Moving water is one of the quickest ways to cool something down, but also to defrost it- why? |
- Moving water is one of the quickest ways to cool something down, but also to defrost it- why?
- Is the digestive process always first-in, first-out, or can quickly digestible meals "pass" slower digesting meals in the intestines?
- Why are moles often the site of skin cancer? Doesn't more melanin mean more protection from the sun?
- How significant is effect of friction losses in fluid transmission lines?
- How sure are that the K-T extinction event was caused by the Chicxulub asteroid?
- What are the effects of lithium levels (on the range of 0-50 mg/L) in drinking water?
- What causes gasses to be different colors?
- I have studied that that blood vessels, like any tissue, need nutrients and hence there are tiny blood vessels on their walls known as "vasa vasorum". The question here is, how these tiny structures get their own supply?
- What’s the consensus on using combination antibiotics in order to reduce the effect of bacterial resistance?
- Transplants, what's done before they happen?
- Is it possible to have an anaphylactic reaction upon your first exposure to the allergen?
- Are sound waves affected by gravity?
- Can scientist predict volcanic activity and why hasn't anything like Pompeii happened recently and how long after an eruption does a place recover?
- Is a shockwave different from a sound?
- How much "lag" is there in the human brain?
- Can birds get fat?
- How do we know, or do we know, that the parts of an atom are round?
- How does tidal heating work?
- Why don't strong magnetic fields disrupt the normal electrical activity of cells?
- How do radio stations know how many receivers are listening to them?
- Why is both helium 3 and deuterium required for a fusion reaction?
| Moving water is one of the quickest ways to cool something down, but also to defrost it- why? Posted: 11 May 2018 04:58 AM PDT I remember learning a while ago that many rural and poor communities throughout the world use running water as refrigeration for food and that it's an incredibly fast way of cooling something. I recently discovered that running water is also practically the quickest way we have of defrosting things. I understand that water is a great insulator and heat conductor but that doesn't explain the counter-intuity here. Is there something else going on? [link] [comments]  |
| Posted: 10 May 2018 03:33 PM PDT Google searches only seem to bring up information on constipation. [link] [comments]  |
| Why are moles often the site of skin cancer? Doesn't more melanin mean more protection from the sun? Posted: 10 May 2018 06:47 PM PDT |
| How significant is effect of friction losses in fluid transmission lines? Posted: 11 May 2018 01:00 AM PDT In comparison to other losses in the system, e.g. consider a simple circuit of a pump and motor connected How would this change with line length? [link] [comments]  |
| How sure are that the K-T extinction event was caused by the Chicxulub asteroid? Posted: 11 May 2018 06:50 AM PDT |
| What are the effects of lithium levels (on the range of 0-50 mg/L) in drinking water? Posted: 10 May 2018 05:58 PM PDT I was reading about lithium in well water and came across a few interesting articles: Says low levels can raise or lower dementia risk, depending on dose https://www.tandfonline.com/doi/abs/10.1080/07315724.2002.10719188 Says low water lithium levels are correlated with some negative behaviors http://www.jpands.org/vol20no4/marshall.pdf Looks super sketchy, and pretty much says lithium is the best thing ever. Since I can't bring myself to trust that last one, I was hoping r/askscience might be able to give some input. [link] [comments]  |
| What causes gasses to be different colors? Posted: 11 May 2018 07:22 AM PDT Like how oxygen and water vapor are colorless or how nitrogen is white right after it boils and then colorless once it settles. [link] [comments]  |
| Posted: 11 May 2018 07:20 AM PDT |
| Posted: 11 May 2018 07:17 AM PDT I've read little bits from several different places on ways in which we can combat bacterial resistance. One study mentioned the use of several different antibiotics all targeting different essential pathways of a bacteria in order to reduce the chances that a certain amount of the population will survive and proliferate. It was something along the lines of: say the chance bacteria A has a mutation M1 which allows it to survive antibiotic 1 is 1/1000 and the chance it has mutation M2 to survive antibiotic 2 is also 1/1000. Then if we use both antibiotics 1 and 2 together the odds of any one bacteria having the exact two mutations necessary for survival decreases drastically as the probability becomes (1/1000)2. What if we use 3 antibiotics? Or 10? Are we already doing this? If so is it general practice? If we aren't why not? I read something which mentioned the interactions between antibiotics being a difficult factor to control for but surely we could work this out and we would work this out in order to fight something so threatening such as bacterial resistance? Thanks in advance :) [link] [comments]  |
| Transplants, what's done before they happen? Posted: 11 May 2018 06:54 AM PDT Like compatibility with donor and receiver. Why do some fail after some years? Are blood test done before such as mixing of the blood? [link] [comments]  |
| Is it possible to have an anaphylactic reaction upon your first exposure to the allergen? Posted: 11 May 2018 05:49 AM PDT Second year medical student here - as I'm currently preparing for my immunology exam, I was reading up on anaphylactic response. As far as my textbook says, the 1st type of hypersensitivity reaction is the cause for anaphylaxis, but it says that such a reaction (anaphylaxis) can only occur in a later exposure - so I presume you can only get an allergic anaphylactic reaction upon your second exposure to the allergen. However, I was wondering - since common anaphylaxis triggers are venom from insect bites or stings, I was wondering, in a hypothetical situation - if I was bitten by a poisonous snake (e.g. by a common adder) - is it possible to get an anaphylactic response immediately or would I have to be bitten twice by the same species? Thank you! [link] [comments]  |
| Are sound waves affected by gravity? Posted: 11 May 2018 04:47 AM PDT I was just reading a different post about volcanoes and someone had brought up a (I'm dumbing this down because phone) super loud eruption that was heard clearly 3000 miles away from its source. Following that statement was a fun fact of the sound waves circling earth four times. Is this possible? Wouldn't it go in a straight line either way and not stop until leaving the atmosphere? [link] [comments]  |
| Posted: 10 May 2018 10:49 AM PDT So, after watching the news about the volcanic activity in Hawaii, I had a few different questions that are all related. 1.) Can scientists predict a volcano eruption, and if so how soon can they do it and how? 2.) Why has there not been any crazy volcanic activity like what you read about with Pompeii, etc.? 3.) How long does it take an area to recover/become habitable after a volcanic eruption? [link] [comments]  |
| Is a shockwave different from a sound? Posted: 10 May 2018 08:33 PM PDT So I was holding a loaf of bread once as someone slammed the microwave door fairly hard on the other side of the kitchen. The sound wasn't too loud, but I could also sense something in the bread as the door slammed, like it was vibrating at that moment. So I assume that was the shockwave, somehow. I guess my question is, why can I only seem to feel this sensation when I'm holding literally nothing but a loaf of bread, when I can hear the sound just fine? If it's of any importance, the loaf is fairly 'sealed' from the outer layer, so it acts sort of like a balloon. [link] [comments]  |
| How much "lag" is there in the human brain? Posted: 10 May 2018 03:50 PM PDT It seems no matter where you go the brain is always compared to a computer. Since your neurons don't transmit at the speed of light in a vacuum there has to be some form of lag. I first thought well maybe it's reaction time but I'm more wondering about the time it takes for the senses to transmit and the brain to receive that information [link] [comments]  |
| Posted: 10 May 2018 02:36 PM PDT |
| How do we know, or do we know, that the parts of an atom are round? Posted: 10 May 2018 09:52 PM PDT Every representation of parts of an atom, the protons, neutrons, and electrons, they're always presented as being round. Is this something we know or something that is at least likely, or is this just some rudimentary way of representing the parts, and if they are at least likely or we know they're round how do we come to this conclusion? [link] [comments]  |
| Posted: 10 May 2018 05:28 PM PDT I was watching a video and someone said that some Jupiter's moons aren't as cold due to a process called tidal heating but didn't add much to it. Can someone explain because it sounds cool? [link] [comments]  |
| Why don't strong magnetic fields disrupt the normal electrical activity of cells? Posted: 10 May 2018 05:03 PM PDT If cells rely on charged particles for function, such as the electrochemical gradient of a nerve cell, it seems like a strong magnetic field should change the alignment/direction/movement of the molecules. [link] [comments]  |
| How do radio stations know how many receivers are listening to them? Posted: 10 May 2018 08:47 AM PDT |
| Why is both helium 3 and deuterium required for a fusion reaction? Posted: 10 May 2018 11:33 AM PDT I was watching a video (https://youtu.be/mZsaaturR6E) (yep I'm not too versed) and they said that both deuterium and tritium or helium 3 was required for the fusion reaction. Why can deuterium not fuse with itself? If the plasma was hot/dense enough would this be possible? [link] [comments]  |
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