Why don't plants get sunburned or genetic damage/cancer being out in the sun all day? |
- Why don't plants get sunburned or genetic damage/cancer being out in the sun all day?
- How would the low thermal output of Chernobyl's reactor #4 on the night of the Chernobyl disaster have contributed to the reactor core's instability?
- How violent/rapid was the separation of Pangaea?
- Are fingerprint mutations (such as a random patch of dots instead of lines) common?
- Why, in layman terms, was the black body problem so important in quantum physics?
- Is a great circle route really a straight line, or does your heading constantly change?
- Can individuals with complete hearing loss "hear" via bone conduction? E.G. Shower water hitting your body, resonating bass at concerts etc.?
- What is keeping the inner layers of the Earth hot?
- Why is uranium the unique element used in nuclear fission and hydrogen for nuclear fusion?
- How long do Pacific salmon live after spawning?
- How did they determine the identity of Abu Bakr Al-Baghdadi so quickly?
- Why do Cpu’s and Gpu’s and other electronics preform better at lower temperatures?
- What happens to the extra skin when you lose a significant amount of weight?
- Do Nocturnal Predators Often Hunt/Eat Sleeping Prey?
- Why are some earthquakes only felt by those hundreds of kilometres from the epicentre?
- Why do dead whales explode?
- How exactly do we know what causes food poisoning?
- What type of fossils are most likely buried underneath the Antarctic ice shelf?
- Are there any 2 species alive today that share a common ancestor species, which is also alive today?
- Why does stretching your muscles feel good?
- Is effective nuclear charge always going to be the same as the number of valence electrons?
- What makes certain fruits and vegetables rich in particular compounds?
- Why do things “go stale.” I know it’s caused by exposure to air but what actually happens chemically?
| Why don't plants get sunburned or genetic damage/cancer being out in the sun all day? Posted: 27 Oct 2019 05:17 PM PDT When UV-B radiation and other solar radiation hits plants like trees or grass, why does it not cause genetic damage to the plants DNA? [link] [comments]  |
| Posted: 27 Oct 2019 04:07 PM PDT I am currently reading the book Midnight in Chernobyl, and I am mostly clear on the sequence of errors that led to the Chernobyl disaster. But one detail I am not clear on is why a low thermal output (200mw), in itself, would make an accident more likely. The book states that the thermal output of the reactor during the backup power test was meant to be between 700 and 1000mw, but one of the people supervising the test insisted that the reactor's thermal output be brought down to 200mw. The book speculates that this person insisted on the lower thermal output because he assumed it would be safer, and to my (layman's) mind, this seems to make sense. As it happened, due to operator error, the thermal output of the reactor dropped to around 30mw, leading to xenon poisoning in the reactor. To bring the reactor back up to 200mw, virtually all of the control rods in the reactor were manually removed and numerous automatic failsafes were overridden. Supposing instead that the reactor was gradually brought down from its normal operating level to 200mw, could something still have gone wrong owing only to the low thermal output? [link] [comments]  |
| How violent/rapid was the separation of Pangaea? Posted: 27 Oct 2019 01:04 PM PDT Hi all, I am wondering how the first few moments would have played out when Pangaea broke up. Was there an almighty quake followed by a dramatic split? Or was it a small split of just a few centimetres that accelerated slowly? Would there have been a point where there was literally a few centimetres separating the continents? Thank you [link] [comments]  |
| Are fingerprint mutations (such as a random patch of dots instead of lines) common? Posted: 27 Oct 2019 11:00 AM PDT My left index finger has this mutation and I was curious to know if it was common or not. I can try to post pictures if anybody is interested. E: Here's a couple pictures. Sorry for poor photo and skin quality. [link] [comments]  |
| Why, in layman terms, was the black body problem so important in quantum physics? Posted: 27 Oct 2019 01:06 PM PDT I am reading about it, but I cannot make sense out of it. Why quantization was so controversial? What was the problem really? I know high school physics, so not so layman. [link] [comments]  |
| Is a great circle route really a straight line, or does your heading constantly change? Posted: 28 Oct 2019 02:02 AM PDT u/YMK1234 argues that a great circle is really a straight line. I am arguing that, except in the case of traveling on a meridian of longitude or on the equator, your heading constantly changes when traveling along a great circle. From my basic understanding, a non-Euclidean mathematician might be best to answer? [link] [comments]  |
| Posted: 28 Oct 2019 12:24 AM PDT Theoretically I'd assume this makes sense, but are there conditions which inhibit this? [link] [comments]  |
| What is keeping the inner layers of the Earth hot? Posted: 27 Oct 2019 07:35 AM PDT What exactly is keeping magma in the mantle hot, shouldn't it have cooled after millions of years? [link] [comments]  |
| Why is uranium the unique element used in nuclear fission and hydrogen for nuclear fusion? Posted: 27 Oct 2019 05:48 PM PDT Since nuclear fission generates radioactive residue in cause of uranium use, why can't we use other element? The same question for nuclear fusion with hydrogen, could we use other elements? [link] [comments]  |
| How long do Pacific salmon live after spawning? Posted: 27 Oct 2019 12:24 PM PDT I couldn't find much data on how long salmon live after spawning, although I read somewhere that females will guard their redds for 1-2 weeks before dying. What happens to the males as they undergo senescence? Do they swim back towards the ocean as they deteriorate? Bonus q: I read that the male giant octopus lives for a few months after reproduction, out of a total lifespan of 3-5 years. Is there another animal that spends a higher % of its time in programmed senescence? [link] [comments]  |
| How did they determine the identity of Abu Bakr Al-Baghdadi so quickly? Posted: 27 Oct 2019 08:06 AM PDT As you've probably heard they've killed the ISIS leader. And according to Trump, their lab. unit had a positive identification after 15 min. How is that possible to do on-site? I could imagine them having some quick blood tests, specific for him, but I would still wonder how would the know with what to compare? And I would believe that DNA testing takes way longer and again they would need a sample of his DNA from before, which I imagine they didn't have. [link] [comments]  |
| Why do Cpu’s and Gpu’s and other electronics preform better at lower temperatures? Posted: 27 Oct 2019 10:08 PM PDT Normally i would lean towards some thing being hotter preforms better like: matter heating up = particles moving faster. So why do electronics get bogged down by heat, and some out preforming at temperatures lower than ambient temps? [link] [comments]  |
| What happens to the extra skin when you lose a significant amount of weight? Posted: 27 Oct 2019 09:04 AM PDT What happens to the extra skin if someone loses enough weight to significantly change their body shape?Does it get broken down somehow? Does is just kind of hang there? [link] [comments]  |
| Do Nocturnal Predators Often Hunt/Eat Sleeping Prey? Posted: 27 Oct 2019 04:30 PM PDT It seems to me that it'd be significantly easier for nocturnal predators to just find diurnal prey animals that are asleep and kill those instead of hunting down nocturnal ones that are awake. Are sleeping animals that much harder to find, or is this just something that you don't usually hear about? [link] [comments]  |
| Why are some earthquakes only felt by those hundreds of kilometres from the epicentre? Posted: 27 Oct 2019 11:21 AM PDT Today in New Zealand there was a magnitude 5.0 earthquake near Tauranga. This is a felt report where people can voluntarily submit the level of shaking they felt marked by squares. You can see the epicentre just south of Tauranga (near the top of the map) which is a relatively large city by NZ standards. However, the closest people who felt anything were 300km south east, and some were even over 500 km south from the event. This isn't hugely common but this definitely isn't the first time I've noticed it either. Why would the people in the first 100km radius not feel anything at all whereas those 300km south do? And why does nobody north feel anything at all? [link] [comments]  |
| Posted: 27 Oct 2019 10:23 AM PDT |
| How exactly do we know what causes food poisoning? Posted: 27 Oct 2019 04:12 PM PDT So it's common knowledge that certain bacteria and parasites can cause food poisoning. On the bacteria side, we have E coli., salmonella, and campylobacter. In terms of parasites, we have trichinosis and roundworms in fish like nematodes. However, how exactly do we know these pathogens are causing the symptoms of food poisoning? To my knowledge, we all have these bacteria in our intestines at any given time and are perfectly healthy and fine (well at least E-coli., not sure about the other two). What is the mechanism of action for "food poisoning"? How doe these bacteria cause it. What tests do we have to prove this? Do they simply take stool samples after someone has been sick? [link] [comments]  |
| What type of fossils are most likely buried underneath the Antarctic ice shelf? Posted: 27 Oct 2019 03:59 PM PDT |
| Are there any 2 species alive today that share a common ancestor species, which is also alive today? Posted: 27 Oct 2019 11:05 AM PDT |
| Why does stretching your muscles feel good? Posted: 27 Oct 2019 06:01 AM PDT |
| Is effective nuclear charge always going to be the same as the number of valence electrons? Posted: 27 Oct 2019 10:42 AM PDT In my chemistry class we are using Zeff (Z effective) to find the effective nuclear charge of a valence electron of a given atom. Since I am using the atomic number - valence electrons = core electrons, and atomic number - core electrons = effective nuclear charge, I am always getting the same for valence electrons and effective nuclear charge. Am I doing this correctly? [link] [comments]  |
| What makes certain fruits and vegetables rich in particular compounds? Posted: 27 Oct 2019 01:52 AM PDT For example, why does bell pepper contain almost ten times more vitamin c than banana, but five times less carbohydrates? Is vitamin c somehow necessary for bell pepper to exist? [link] [comments]  |
| Posted: 27 Oct 2019 12:35 AM PDT |
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