Liquids can't actually be incompressible, right?

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• Liquids can't actually be incompressible, right?
• Has the Earth always rotated about 24 hours and orbited about 365 days? Or is it accelerating/decelerating? In the far future, say 250 million years or so, will it still be going at the same speed with 24 hour days etc?
• How are we able to measure the temperature of inaccessible objects such as the surface and core of the sun or the earth's core?
• Watching an new documentary about Rome and a thought crossed my mind, would it have been possible for candlelight concentrated in big cities to have caused light pollution?
• What ecological effect will planting 20 million trees actually have?
• Where does the CO2 collected by trees go? Does it go back to the atmosphere when the tree dies?
• Why does dengue cause low platelet count?
• Why do we perceive our “self” to reside in our heads?
• Do bugs/flies end up dying during a heavy storm or do they have somewhere to go?
• Is the increase in rates of depression among Western countries linked to the change in diets over the past decades?
• As we start to plant more trees should we be worried about what species of trees are planted at specific locations?
• Do the gravitational fields of other planets in our solar system influence Earth and/or our Moon in any way?
• If we put a person on speaker during a call, why can't he/she hear her own voice back , through the phone mic?
• Why does power/weight ratio dominate acceleration at slow speeds, but then straight horsepower seems to take over at high speeds?
• Simple question. Why do we feel a colder wind when we move fast? (On a bike for instance)
• How do earthworms sense vibration?
• What is the physiology behind why hot things, such as wasabi, “clear out your sinuses”?
• What affects continental drift?
• What is the effect of overexpressed cation channels on resting membrane potential?

Liquids can't actually be incompressible, right? Posted: 26 Oct 2019 05:54 PM PDT I've heard that you can't compress a liquid, but that can't be correct. At the very least, it's got to have enough "give" so that its molecules can vibrate according to its temperature, right? So, as you compress a liquid, what actually happens? Does it cool down as its molecules become constrained? Eventually, I guess it'll come down to what has the greatest structural integrity: the "plunger", the driving "piston", or the liquid itself. One of those will be the first to give, right? What happens if it is the liquid that gives? Fusion? submitted by /u/BarAgent [link] [comments]

Has the Earth always rotated about 24 hours and orbited about 365 days? Or is it accelerating/decelerating? In the far future, say 250 million years or so, will it still be going at the same speed with 24 hour days etc? Posted: 26 Oct 2019 06:53 PM PDT submitted by /u/CuddlyCory [link] [comments]

How are we able to measure the temperature of inaccessible objects such as the surface and core of the sun or the earth's core? Posted: 26 Oct 2019 05:05 PM PDT submitted by /u/I_Am_IM [link] [comments]

Watching an new documentary about Rome and a thought crossed my mind, would it have been possible for candlelight concentrated in big cities to have caused light pollution? Posted: 26 Oct 2019 05:41 PM PDT submitted by /u/fannypackoftruth [link] [comments]

What ecological effect will planting 20 million trees actually have? Posted: 26 Oct 2019 11:27 AM PDT 20 million trees does seem like a lot, but is it enough to even make a dent in the amount of CO2 humans are producing? Is it money well spent to spend $20 million of planting 20 million trees? submitted by /u/bigboyparpa [link] [comments]

Where does the CO2 collected by trees go? Does it go back to the atmosphere when the tree dies? Posted: 26 Oct 2019 01:06 PM PDT submitted by /u/i_hate_you_and_you [link] [comments]

Why does dengue cause low platelet count? Posted: 26 Oct 2019 08:33 AM PDT I know platelets are responsible for blood clotting but I don't understand how disabling that mechanism could be beneficial for the virus's survival. submitted by /u/rashialimbona [link] [comments]

Why do we perceive our “self” to reside in our heads? Posted: 26 Oct 2019 06:36 AM PDT Is it simply because that's where our brains are located, or our sensory organs, or some other reason? submitted by /u/sketchahedron [link] [comments]

Do bugs/flies end up dying during a heavy storm or do they have somewhere to go? Posted: 25 Oct 2019 11:10 PM PDT We had a storm last night & whilst I was cosy in bed I thought to myself, gosh wouldnt it be awful go be outside... then it occured to me... small insects must get completely annihilated?? I mean, there's floods of water running down the street/garden, the winds are so harsh they're blowing through my house opening all of the doors. So do the smallest of creatures actually have somewhere to go, or is it simply genocide? submitted by /u/Gedj [link] [comments]

Is the increase in rates of depression among Western countries linked to the change in diets over the past decades? Posted: 26 Oct 2019 05:04 AM PDT Been reading about the gut microbe biome and the effects on the brain which got me thinking about the decline in the quality of the Western diet to more red meats and processed foods. submitted by /u/chamasuh [link] [comments]

As we start to plant more trees should we be worried about what species of trees are planted at specific locations? Posted: 26 Oct 2019 04:18 AM PDT submitted by /u/Edittilyoudie [link] [comments]

Do the gravitational fields of other planets in our solar system influence Earth and/or our Moon in any way? Posted: 26 Oct 2019 04:54 AM PDT Pretty much the title. submitted by /u/Krabice [link] [comments]

If we put a person on speaker during a call, why can't he/she hear her own voice back , through the phone mic? Posted: 26 Oct 2019 01:22 AM PDT If i speak they can hear my voice, but not their own voice even though it's loud enough. submitted by /u/brocollion [link] [comments]

Why does power/weight ratio dominate acceleration at slow speeds, but then straight horsepower seems to take over at high speeds? Posted: 26 Oct 2019 07:09 AM PDT Why does power/weight ratio dominate acceleration at slow speeds, but then straight horsepower seems to take over at high speeds? Example: 86 HP motorcycle which weighs 660 lbs (with 200 lb rider). 260 HP per ton. RWD. 306 HP car which weighs 3300 lbs (with 200 lb driver). 185 HP per ton. FWD. Motorcycle dominates acceleration from 0 to 60. Motorcycle wins acceleration from 60 to 100 by maybe 25%. After 100 motorcycle rapidly falls off compared to car. Top speed motorcycle ~135, car ~170. These are real world examples both by the same manufacturer.... bonus points if you guess the vehicles. submitted by /u/electricaldummy17 [link] [comments]

Simple question. Why do we feel a colder wind when we move fast? (On a bike for instance) Posted: 26 Oct 2019 06:26 AM PDT submitted by /u/philoche3 [link] [comments]

How do earthworms sense vibration? Posted: 26 Oct 2019 02:32 AM PDT What kind of organ do they use for it? How did it evolve? Additionally: how do they sense orientation/ gravity? submitted by /u/Luenkel [link] [comments]

What is the physiology behind why hot things, such as wasabi, “clear out your sinuses”? Posted: 25 Oct 2019 01:51 PM PDT Just had a little too much wasabi with my sushi and it got me thinking... submitted by /u/roboprober [link] [comments]

What affects continental drift? Posted: 25 Oct 2019 06:29 PM PDT Speaking in laymen's terms, when I look at the land distribution on a globe, it is not difficult to put all the continents together as I would suppose they once were. What I am wondering is how the separation started as the Pacific Ocean seems a much greater area than the Atlantic Ocean. As well, why did some land masses beak off yet go in a direction different from the rest. Am I wrong in thinking that the momentum of the earths rotation has nothing to do with the way the "skin" of the earth; the mantle moves over time? For instance the lower hemisphere seems to have much greater distances between the continents that the North hemisphere as well as greater vertical separation from the land masses. I also notice when moving the masses together the way they fit that there are areas missing, I would assume (dangerous word I know) that these missing parts could easily be meteor strikes as it would to me make the most sense. How did such strikes affect movement, could they force an either complete change in the direction of the earth's spin perhaps several times over huge periods of time? Or could the force of such impacts just push the land masses apart at greater speed, as a high speed impact would do to anything else? Again I speak only from visual studies. If I am completely wrong please don't hesitate at all to let me know. submitted by /u/Licalottapuss [link] [comments]

What is the effect of overexpressed cation channels on resting membrane potential? Posted: 25 Oct 2019 09:57 PM PDT Hey guys, I'm trying to understand how the resting membrane potential of a cell would influenced if you were to over express receptor operated non-selective cation channels in that cell? From what I understand, if a cells membrane is dominated with ion channels that conduct a specific species of ion (cations in this case) the resting membrane potential would be heavily influenced by the reversal potentials of the ions that can be conducted by those ion channels. And from what I read, the resting potential of such a cell would be at or close to 0 mV. And this 0 mV value is obtained by plugging in the reversal potential and conductance values in the Chord Conductance Equation. Am I understanding this correctly? Any help would be appreciated. submitted by /u/SahilCh95 [link] [comments]

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In an absolute vacuum, does the diameter of a laser beam change over distance?

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• In an absolute vacuum, does the diameter of a laser beam change over distance?
• This may sound dumb, but what makes glass shatter, and not split or crack in half?
• How do veins and arteries bend/twist without blood getting stopped or clogged?
• What exactly is Google's "quantum supremacy" and is this as big of a milestone as they make it out to be?
• How can white light have a continuous spectrum without having infinite energy?
• How many Antigen Receptors are on Helper T cells?
• Helper T Cells and the activation of B and Cytotoxic T Cells?
• Why are some languages (Kanji and Traditional Chinese, for example) written as "pictures", so to speak, and western languages are based more on syllable structures? Is there a historical reason for it?
• How good is the sense of smell in insects such as flies?
• How can bacteria survive our stomach acid and still make us sick?
• Why are equatorial seas lacking in iron?
• How can you add a particular atom to a specific site on a molecule, and not a different site on that molecule?
• Are theropods more related to the Ornithischians or they are more related to Sauropods?
• How did we figure reference temperatures out?
• Why can you dissolve more in a warmer solvent? And why is that the case?
• Are the lagrange points of [for example] earth and sun being displaced by other planets?
• Why does Nile river flow from south to north?
• Is the intermolecular forces between molecules constant ?
• If you were to boil water in a low pressure area making the boiling point less than 100*c, would you still kill the germs?
• How are viruses kept alive in the lab?
• [chemistry] Activated charcoal is good for capturing adulterants from the air and other mediums. Is it possible to reverse this process and determine from activated charcoal what has been captured and in what ratio?

In an absolute vacuum, does the diameter of a laser beam change over distance? Posted: 25 Oct 2019 06:54 PM PDT How collimated is laser? Is there a spread over distance? submitted by /u/OculoDoc [link] [comments]

This may sound dumb, but what makes glass shatter, and not split or crack in half? Posted: 26 Oct 2019 03:54 AM PDT I know glass shatters, but what is the scientific process of shattering instead of cracking or splitting? submitted by /u/Angejo [link] [comments]

How do veins and arteries bend/twist without blood getting stopped or clogged? Posted: 25 Oct 2019 04:19 PM PDT When a water hose is bent far enough, the flow of water through it is choked and very little water comes out. When we bend our arms or move our legs, shouldnt the same thing happen? submitted by /u/ItsClaii [link] [comments]

What exactly is Google's "quantum supremacy" and is this as big of a milestone as they make it out to be? Posted: 25 Oct 2019 10:50 PM PDT Their video spends a lot of time explaining the basics of quantum computing, but seems rather light on technical details of what they've actually accomplished. What problem does their quantum computer calculate? I assume it's not something interesting like Shor's algorithm, or else they'd be headlining with that. submitted by /u/currentscurrents [link] [comments]

How can white light have a continuous spectrum without having infinite energy? Posted: 25 Oct 2019 10:06 AM PDT If white light has a continuous spectrum, then it has an infinite quantity of frequencies as there are an infinite quantity of numbers between any two numbers. (It shouldn't matter that light usually has discontinuities. if it has any continuous regions, this should hold true.) For example, if I have light between 508 and 508.1 THz, I have frequencies that include 508.01, 508.011, 508.0111, etc. and that is only a small subset of the actual range of frequencies. Every single frequency should have a photon with energy equal to Plank's constant times its frequency. So, the minimum energy of a photon in the example range is 3.3660436362×10−19 J. That times infinity is, of course, infinity. Given that white light obviously does not have an infinite amount of energy, how can it possibly have a continuous spectrum? submitted by /u/Downer_Guy [link] [comments]

How many Antigen Receptors are on Helper T cells? Posted: 25 Oct 2019 07:37 PM PDT If helper T cells have antigen receptors that bind to specific antigens presented on MHC complexes by a macrophage, are there numerous antigen receptors on each helper T cell? Or are there clonal lines of helper t cells with unique antigen receptors? If this is true, do these clonal lines gather in specific locations in the body to best be "placed" for the specific pathogen? submitted by /u/UpstateBioTeacher [link] [comments]

Helper T Cells and the activation of B and Cytotoxic T Cells? Posted: 25 Oct 2019 07:27 PM PDT When a helper T cell is activated does it always activate both a humoral (B cell) and cell mediated (cytotoxic T cells) response? Do some pathogens elicit only one or a greater percentage of one? If so, does this depend on the specific pathogen? submitted by /u/UpstateBioTeacher [link] [comments]

Why are some languages (Kanji and Traditional Chinese, for example) written as "pictures", so to speak, and western languages are based more on syllable structures? Is there a historical reason for it? Posted: 25 Oct 2019 03:03 AM PDT Why have some languages evolved to be picture languages, whereas western languages are usually based on syllables? It can't be random. There's got to be a certain historical reason for it. I'm sorry if the term "picture" language is incorrect, I tried to think of a better way to describe Kanji/Trad. Chinese and this is the best I came up with. :/ submitted by /u/hotzenploty [link] [comments]

How good is the sense of smell in insects such as flies? Posted: 25 Oct 2019 07:59 AM PDT submitted by /u/hippovomit [link] [comments]

How can bacteria survive our stomach acid and still make us sick? Posted: 25 Oct 2019 04:06 AM PDT submitted by /u/MrPopper69 [link] [comments]

Why are equatorial seas lacking in iron? Posted: 25 Oct 2019 08:51 AM PDT submitted by /u/weak_wordplay [link] [comments]

How can you add a particular atom to a specific site on a molecule, and not a different site on that molecule? Posted: 25 Oct 2019 02:19 AM PDT Hi all, I was wondering how, when designing chemical substances, scientists are able to add a specific atom to an exact location on a molecule, rather than a different location? So for example, if you had a molecule containing a few nitrogen atoms which were available to bind to something new, but you wanted to add an oxygen atom to only one specific nitrogen of your choice. How would you do it? Can you even do it? Any advice or perhaps any relevant links to explain this would be appreciated! Thanks everyone! submitted by /u/Meinpooper [link] [comments]

Are theropods more related to the Ornithischians or they are more related to Sauropods? Posted: 25 Oct 2019 02:42 AM PDT Are theropods more related to the Ornithischians or they are more related to Sauropods? I mean is Ornithoscelida theory right or wrong? submitted by /u/dooms_day_clock [link] [comments]

How did we figure reference temperatures out? Posted: 25 Oct 2019 05:34 AM PDT One of the ways to check for the purity of a substance is to boil/melt and check against the expected value,but how do we know the reference in the first place? How do we know that water boils at 100 degrees so we can use it as a reference for tests? submitted by /u/Lemonioneater [link] [comments]

Why can you dissolve more in a warmer solvent? And why is that the case? Posted: 24 Oct 2019 11:40 PM PDT So, its about compound A getting dissolved in solution B. You insert so much of compound A into solution B until B gets saturated. If you insert more, then it gets oversaturated and A will just sink into the bottom of B (assuming B is in a cup or something). If you heat up this oversaturated solution B, A will start to dissolve in it, such that there is no solid inside of B. If I looked it up correctly, this is the case because the molecules of B move faster and create more space for A to settle in. Which physical/chemical rule is this? Why do you get more space when the molecules move faster? submitted by /u/Na50r [link] [comments]

Are the lagrange points of [for example] earth and sun being displaced by other planets? Posted: 25 Oct 2019 03:15 AM PDT And if so how big is the displacement compared to the model from wikipedia? submitted by /u/Pomada1 [link] [comments]

Why does Nile river flow from south to north? Posted: 25 Oct 2019 04:36 PM PDT submitted by /u/moussafayyad [link] [comments]

Is the intermolecular forces between molecules constant ? Posted: 24 Oct 2019 09:28 PM PDT Hi all, I understand that the strength of intermolecular forces between the molecules are depended on the state of matter which it is in. However, my question is,is there a quantifiable value of the "strength" of these forces. I also understand that to move from a state of matter to another, these bonds must be broken. By adding pressure or temperature to it the enviroment it is it, we are manipulating the variables around the physical property. Love to get some discussion going. submitted by /u/Crirun [link] [comments]

If you were to boil water in a low pressure area making the boiling point less than 100*c, would you still kill the germs? Posted: 24 Oct 2019 09:54 PM PDT submitted by /u/Stressed_robot [link] [comments]

How are viruses kept alive in the lab? Posted: 24 Oct 2019 08:32 PM PDT How are viruses like smallpox and the polio strains kept alive/active in the lab? Do they even need to be functioning to be useful? submitted by /u/davesoverhere [link] [comments]

[chemistry] Activated charcoal is good for capturing adulterants from the air and other mediums. Is it possible to reverse this process and determine from activated charcoal what has been captured and in what ratio? Posted: 24 Oct 2019 08:56 PM PDT Hopefully I got the terminology right with the question. As I understand it activated charcoal is good for capturing adulterants from the air and other mediums. Is it possible to reverse this process and determine from activated charcoal what has been captured and in what ratio? submitted by /u/enoughstupidmemes [link] [comments]

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Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States

AskScience AMA Series: We mapped human transformation of Earth over the past 10,000 years and the results will surprise you! Ask us anything!

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• AskScience AMA Series: We mapped human transformation of Earth over the past 10,000 years and the results will surprise you! Ask us anything!
• Why isn't the James Webb space telescope heat shield made out of gold?
• Since in nuclear fission a very small amount of matter is converted to energy, is it Theoretically possible to create matter from energy and have we done this?
• How do population III stars fit into reionization, and how are they different from modern stars?
• Why can we still see the cosmic microwave background radiation? If it travels at the speed of light shouldn't that radiation have already passed us and that part of the sky be dark now?
• We know human body is quite full of water (~2/3) but is that ratio above average among other animals? And which animals have the most and least amount of water in their body compared to their size?
• How do blood cells get oxygen?
• Why were the first laser pointers red?
• Do we still get vitamin D from sunlights that’s passed through a window/glass?
• Why is the expansion of the universe attributed to dark matter and not just momentum from The Big Bang?
• Immunological memory exists so that our immune system can mount a proper immune response to a previously encountered antigen. Do we have a memory system for non-antigens?
• What role (if any) does heat play in general relativity?
• What does a spider’s field of view look like?
• Why should a comet have a “tail” at all? There’s no air friction. What’s making it break apart??
• Why are computers so slow at switching displays?

AskScience AMA Series: We mapped human transformation of Earth over the past 10,000 years and the results will surprise you! Ask us anything! Posted: 25 Oct 2019 04:00 AM PDT When did humans first begin transforming this planet? Our recent article in Science brings together more than 250 archaeologists to weigh in on this. By mapping human use of land over the past 10,000 years, we show that human transformation of Earth began much earlier than previously recognized, deepening scientific understanding of the Anthropocene, the age of humans. We're here to answer your questions about this 10,000-year history and how we mapped it. Archaeological assessment reveals Earth's early transformation through land use (Science) Humans Dominated Earth Earlier Than Previously Thought (The New York Times) UMBC's Erle Ellis crowdsources global archaeological research to trace the history of human impacts on Earth (UMBC News) When did humans start to transform Earth? UMBC's Erle Ellis introduces the Anthropocene (UMBC News) On the AMA today are: Erle Ellis, professor of geography and environmental systems, at the University of Maryland, Baltimore County Lucas Stephens, senior research analyst at the Environmental Law & Policy Center and former UMBC post-doctoral fellow We are on at 1 p.m. (ET, 17 UT), ask us anything! submitted by /u/AskScienceModerator [link] [comments]

Why isn't the James Webb space telescope heat shield made out of gold? Posted: 24 Oct 2019 08:12 AM PDT The mirrors are made out of gold because it is the best reflector of infrared light. So why wouldn't the heat shield also be made out of the best reflector of infrared light? submitted by /u/i_am_archimedes [link] [comments]

Since in nuclear fission a very small amount of matter is converted to energy, is it Theoretically possible to create matter from energy and have we done this? Posted: 24 Oct 2019 07:39 PM PDT submitted by /u/YaboiGumby [link] [comments]

How do population III stars fit into reionization, and how are they different from modern stars? Posted: 24 Oct 2019 07:05 PM PDT Before going into the question more, I understand that Pop III stars form in neutral, metal-free gas. What I am confused about is how this makes them different than other stars. For example, why are they capable of being so much more massive than Pop I stars? Also, during formation, is it a special case in Pop III stars that their accretion disks seem to fragment, or is this common among all protostellar systems? If this is exclusive to Pop III stars, why is that? Finally, I'm confused about how exactly they fit into the era of reionization. I understand that the light emitted from these stars will ionize the surrounding gas, but once the stars dies, does the gas not just become neutral again? How does this process begin the reionization of the universe as a whole? submitted by /u/KirsnickBall [link] [comments]

Why can we still see the cosmic microwave background radiation? If it travels at the speed of light shouldn't that radiation have already passed us and that part of the sky be dark now? Posted: 24 Oct 2019 05:06 PM PDT submitted by /u/superOOk [link] [comments]

We know human body is quite full of water (~2/3) but is that ratio above average among other animals? And which animals have the most and least amount of water in their body compared to their size? Posted: 24 Oct 2019 01:39 PM PDT The title. submitted by /u/goofXyod [link] [comments]

How do blood cells get oxygen? Posted: 24 Oct 2019 04:56 PM PDT I'm going over the circulatory system for a class and was curious about how blood cells get the oxygen they need to survive. Does the oxygen they require simply diffuse into the cells when they pass through the pulmonary loop as they pick up oxygen for transport? submitted by /u/Champi0n_Of_The_Sun [link] [comments]

Why were the first laser pointers red? Posted: 24 Oct 2019 12:08 PM PDT Why were the first laser pointers red and why today do they only make lazer pointers in red, green, and violet. Which also happen to be end middle end of the visible light spectrum. submitted by /u/lewknight [link] [comments]

Do we still get vitamin D from sunlights that’s passed through a window/glass? Posted: 24 Oct 2019 05:46 AM PDT submitted by /u/XxPINEAPPLExX04 [link] [comments]

Why is the expansion of the universe attributed to dark matter and not just momentum from The Big Bang? Posted: 24 Oct 2019 05:16 AM PDT Is it just because of the increasing acceleration? submitted by /u/Mufasaah [link] [comments]

Immunological memory exists so that our immune system can mount a proper immune response to a previously encountered antigen. Do we have a memory system for non-antigens? Posted: 24 Oct 2019 10:13 AM PDT For example, let's say it's spring time and there is much pollen in the air. Does the immune system bind to the pollen molecules and determine it is a non-antigen every single time it encounters it, or does it mark the pollen as a non-antigen for the future? The reason I ask this is that common allergies are caused by our immune system improperly acting upon a non-antigen (they treat something like pollen as something dangerous, when it really isn't). Let's say there's a 1% chance that our body develops an allergic reaction to pollen; that means after 100 exposures it is likely that a person develops some sort of response, unless the body has determined it to be a non-antigen and can recognize it so! Is this something that happens in the body, or do we only have a memory for antigens? submitted by /u/doctorinsecto [link] [comments]

What role (if any) does heat play in general relativity? Posted: 24 Oct 2019 03:58 PM PDT At absolute zero, molecular movement (basically) stops. Does that mean time stops for the subject molecules as well? Is temperature (or some other more direct attribute) captured as a variable in relativistic equations? submitted by /u/Kemilio [link] [comments]

What does a spider’s field of view look like? Posted: 23 Oct 2019 09:18 PM PDT I've seen pictures of spiders having eyes on parts of their heads where it looks as if a fluid and connected image would not be possible. Do they see similar to say, a security set up where there are different points of view? Or does the image present itself like one very wide angled picture? Thanks! submitted by /u/5259283 [link] [comments]

Why should a comet have a “tail” at all? There’s no air friction. What’s making it break apart?? Posted: 23 Oct 2019 06:57 PM PDT submitted by /u/paste_rand_name [link] [comments]

Why are computers so slow at switching displays? Posted: 23 Oct 2019 06:48 PM PDT While nearly every task on computers has gotten quicker and quicker, plugging into a display even on my new MacBook Pro, causes the computer to spaz out for a solid 30 seconds with windows slowly resizing, jumping around, etc., until eventually settling down and functioning normally. Why does this process take so long, and why has it seemingly not benefited from vast improvements to bus speeds, processor speeds, etc.? submitted by /u/holysitkit [link] [comments]

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Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States

How is it that we know the shapes of the continents from hundreds of millions of years ago?

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• How is it that we know the shapes of the continents from hundreds of millions of years ago?
• Does makeup get absorbed into skin/bloodstream?
• Why/how do fallen leaves stain the sidewalk during autumn?
• What geological event would cause this land formation?
• Why do Diet/Zero drinks always have sodium?
• Can a pathogen be non biological?
• How does breathing work?
• How wide is the "space" that things can orbit earth?
• Where do Astronaut's get their oxygen from in space?
• Why does growing meat add more carbon to the air than plants do?
• How do geese decide where in the v to fly?
• Can inaudible sounds damage our hearing?
• How does Carbamide Peroxide work to whiten teeth?

How is it that we know the shapes of the continents from hundreds of millions of years ago? Posted: 23 Oct 2019 12:10 PM PDT submitted by /u/BoumStick [link] [comments]

Does makeup get absorbed into skin/bloodstream? Posted: 23 Oct 2019 12:02 PM PDT Does cosmetics, makeup, anything you put on your skin or hair (including shampoo, condition, lotion, etc) get absorbed into your bloodstream? Is there any concrete proof that it occurs? submitted by /u/draagoonf [link] [comments]

Why/how do fallen leaves stain the sidewalk during autumn? Posted: 23 Oct 2019 04:27 PM PDT submitted by /u/hautemilf [link] [comments]

What geological event would cause this land formation? Posted: 23 Oct 2019 12:02 PM PDT https://imgur.com/gallery/u2WXcyC To me, it looks like an old volcano blew and spilled magma out, whatever it is, it looks really cool. I'm having trouble googling an answer. submitted by /u/you_cant_ban_me_fool [link] [comments]

Why do Diet/Zero drinks always have sodium? Posted: 23 Oct 2019 01:54 PM PDT Everytime I see a drink that is promoted as being diet or zero calorie, it has zero grams of everything except for sodium. Why is sodium the only piece of nutrition in these drinks? submitted by /u/RedWolf807 [link] [comments]

Can a pathogen be non biological? Posted: 23 Oct 2019 11:56 AM PDT Ok so my immunology professor said "pathogens are only micro organism and hypoxia or any non biological can't be a pathogen" But the other day my pathology prof said "anything that can cause harm to a cell is a pathogen" he also argued that the name itself validate what he said So i went and checked my text book and it didn't really helped cause it kept saying biological pathogens which we can conclude there is a non biological kind aswell If u know the answer pls tell me and mention a reference thank you Also my English is not so good im sorry if i made too many mistakes submitted by /u/kssalso [link] [comments]

How does breathing work? Posted: 23 Oct 2019 11:18 AM PDT Like how does our respiratory system bring the air in? submitted by /u/Ethanol6565 [link] [comments]

How wide is the "space" that things can orbit earth? Posted: 23 Oct 2019 08:21 AM PDT Like for example, a space station. Is there a specific zone a certain distance from Earth it needs to stay to maintain orbit? Or is it a single specific distance? submitted by /u/DoctorWhoniverse [link] [comments]

Where do Astronaut's get their oxygen from in space? Posted: 23 Oct 2019 07:24 AM PDT submitted by /u/Evgeniy66 [link] [comments]

Why does growing meat add more carbon to the air than plants do? Posted: 23 Oct 2019 05:37 AM PDT Now I understand that at the surface this seems kind of dumb. Cow has to eat plants and is breathing, which adds carbon it's entire life, then gets given to us, instead of plants that absorb carbon that are fed to us. Simple. But then I was thinking. Wouldn't this process be carbon neutral regardless of whether we eat plants or meat? In the case of plant, it's a shorter path. Plant absorbs carbon and stores it in mostly carbohydrates. So it's basically taken water, sunlight, and carbon dioxide and used that to store energy in the form of some compounds with carbon, hydrogen, and maybe oxygen (not too sure on the chemistry here, but definitely carbon and hydrogen are there.) Gives off some oxygen in the process. Now we eat these molecules, take oxygen, basically combust the molecules and get water, carbon dioxide, and energy as a result. So, carbon from air goes into plant, comes out of our lungs. No carbon was pulled from Earth, no new carbon added to atmosphere. Carbon neutral process. Now with meat, the cow does the same thing we did. Of course it stores some of that carbon in fat and proteins, but again, all of the carbon it is comprised of came from the air. Nobody is digging up oil and feeding it to the cow. Then we eat the cow, releasing some of the carbon it didn't. This process is just less efficient, sure, but in my mind still carbon neutral. Now there is the methane farts of these cows. But methane is again some carbon and hydrogen. So some bacteria are getting fed too. Yet we still hear that meat is much worse for climate change than plants. I don't think this is a false statement yet, but is this simply a logistics issue? As in, the land required to grow the plants came from a forest, the transportation needed, and so on? I want to understand where the new carbon (by this I mean carbon that wasn't in the atmosphere in the last few centuries) is coming into play. Thanks in advance for the answers :) submitted by /u/psidud [link] [comments]

How do geese decide where in the v to fly? Posted: 23 Oct 2019 04:19 AM PDT By chance I was under a v of geese long enough on the morning commute (not driving btw) to wach a pair at the back of the v change position with eachother. I was wondering how they choose their position or qhen they know to switch for that matter. submitted by /u/yeroc_sema [link] [comments]

Can inaudible sounds damage our hearing? Posted: 22 Oct 2019 07:13 PM PDT submitted by /u/someonenotmi [link] [comments]

How does Carbamide Peroxide work to whiten teeth? Posted: 22 Oct 2019 03:38 PM PDT Hi, I understand a few basics but I have further questions I was hoping someone could answer: 1) As I understand, CP breaks down to Hydrogen Peroxide. I read online that CP works for 'longer' and continues to whiten your teeth for many hours after application. How exactly does this work? Is the CP absorbed into your teeth and continue the bleaching process even after you brush your teeth? 2) Why does CP work longer than HP? 3) Can someone provide some solid reasoning to support or deny the claim that LEDs are effective in teeth whitening? Is the LED supposed to activate the CP faster or simply dry out your teeth so that CP can work faster without interference from your saliva? 4) How much CP at 44% needs to be applied, how often, and for how long for beat results? 5) I have read that CP/HP essentially removes a very thin layer of enamel each time you apply it and leave it on. Does this essentially mean that if you continue to apply it, eventually it will remove enough enamel to become harmful/dangerous? Does CP whiten your teeth by actually penetrating your teeth and bleaching the inside, or by removing a thin layer (this essentially only removing surface stains), or both? Thank you! submitted by /u/dudemanbrofriend [link] [comments]

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