If climate change is a serious threat and sea levels are going to rise or are rising, why don’t we see real-estate prices drastically decreasing around coastal areas? |
- If climate change is a serious threat and sea levels are going to rise or are rising, why don’t we see real-estate prices drastically decreasing around coastal areas?
- Why do statistics behave differently when identical particles are involved?
- How does maintaing methane levels influence global heating?
- Why Do Drugs like Losartan and other ARB's take weeks to have full effect?
- Why can you crumble paper but not fabric?
- Eye lense - help me understand?
- How exactly is memory stored in our brain?
- Do live vaccines grown in human embryos have the potential to affect our DNA?
- How do we know that earth isn't inside of a nebula?
- How does spontaneous symmetry breaking explain the Higgs field?
- How does the stomach replenish loss of acid?
- How do the center of planets/stars behave?
- Why are is blood delivered so slowly during a transfusion?
- How Do The Electronics Of LCD/OLED Displays Work?
- Do metal liquids (i.e. mercury), seep through materials (paper, fabric) like water would?
| Posted: 22 Oct 2019 05:20 AM PDT |
| Why do statistics behave differently when identical particles are involved? Posted: 22 Oct 2019 08:02 AM PDT I'm borrowing the example from this wikipedia article. Let's say I have two indistinguishable bosons, each of which can exist in two states, |0> and |1>. If I put the two particles together in a noisy environment, let them evolve for some time, and then measure their states, I have a 33% probability each of measuring |00>, |01>, or |11>. This makes sense on some level --- the combined system had three possible states, all of the same energy, and a uniform distribution over those states maximizes entropy. Obviously, this doesn't generalize to normal macroscopic systems. If I put two coins in a cup, shake them for a while, and observe their state, I would expect to find two heads with 25% probability, two tails with 25% probability, and 1 heads and one tails with 50% probability. Of course, macroscopic coins are not indistinguishable, but where exactly does indistinguishably change the statistics so fundamentally? Is it at the time of observation? If I observed the state with a sufficiently low-resolution camera, that could resolve heads and tails, but not distinguish the two coins by any markings, would my observations mimic the quantum-mechanical case? Or is the indistinguishably important while the coins/particles are time-evolving in a noisy environment? Of course, I know that quantum mechanics are inherently counter-intuitive, and I shouldn't expect my normal intuitions to apply. However, the classical behavior should be a limiting case of the quantum-mechanical behavior, and I don't see where the boundaries between the classical and quantum-mechanical behavior lies. In principle, could one construct two atom-for-atom identical coins, put them in Schrödinger's box, shake it, and expect two heads with 33% probability? [link] [comments]  |
| How does maintaing methane levels influence global heating? Posted: 22 Oct 2019 04:19 AM PDT I best explain. First of all I am a scientist myself, though is slightly outside my comfort zone. I'm hoping a greenhouse gas specialist could answer. Methane breaksdown over 8-10 years. So lets say that every year we produce exactly the same amount of methane, we get to a state where the methane is being put into the atmosphere at the same rate by which it is breaking down (let's forget about CO2 and other GHGs for now). If atmoshpheric methane remains constant, will it maintain the current temperatue (pre-industrial +1.5c)? or will it continually have a warming effect, pushing up global temperatures. To word it a different away: Is the impact of methane in the atmosphere mainly from the simple abundance of it. Or is it the abundance of it multiplied by it's time present. I appreciate it is a bit more nuanced that I am making it, but I hope my question comes across. Please ask if I am not being clear enough. [link] [comments]  |
| Why Do Drugs like Losartan and other ARB's take weeks to have full effect? Posted: 22 Oct 2019 06:20 AM PDT The manuals for Losartan says that while the initial dose will be in effect in 4-6 hours after ingestion, the full effect of the drug will take a few weeks. Why is that? [link] [comments]  |
| Why can you crumble paper but not fabric? Posted: 22 Oct 2019 06:48 AM PDT When you fold or crumple paper it stays this way and it is really hard to get rid of the folding lines (if even possible). If you try the same with fabric it does not work and you cannot tell whether a piece of fabric has been folded before or not. Why is that? Edit: I misspelled crumple in the title but cannot change it. So the question is about crumpling and not crumbling. [link] [comments]  |
| Eye lense - help me understand? Posted: 22 Oct 2019 04:29 AM PDT With reference to the lense in an eye. Why do they say that when the lense is round (versus flat) that the cilliary muscle is relaxed and the syspensory ligament is TIGHT? Surely the cillary muscle becomes longer when relaxed (versus short) when it's contracted? So that extra length in the muscle should allow the ligament (which is not elastic) to be SLACK( not tight)? [link] [comments]  |
| How exactly is memory stored in our brain? Posted: 21 Oct 2019 11:41 AM PDT I mean like I know it is stored in specific areas of the brain but at the molecular level,how does it "stay"? [link] [comments]  |
| Do live vaccines grown in human embryos have the potential to affect our DNA? Posted: 21 Oct 2019 03:05 PM PDT So I had this anti vaxer in my class bring up that certain live vaccines are propagated in human embryos and that if the embryo has a predisposition to cancer it would be passed to us. My professor isn't too bright and didn't know what to reply with. Can someone give me a scientific explanation of why this is not true so that I can at least debate against this person? I know that the virus is replicated. I don't know whether or not it's an RNA or DNA virus. If RNA I know it would replicate outside of the nucleus and have no contact with our DNA. Any clarification? [link] [comments]  |
| How do we know that earth isn't inside of a nebula? Posted: 21 Oct 2019 09:20 AM PDT Considering that nebulae can streched across hundreds of light years, how did we come to conclusion that we aren't in one? [link] [comments]  |
| How does spontaneous symmetry breaking explain the Higgs field? Posted: 21 Oct 2019 07:24 AM PDT |
| How does the stomach replenish loss of acid? Posted: 21 Oct 2019 06:26 AM PDT When you vomit, and even just through the regular process of digestion the stomach looses some acid, how does it "refill" itself? [link] [comments]  |
| How do the center of planets/stars behave? Posted: 21 Oct 2019 06:07 AM PDT Is the material in the center of planets and stars just held there by the pressure of everything above it. Is it "weightless" in the center of planets/stars? It seems counter initiative that there is more mass outside the very center point of a planet/star so shouldn't that gravity be pulling it apart all around and away from the center but at the same time all that mass is pulling itself inward because to an outside point there's more mass towards the center were the matter is being pulled and making that pressure that the center feels. [link] [comments]  |
| Why are is blood delivered so slowly during a transfusion? Posted: 21 Oct 2019 02:37 AM PDT |
| How Do The Electronics Of LCD/OLED Displays Work? Posted: 21 Oct 2019 01:41 AM PDT To clarify, I'm not asking about the optical side of things. I understand how you can create an image by activating/deactivating LEDs or light blocking liquid crystals in a large grid matrix. However, since a typical display has millions of pixels you wouldn't be able to just run a wire from the controller to every single individual pixel. I'm assuming it works with some kind of periodic timed signal similar to old cathode ray tubes, but how do the actual electronic components for this work? How does the display controller select which of the millions of pixels it's talking to? [link] [comments]  |
| Do metal liquids (i.e. mercury), seep through materials (paper, fabric) like water would? Posted: 20 Oct 2019 09:07 PM PDT |
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