closer to the galactic plane. Why is that?

submitted by /u/AGiantRetard
[link] [comments]

How does HIV resistance work? Is it similar to antibiotic resistance?

Posted: 13 Dec 2018 09:15 AM PST

In practical terms, if once a type of medicine no longer works against the pathogen, and you change your medicine, and the pathogen develops a new resistance again, and so on... Will it at some point become vulnerable again to your first medicine?

If it's possible to develop resistance to multiple medicines, how is the new pathogen not vulnerable in ways it was not vulnerable before? Isn't picking up an advantageous trait also confer a potential weakness we can exploit? How does evolution and natural selection play out here?

submitted by /u/shivabreakstheworld
[link] [comments]

How do scientist knew back in the days when chemical elements were discovered if you had a mono constituent substance?

Posted: 13 Dec 2018 01:00 PM PST

How do Biologists Determine what “Normal” is for a New Species?

Posted: 13 Dec 2018 07:50 AM PST