Why does putting a leaf between pages of a firmly closed book prevent the leaf from decaying?

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• Why does putting a leaf between pages of a firmly closed book prevent the leaf from decaying?
• What actually makes something move along a concentration gradient?
• How does NASA's rovers communicates with NASA?
• if skin cells are constantly regenerating, why do tattoos last forever?
• Does a Caterpillar keep its memories as it transitions into a butterfly?
• Why was India such a speedster ? The Indian continental plate moved at speeds of upto 15 cm/6 inches per year for 30 million years as it broke away from Gondwana and Madagascar and moved to Asia (about twice as fast as continental drift nowadays)
• When a stroke or brain damage causes a person to have to re-learn language, how does the brain typically adapt? Do the damaged parts recover or do other parts of the brain take over, and how does this affect the relearning process?
• Why do sunscreens expire?
• What is the importance of a Black Hole in our Universe and how reasonable is this theory?
• Why does one’s face look puffy when you first wake up?
• If a poor conductor of heat and a good conductor of heat of different temperatures were placed on top of each other, would the rate of heat transfer be fast or slow?
• If body temperature is 98.6°F, why do I feel hot in air that is significantly cooler than that?
• How can Sharks smell blood up to a mile away?
• When Pangaea finally "broke apart", was it a sudden cataclysmic event which sundered the super-continent, or a series of small sequential changes that caused each "continent" to break off and form over a much longer period of time?
• Why does milk taste fine for several weeks but then spoil all at once?
• Can a submarine go into space/does a spaceship need to survive ocean dephs to be spaceworthy?
• So women generally live longer than men. Do the females of different species generally live longer than males?
• How does the immortal jellyfish account for telomere shortening, is the process of transfifferentiation effective in countering this or do they still degrade normally?
• For people with two hearts such as conjoined twins, how does regulating heart rate and blood pressure work?
• Can a fever cause heat stroke?
• When a solid is broken, why don't the atoms re-bond when pressed back together?
• How do our brains keep track of time?
• How hot can something get just from receiving sunlight? Does it have a limit? (Think of something left in the car directly exposed to sunlight) Does it change if something is exposed to the sun in a vacuum where it can’t dissipate heat as easily?
• How fast does a change in pressure travel through pipe?

Why does putting a leaf between pages of a firmly closed book prevent the leaf from decaying? Posted: 05 Aug 2019 09:29 AM PDT submitted by /u/Eudonidano [link] [comments]

What actually makes something move along a concentration gradient? Posted: 06 Aug 2019 03:24 AM PDT Is this something to do with the probabilities of particle paths, or do particles have some property which I don't know about? submitted by /u/theaadi_ [link] [comments]

How does NASA's rovers communicates with NASA? Posted: 06 Aug 2019 07:23 AM PDT submitted by /u/r3Bq [link] [comments]

if skin cells are constantly regenerating, why do tattoos last forever? Posted: 05 Aug 2019 06:32 PM PDT submitted by /u/Iamanugget42 [link] [comments]

Does a Caterpillar keep its memories as it transitions into a butterfly? Posted: 05 Aug 2019 03:27 PM PDT https://www.scientificamerican.com/article/caterpillar-butterfly-metamorphosis-explainer/ Seeing as Caterpillars melt there whole body except for these imaginary disks, does that mean that there brain melts and transforms into a new brain? submitted by /u/Deadus [link] [comments]

Why was India such a speedster ? The Indian continental plate moved at speeds of upto 15 cm/6 inches per year for 30 million years as it broke away from Gondwana and Madagascar and moved to Asia (about twice as fast as continental drift nowadays) Posted: 06 Aug 2019 03:32 AM PDT So, as I understand it, the magma plume that broke India up from Gondwana/Madagascar, heated up the bottom of the continental plate so that it was very thin and did not have deep roots into the lithosphere. This includes Reunion hotspot under India during the Deccan Trap volcanic period (~= end of dinosaurs) But this paper says that it only explains 5 million years of speeding, and that dual subduction/breaking up of oceanic plate north of India is responsible http://news.mit.edu/2015/india-drift-eurasia-0504 While as best as I can make out, Wiki says the dual subduction isn't borne out by paleomagnetic data from southern tibet. https://en.wikipedia.org/wiki/Indian_Plate#Plate_movements https://linkinghub.elsevier.com/retrieve/pii/S1367912019300161 Is the full speeding explanation still a mystery , waiting for someone to solve it (and presumably get an award) ? Or did I misunderstand the articles and the story ? Or has someone actually explained it all. ? submitted by /u/barath_s [link] [comments]

When a stroke or brain damage causes a person to have to re-learn language, how does the brain typically adapt? Do the damaged parts recover or do other parts of the brain take over, and how does this affect the relearning process? Posted: 05 Aug 2019 10:57 AM PDT submitted by /u/Redpike136 [link] [comments]

Why do sunscreens expire? Posted: 06 Aug 2019 06:54 AM PDT I would like to understand if it is because of microbial contamination or if the UV-blocking agents are degraded. If the latter is the case... how? Sunscreens are light-protected in their recipients and not usually exposed to high temperatures. Also, do sunscreens lose 100% of the effect at the expiration date, or do they just lose partial effect (e.g. 75% of effectivity after 1 year, 50% after 2 years,...)? submitted by /u/RelaxedSquid [link] [comments]

What is the importance of a Black Hole in our Universe and how reasonable is this theory? Posted: 06 Aug 2019 12:48 AM PDT Having just stumbled upon the first ever actual photo of a Black Hole it got me thinking. I don't have any background in Science whatsoever, so forgive me if this is purely just rambling, but I find this discovery to be extremely fascinating. Here are some things I gathered: From the Michio Kaku's CBSN interview ( https://www.youtube.com/watch?v=Hq6jkRrdDKI ) he states that the black hole is being studied in the center of the Milky Way galaxy in the Sagittarius constellation. He then explains that the moon orbits the Earth, the Earth orbits the Sun, and the Sun orbits a black hole. This makes sense, but isnt something I was ever taught in school. That basically means that anything with a higher mass is the center and other things of lesser mass will orbit around it. This tells me that, in our solar system the Sun has the highest mass. Thus the planets orbit around it, and smaller objects orbit around the planets (Gas, Moons, Comets, etc). Obviously, the difference in mass to create an "orbit" must be enormous. Jupiter, for instance, the largest planet in our solar system has the mass of 0.001 Suns. Purely bullshitting here and spewing out numbers. But theoretically lets assume for our Sun to orbit something, that something would have to hold a similar mass differential as the Sun-Jupiter size difference. Meaning our Sun (theoretically) orbits a black hole while having 0.001 of its mass. Expanding on this, is it not safe to assume that everything in the universe is put into "orbit" or rather is attracted to mass, or rather "space gravity"? By this logic, the object at center of the universe would contain the most "space pull" in that time. Earth rotates around the Sun, our Sun and everything that is tethered to it (solar system) rotates around the largest "space pull" point in our Galaxy (Sagittarius A, black hole), SagA rotates around the largest "space pull" point in a Galaxy cluster, and whatever that abysmally massive thing is (an unfathomably massive black hole perhaps?) that keeps the galaxy clusters in rotation would rotate around whatever that has the most "space pull" in the entire universe? And because everything is centered in on that one point in the universe is it not safe to say that would have created the universe? Also another thought I had, after watching the press release where they explained that on the accretion disc there are gasses that are caught in the rotation of the black hole just outside the event horizon that are traveling so fast and in a condensed manner that they heat up extremely fast due to the friction of them hitting each other. It got me thinking, after a thousand years or maybe a couple of million, what would happen if this process continued? Wouldn't there be enough "trapped gasses" at extreme temperatures to coat the black hole that it gets completely covered by it? Wouldn't the gasses eventually overpower the black hole and starve it and could it not eventually transform itself to a big ball of extremely hot gasses, shrouding the black hole inside it much like... our Sun (Stars)? Science is amazing, thanks for reading until the end. tl;dr: Does the entire Universe rotate around a single entity that contains the most mass in a given "space time"? Could a black hole evolve into a Star after enough time has passed via the gasses it traps in the accretion disc? submitted by /u/_Rust [link] [comments]

Why does one’s face look puffy when you first wake up? Posted: 05 Aug 2019 08:08 PM PDT submitted by /u/RyanRebalkin [link] [comments]

If a poor conductor of heat and a good conductor of heat of different temperatures were placed on top of each other, would the rate of heat transfer be fast or slow? Posted: 05 Aug 2019 11:33 PM PDT submitted by /u/RTXChungusTi [link] [comments]

If body temperature is 98.6°F, why do I feel hot in air that is significantly cooler than that? Posted: 05 Aug 2019 01:55 PM PDT submitted by /u/Sp00kyNoodle [link] [comments]

How can Sharks smell blood up to a mile away? Posted: 05 Aug 2019 02:27 PM PDT Considering that olfactory receptors require blood in order to smell it, how is it that sharks can smell blood from a mile away? Does blood traverse quickly through saltwater, or is it a myth? submitted by /u/LysanderTheGreat [link] [comments]

When Pangaea finally "broke apart", was it a sudden cataclysmic event which sundered the super-continent, or a series of small sequential changes that caused each "continent" to break off and form over a much longer period of time? Posted: 05 Aug 2019 04:24 PM PDT Incidentally enough this question comes after watching the animated film "The Croods" wherein it seems to be implied that Pangaea breaking apart is the cause of their core strife in the climax of the film. So I began to wonder, was the forming of our modern continents the result of a single catastrophic event wherein Pangaea split apart in multiple places, or did it break apart in segments over a much larger period of time? submitted by /u/Big-Bad-Woulfe [link] [comments]

Why does milk taste fine for several weeks but then spoil all at once? Posted: 05 Aug 2019 12:40 PM PDT submitted by /u/sevenevans [link] [comments]

Can a submarine go into space/does a spaceship need to survive ocean dephs to be spaceworthy? Posted: 05 Aug 2019 08:46 PM PDT submitted by /u/Operator-in-training [link] [comments]

So women generally live longer than men. Do the females of different species generally live longer than males? Posted: 05 Aug 2019 03:35 PM PDT submitted by /u/RockLeePower [link] [comments]

How does the immortal jellyfish account for telomere shortening, is the process of transfifferentiation effective in countering this or do they still degrade normally? Posted: 05 Aug 2019 01:34 PM PDT submitted by /u/Flyron-Fist [link] [comments]

For people with two hearts such as conjoined twins, how does regulating heart rate and blood pressure work? Posted: 05 Aug 2019 11:49 PM PDT They had a thing on BBC about conjoined twins where one had a bad heart and the other one had a healthy heart and essentially if they were to separate them the one with the bad heart would die. So that go me thinking, the one with the healthy heart must be helping the one with the bad heart somehow via a shared circulatory system but how would that work? How would they sync blood pressure and heart rate, shouldn't that cause problems? submitted by /u/Cetun [link] [comments]

Can a fever cause heat stroke? Posted: 05 Aug 2019 11:16 PM PDT I know that heat stroke can cause a fever but does it work the other way around? From my knowledge, your body temperature when you have a fever is greater than 100.4 F and for a heat stroke it is at 104 F. In the case you had a fever of 104 F does this place you're able to get a heat stroke? I know that your body is able to regulate temp by making you think your cold when you have a fever, but does this also play a role? Thanks for the responses! submitted by /u/Vrester [link] [comments]

When a solid is broken, why don't the atoms re-bond when pressed back together? Posted: 05 Aug 2019 01:27 PM PDT Say you have a gold brick. I get that this is basically a mesh of many atoms, all of which have the same amount of protons, neutrons, etc, and that these atoms all bond with each other. Now say you split it cleanly in half. If you press it back together, what is stopping the atoms from re-bonding back to the original state? submitted by /u/-endjamin- [link] [comments]

How do our brains keep track of time? Posted: 05 Aug 2019 10:01 AM PDT I know a lot of electronic clocks keep track of time by counting the vibrations of a quartz crystal to keep track of time, but how do our brains do it? As far as I know they don't have anything like that where's it always vibrates at a constant rate,so how does our brain keep track of time so that we know consciously about how much time has passed, and also so things like our heat rate stay at a consistent pace? submitted by /u/wabahoo_on_you [link] [comments]

How hot can something get just from receiving sunlight? Does it have a limit? (Think of something left in the car directly exposed to sunlight) Does it change if something is exposed to the sun in a vacuum where it can’t dissipate heat as easily? Posted: 05 Aug 2019 12:42 PM PDT submitted by /u/eldiego92999 [link] [comments]

How fast does a change in pressure travel through pipe? Posted: 05 Aug 2019 08:55 AM PDT My intuition equates sound with pressure and so it would seem that a pressure change would approximate the speed of sound. I've searched this sub and read a bit about Bernoulli's principle but I feel no more informed. Edit: what got me thinking about this is the fact that a change in temperature or anything else about a liquid flowing through the pipe goes at whatever speed (roughly) the liquid flows. But a change in pressure is "instant". It isn't literally instant so how fast is it? Presumably it depends on the material of the pipe and the fluid but ... you get the idea. submitted by /u/breddy [link] [comments]

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