What determines the shape of a nebula?

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• What determines the shape of a nebula?
• Why do lasers have a "grainy texture" on the light that they produce?
• How does iodine purify water?
• Why is radioactive decay a random process? Subsequently, why isn't “random” a euphemism for “we don't understand the cause yet”?
• If no one took flu shot in US, would flu spread rapidly? Or do we have some immunity from first exposure that doesn't wane away?
• What is happening to your brain when you come round from anaesthesia? Those videos seem like it’s the most childlike high of any drug.
• Is there a boundary between elements that must exist and those that cant? I.e. what happens if you keep adding protons?
• Is it possible to predict if a reaction is exothermic/endothermic based on the relative stability/energy of the reactant and product?
• Is there a correlation between the reduced pollution from Quarintine/Covid-19 restrictions and the snow in some European countries like Spain? How relevant is this to long term global climate change plans?
• During the distribution of vaccines, is there a point before "herd immunity" levels that would hamper the spread of the virus?
• When insulating something radiating heat with layers of different material, does it matter the order of the material?
• What is the smallest ground bird?
• How can scientists tell when mass extinction events happened?
• Why is lithium peroxide more stable than cesium peroxide?
• Why do free neutrons decay with a half life of around 10 minutes, while neutrons bound in atomic nuclei are relatively stable?
• How do topical creams affect bacteria etc below the skin after they've dried?
• Why do some seconds seem to tick faster?
• Is there concrete evidence to support "first dose first" approach that the UK and some other countries have introduced?

What determines the shape of a nebula? Posted: 09 Jan 2021 07:33 PM PST My question is what conditions impact how nebulas form and why they seem to have unique shapes. submitted by /u/milzz [link] [comments]

Why do lasers have a "grainy texture" on the light that they produce? Posted: 09 Jan 2021 11:36 PM PST I was shining a laser on the ceiling and the reflections that came down seemed to have a somewhat grainy quality about them, and I'm not sure why. Is it the material that it is reflecting off of, is it the fact that me holding it isn't stable enough to keep the light consistent, or is that a property of laser beams? Thanks! submitted by /u/Command_Master [link] [comments]

How does iodine purify water? Posted: 09 Jan 2021 04:24 PM PST submitted by /u/Yarmanite [link] [comments]

Why is radioactive decay a random process? Subsequently, why isn't “random” a euphemism for “we don't understand the cause yet”? Posted: 09 Jan 2021 02:57 PM PST What prevents us from ever being able to predict the radioactive decay of an atom, regardless of technological progress? submitted by /u/Priem19 [link] [comments]

If no one took flu shot in US, would flu spread rapidly? Or do we have some immunity from first exposure that doesn't wane away? Posted: 09 Jan 2021 01:08 PM PST Trying to make sense of herd immunity. submitted by /u/RoundCalligrapher [link] [comments]

What is happening to your brain when you come round from anaesthesia? Those videos seem like it’s the most childlike high of any drug. Posted: 09 Jan 2021 02:06 PM PST The ones here submitted by /u/HawkmothIsDad [link] [comments]

Is there a boundary between elements that must exist and those that cant? I.e. what happens if you keep adding protons? Posted: 09 Jan 2021 02:24 PM PST Asking for an 11 year old. We accept of course that these higher elements won't be stable. submitted by /u/zeugma25 [link] [comments]

Is it possible to predict if a reaction is exothermic/endothermic based on the relative stability/energy of the reactant and product? Posted: 09 Jan 2021 02:56 PM PST i.e If an alcohol is halogenated into a alkyl halide, would it be exothermic or endothermic? (Assuming there's no supporting data) Since the C-Cl bond is weaker than the C-OH bond, I imagine it would be exothermic but I'm not sure if this is the correct reason why or not. But since -Cl is a better leaving group than -OH, which itself needs to be protonated to -OH2+ to leave C, wouldn't the alcohol be at a lower energy level than the alkyl halide, making it endothermic? Sorry if my wording is confusing, it's been a while since I covered this topic lol submitted by /u/Zealousideal_Low1200 [link] [comments]

Is there a correlation between the reduced pollution from Quarintine/Covid-19 restrictions and the snow in some European countries like Spain? How relevant is this to long term global climate change plans? Posted: 09 Jan 2021 11:19 AM PST submitted by /u/Inninja_3 [link] [comments]

During the distribution of vaccines, is there a point before "herd immunity" levels that would hamper the spread of the virus? Posted: 09 Jan 2021 12:40 PM PST I suppose to be more specific there are two types of scenarios with an answer like this (that I can think of): The effect of a vaccine reducing the spread of the virus gradually, or is there specific points along that distribution process that would hamper the virus? submitted by /u/zzing [link] [comments]

When insulating something radiating heat with layers of different material, does it matter the order of the material? Posted: 09 Jan 2021 03:59 PM PST For example, let's say you have a heat source you want to insulate and you have a layer of aluminum and a layer of cotton. Does it matter which layer you put first or will the result be the same? submitted by /u/floatable_shark [link] [comments]

What is the smallest ground bird? Posted: 09 Jan 2021 09:13 PM PST The smallest terrestrial non flying bird is the inaccessible island rail. How about the smallest ground bird that can fly? submitted by /u/Haplophyrne_Mollis [link] [comments]

How can scientists tell when mass extinction events happened? Posted: 09 Jan 2021 04:51 PM PST So I'm trying to understand history and science a little bit more, but I definitely know very little as of right now. I've been reading about extinction events, specifically The Big 5, but I can't find an explanation of how scientists know these events happened. Is it just that there are far fewer fossils dating back to these time periods, or is it something much more complex? Thanks! submitted by /u/wiseclayofficial [link] [comments]

Why is lithium peroxide more stable than cesium peroxide? Posted: 09 Jan 2021 02:26 PM PST submitted by /u/Jaceeturner6 [link] [comments]

Why do free neutrons decay with a half life of around 10 minutes, while neutrons bound in atomic nuclei are relatively stable? Posted: 09 Jan 2021 04:35 PM PST submitted by /u/mephistoA [link] [comments]

How do topical creams affect bacteria etc below the skin after they've dried? Posted: 09 Jan 2021 12:01 PM PST I read about a chemical in anti-acne cream I use, Benzoyl peroxide, and that it primarily works by killing bacteria under the skin, but I have to ask how does this work after its dried onto my skin? Is it because the skin absorbs a certain amount as it dries? If that's the case, why does it keep working after the ointment has dried, but stops if I remove said dried piece of ointment? submitted by /u/Empoleon_Master [link] [comments]

Why do some seconds seem to tick faster? Posted: 09 Jan 2021 11:28 AM PST So I've noticed when I'm running on the treadmil and looking at the time on my digital timer the seconds sometimes jump from 19 to 21 for example, as if my brain doesn't process 20 or goes really really quickly. Is this due to any mechanism of the human eye? submitted by /u/Restless_Carrot [link] [comments]

Is there concrete evidence to support "first dose first" approach that the UK and some other countries have introduced? Posted: 09 Jan 2021 06:21 AM PST As this is not my field and reading the appropriate studies is quite complex, this has been bothering me, is this idea scientifically proven or just speculation and or politics? submitted by /u/MoreBend [link] [comments]

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I've seen reports that the Pfizer coronavirus vaccine may give up to 52% protection 10 days after the first shot. Does the Moderna data suggest anything like this as well?

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• I've seen reports that the Pfizer coronavirus vaccine may give up to 52% protection 10 days after the first shot. Does the Moderna data suggest anything like this as well?
• In solid-state physics, how can a specific arrangement of atoms break time-reversal symmetry like in the crystal hall effect (CHE)?
• How can a new variant of SARS-CoV-2 be both more infectious but not increase in pathogenicity?
• If someone got severe side effects from a vaccine, would the effects of the disease be even worse?
• Is an earthquake of a magnitude of 10,11 or 12 feasible?
• How are vaccines and other drugs tested in children?
• Moderna mRNA vaccine, does it change your genome?
• Since they are considering no reserve vaccines, what happens if someone isn't able to get their second dose at the right time? Can the just get it after a couple months, or will the have to get both doses again to get the full effect?
• Topographers: how is topographical data stored?
• What is underneath the sand at the bottom of the ocean?
• How do we know the rate at which atomic clocks lose time?
• Where is degree Celsius officially defined?
• How likely are you to get infected with COVID-19 from your own hair if you practice social distancing?
• How effective are two dose vaccines if you get the second dose long after the recommended time interval?
• Do any doctors have a guesstimate about how long until Moderna and Pfizer roll out their vaccines?
• Why Does the COVID-19 Vaccine Cause Such a Robust Symptomatic Immune Response?
• Why do batteries shut down even when they have a little bit more power on them?
• What is the evidence that children (in particular in school settings) transmit covid less than adults?
• Why would adding CO2 make your blood more acidic if it always makes a HCO3- along with each H+?
• Why don’t bacteria evolve resistance to soaps like they do to antibiotics?
• How can we determine that, say, 5 billion years ago the universe was expanding slower than it is now and then accelerated for some reason to a faster acceleration and what caused that change?
• Is Ivermectin being considered/used as a treatment to the Covid-19 virus?
• What is the mechanism which causes electrons to drop in energy once entering a quantum well?

I've seen reports that the Pfizer coronavirus vaccine may give up to 52% protection 10 days after the first shot. Does the Moderna data suggest anything like this as well? Posted: 08 Jan 2021 09:17 AM PST submitted by /u/flaystus [link] [comments]

In solid-state physics, how can a specific arrangement of atoms break time-reversal symmetry like in the crystal hall effect (CHE)? Posted: 09 Jan 2021 06:29 AM PST To my understanding, time-reversal symmetry describes that some processes can be reversible in time (e.g. a car going at a velocity of v will travel with a velocity of -v when time is reversed) and some other processes are not symmetric to time, like a cup of coffee cooling down. I read about the crystal hall effect in antiferromagnets and am a little confused as to how this effect comes about. submitted by /u/bass_toelpel [link] [comments]

How can a new variant of SARS-CoV-2 be both more infectious but not increase in pathogenicity? Posted: 09 Jan 2021 04:37 AM PST The data shows that the new variant of SARS-CoV-2 appears to be more transmissible but luckily not anymore deadly than the normal variants. But if a SARS-CoV-2 variant has a mutated spike protein that allows it to be more infectious and transmissible, doesn't this mean that it's better able to get into our cells? And wouldn't this increased ability to invade our cells necessarily also increase its ability to cause disease? In general, the more cells that become infected, the greater the disease, right? What possible mechanisms would allow the virus to be more easily transmissible, yet have no effect on pathogenicity? I'm looking specifically for mechanistic reasons why pathogenicity and infectiousness are seperate (ie. the spike proteins on the new variant don't break off the viral cell wall as much as other variants, so more host cells will become infected, but once it gets inside the host cell perhaps the RNA replicase the variant has isn't as effective in creating the proteins that eventually lead to severe disease?) submitted by /u/rabidsoggymoose [link] [comments]

If someone got severe side effects from a vaccine, would the effects of the disease be even worse? Posted: 09 Jan 2021 04:17 AM PST Let's say polio vaccine. A child got that vaccine, developed autoimmune encephalitis. Had the child not taken the vaccine, but gotten the disease, would the disease run a much more severe course than usual in that child? submitted by /u/sunsetsurprise [link] [comments]

Is an earthquake of a magnitude of 10,11 or 12 feasible? Posted: 08 Jan 2021 09:43 PM PST If so, what would the collateral damage of such a massive earthquake entail? Does it have the potential to cause mass extinction? I feel like a magnitude of 10 earthquake would cause a lot of damage but certainly wouldn't wipe out life on Earth, right? submitted by /u/Hot_Improvement_3598 [link] [comments]

How are vaccines and other drugs tested in children? Posted: 08 Jan 2021 04:51 PM PST Children can't consent to medicine trials the same way that adults can, so how do drug developers test the safety and efficacy of drugs in children? submitted by /u/geareduptiger [link] [comments]

Moderna mRNA vaccine, does it change your genome? Posted: 09 Jan 2021 07:36 AM PST I know that mRNA goes to the ribosome to create proteins and this mRNA has been designed to produce spike proteins so your immune system can make antibodies. But I've heard online that the mRNA could actually end up changing your genome, like how a herpes virus can infect a hosts genome and remain dormant in the hosts cell for a long time. Do you think there is reason to worry about this? I'm asking because my mom is a teacher and I'm worried that the vaccine hasn't been tested enough and she's going to be a human guinea pig. submitted by /u/leaves27 [link] [comments]

Since they are considering no reserve vaccines, what happens if someone isn't able to get their second dose at the right time? Can the just get it after a couple months, or will the have to get both doses again to get the full effect? Posted: 08 Jan 2021 06:42 PM PST submitted by /u/Chcken_Noodle_Soup [link] [comments]

Topographers: how is topographical data stored? Posted: 08 Jan 2021 09:09 PM PST submitted by /u/CountMoosuch [link] [comments]

What is underneath the sand at the bottom of the ocean? Posted: 08 Jan 2021 12:10 PM PST For there to be sand at the bottom of the ocean, that would mean there is something holding it up. What is it? Or maybe to better phrase the question "What was the ocean floor made of before sand?" submitted by /u/BRNJi240 [link] [comments]

How do we know the rate at which atomic clocks lose time? Posted: 08 Jan 2021 02:04 PM PST If they are the most accurate means of measuring time, what are they being compared to when we say they drift x seconds in y million years etc. submitted by /u/lad_astro [link] [comments]

Where is degree Celsius officially defined? Posted: 09 Jan 2021 03:35 AM PST We all know that the tripple point of Water is defined to be 273.16K or 0.01°C. Ok, was, but lets not get into that detail. BIPM, and with that most of the world, adopted the Kelvin scale (defined by the absolute zero and the triple point of water) as the temperature scale (adopted by CGPM-9). But there seems no re-definition of the Celsius scale after Kelvin got adopted as temperature scale in CGPM-10, nor when later the scale got clarified/redefined in CGPM-13. While we all base Celsius upon Kelvin, I was not able to find any formal or legal definition of this. So, where is the Celsius scales, that the NMIs use for calibration of instruments, officially defined? submitted by /u/NoSuchKotH [link] [comments]

How likely are you to get infected with COVID-19 from your own hair if you practice social distancing? Posted: 08 Jan 2021 05:27 PM PST I have fairly long hair and a beard and I am wary to wash it every day because I don't want to dry out the strands. I have been washing it every time I leave my condo, but as I'm growing it out, it's getting very dry/split ends and I'm trying not to trim it any more than every six months. I have been meticulously practicing social distancing, but some instances of possible exposure are unavoidable, as I work in a high volume business and live in a condo and use the elevator. I searched online and there was not a lot of insight as to what the actual odds are of getting infected from your hair, but some doctors erred on the side of caution and advised washing hair daily. I was wondering if rinsing hair every night under lukewarm water with a high pressure shower head for several minutes and conditioning regularly would rinse out any latent Covid particles. Obviously after work I plan on using shampoo, but if I hop in to the elevator and go up to the laundry room of my building, am I super likely to contract Covid from being in the elevator and shared laundry area? I'm also very careful about disinfecting/washing my hands neurotically after touching any surface that anyone else may have touched. I also am extremely cognizant not to touch my hair or face if my hands might be contaminated. I guess my biggest worry would be going to bed at night with the possibility of having Covid on my hair, rubbing it onto my pillow, and then breathing it in from there. Can I relax with shampooing my hair everyday or does leaving it unwashed greatly elevate my risk of contracting the virus? submitted by /u/danubian-prince [link] [comments]

How effective are two dose vaccines if you get the second dose long after the recommended time interval? Posted: 08 Jan 2021 01:58 PM PST This has become relevant due to Biden's plan to release COVID-19 vaccines that were being previously reserved as second doses. https://www.cnn.com/2021/01/08/politics/biden-vaccine-strategy/index.html Let's say you receive the first dose of a vaccine and it is recommended to get the second dose one month later. But instead you do not receive the second dose for multiple months or even a year later. How does that impact the effectiveness of the vaccine after receiving the second dose? Do you have to start the dosing schedule over again (i.e. receive a third dose at the correct time interval after the second dose) to achieve immunity? Obviously there isn't data yet to understand how this would impact COVID-19 vaccine effectiveness. But I'm wondering if there is data on other vaccines that can be used for comparison. submitted by /u/Locksul [link] [comments]

Do any doctors have a guesstimate about how long until Moderna and Pfizer roll out their vaccines? Posted: 09 Jan 2021 12:57 AM PST Like how long does it take them to produce it and how much can they produce at any given time. submitted by /u/Selfish_Princess [link] [comments]

Why Does the COVID-19 Vaccine Cause Such a Robust Symptomatic Immune Response? Posted: 08 Jan 2021 12:13 PM PST I got my COVID vaccine yesterday at 5 pm, and this morning woke up with a headache, malaise, and significant shoulder pain. But I get the flu vaccine every year, and I only get mild shoulder aches, and when I give teenagers vaccines for HPV, TDaP, and meningitis, they also don't get much more than mild muscle aches at the site of injection the next day. And I'm not an isolated case. Most of my co-workers report about 24 hours of these headaches, malaise, and arm pains after getting the vaccine before it self-resolves. I am aware that my body is mounting an immune response. But why is it so much more symptomatic than the reaction to other vaccines? submitted by /u/BallerGuitarer [link] [comments]

Why do batteries shut down even when they have a little bit more power on them? Posted: 08 Jan 2021 07:56 PM PST Why do batteries seemingly have some juice still in them when they die? For example, when a phone runs out of battery you can try to turn it on again. It might die right on the boot or even once it's turned on if you're lucky (It actually depends on the firmware, some don't try to turn but it's clear that they still have a bit of power left). Why do manufacturers do this? Is this some property of the li-ion architecture? Is this some design choice, maybe to increase battery life? Why not let the user choose to empty the battery for an emergency then? This is a question I've had for a while and I couldn't find an answer anywhere else, so let's see what's it! submitted by /u/TerranToplaner [link] [comments]

What is the evidence that children (in particular in school settings) transmit covid less than adults? Posted: 08 Jan 2021 07:18 AM PST Many countries have kept their schools open on the basis that children do not transmit covid to the same degree as adults. This, in my mind, would be difficult to prove if many child carriers are asymptomatic as has also been reported. Can anyone shed light on the methodologies and significant studies that suggest children do not transmit the disease as much as adults? submitted by /u/AndyMandible [link] [comments]

Why would adding CO2 make your blood more acidic if it always makes a HCO3- along with each H+? Posted: 08 Jan 2021 07:53 AM PST Hello, I have always been deeply confused by this concept for an embarrassingly long time. But if you hypoventilate and thus increase the CO2 in your blood, this will combine with H2O to make H2CO3, which then makes HCO3- and H+. why would this disassociation of H2CO3 decrease your pH? if it always adds a HCO3- along with its H+? Also why does carbonic anhydrase exist? why would your body want to make the reaction CO2+H2O=H2CO3 faster? Thank you submitted by /u/Odin_the_frycook [link] [comments]

Why don’t bacteria evolve resistance to soaps like they do to antibiotics? Posted: 08 Jan 2021 08:20 AM PST submitted by /u/vertigo6969 [link] [comments]

How can we determine that, say, 5 billion years ago the universe was expanding slower than it is now and then accelerated for some reason to a faster acceleration and what caused that change? Posted: 08 Jan 2021 06:49 AM PST submitted by /u/levainletlive [link] [comments]

Is Ivermectin being considered/used as a treatment to the Covid-19 virus? Posted: 08 Jan 2021 02:33 PM PST If so, where is it being used and is it as promising as many articles have claimed? and if not in use nor being considered then why is that? submitted by /u/lololoabb [link] [comments]

What is the mechanism which causes electrons to drop in energy once entering a quantum well? Posted: 08 Jan 2021 02:23 PM PST After reading about quantum wells, I learned that electrons will wander from the larger bandgap material which sandwiches a smaller bandgap material, and then drop in energy upon entering the low bandgap material, therefore, trapping it. Which is fair enough, that makes sense. But I haven't been able to find a resource which describes why this drop in energy occurs. Where does the excess energy from the electron go, why does it drop in energy in the first place? submitted by /u/magginator8 [link] [comments]

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Why if I mix green and red paints in equal proportions, I see a desaturated brown, but if I mix green and red light in equal proportions like in an LCD screen, I get pure yellow?

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• Why if I mix green and red paints in equal proportions, I see a desaturated brown, but if I mix green and red light in equal proportions like in an LCD screen, I get pure yellow?
• Why are so many of the longest living trees conifers/gymnosperms?
• How do we know that blue whales weigh upwards of 200 tons. How do you physically weight them?
• Are there any instances in the fossil record of a marine amniote evolving back into a primarily terrestrial animal?
• Why is most of the ozone present in one small layer?
• How much Corona Virus needs to be present for detection in local wastewater treatment systems?
• Why are there viral DNA sequences in the genomes of plants and animals?
• What’s the reason for the difference in covid vs flu ICU admissions?
• How fast would a vertical platform have to accelerate for you be able to stand on it sideways?
• Does Covid19 convalescent plasma treatment depend on the nucleocapsid antibody?
• Could Covid-19 mutate to the point that current PCR/antigen tests wouldn’t work?
• Where are the highest concentrations of capillaries in human skin?
• Where does all of the material that eventually covers artifacts come from?
• How does Power Level work on my microwave?

Why if I mix green and red paints in equal proportions, I see a desaturated brown, but if I mix green and red light in equal proportions like in an LCD screen, I get pure yellow? Posted: 07 Jan 2021 08:38 AM PST Edit: This art installation might help some to understand how color is reflected, and more specifically how that color must be present in the illumination source in order for us to see it. Anything in the room that is not yellow appears to be in black and white. submitted by /u/Tink_Tinkler [link] [comments]

Why are so many of the longest living trees conifers/gymnosperms? Posted: 07 Jan 2021 07:39 PM PST submitted by /u/inquilinekea [link] [comments]

How do we know that blue whales weigh upwards of 200 tons. How do you physically weight them? Posted: 07 Jan 2021 10:08 AM PST submitted by /u/VoidTrout98 [link] [comments]

Are there any instances in the fossil record of a marine amniote evolving back into a primarily terrestrial animal? Posted: 07 Jan 2021 08:22 PM PST submitted by /u/Smooth_Jazz_Warlady [link] [comments]

Why is most of the ozone present in one small layer? Posted: 08 Jan 2021 03:15 AM PST Why is it that almost all the ozone is present in that one layer? While all the other gasses are mixed evenly throughout the atmosphere. I have tried Google Google this but I didn't get much. All I got was results telling me how ozone was formed, but nothing about why it is almost exclusively in one layer. submitted by /u/PM_ME_GOOD_USERNAMS [link] [comments]

How much Corona Virus needs to be present for detection in local wastewater treatment systems? Posted: 07 Jan 2021 09:17 PM PST Our news outlets have reporting that traces of Corona virus have been detected in some cities wastewater. My Question is, how much of the virus would need to be present in the wastewater treatment system to be detected and how does that translate to potential infection rates in the community? submitted by /u/CentaurLion73 [link] [comments]

Why are there viral DNA sequences in the genomes of plants and animals? Posted: 07 Jan 2021 09:39 PM PST submitted by /u/nerdtrash69 [link] [comments]

What’s the reason for the difference in covid vs flu ICU admissions? Posted: 07 Jan 2021 03:58 PM PST Is the number of admissions to ICU, due to covid much higher than admission due to flu in previous years, because there is more people contracting covid than contract flu, or because covid is a worse illness to contract? submitted by /u/Ldogmcgee [link] [comments]

How fast would a vertical platform have to accelerate for you be able to stand on it sideways? Posted: 07 Jan 2021 10:10 PM PST submitted by /u/dmvaz [link] [comments]

Does Covid19 convalescent plasma treatment depend on the nucleocapsid antibody? Posted: 07 Jan 2021 05:24 PM PST This news article (https://www.azfamily.com/news/continuing_coverage/coronavirus_coverage/people-vaccinated-cant-donate-convalescent-plasma-after-donations-are-needed-now/article_7165b902-44b9-11eb-958a-0bbf419b8600.html) states that vaccine recipients aren't useful for convalescent plasma donation not because of the experimental vaccine disqualification, but because the treatment relies on the nucleocapsid antibodies: Vitalant said the reason why is because the vaccine causes spike antibodies, and for convalescent plasma, they need nucleocapsid antibodies. Is that the case? If so, what drives the requirement and why would the vaccine work and this this not? submitted by /u/Schnort [link] [comments]

Could Covid-19 mutate to the point that current PCR/antigen tests wouldn’t work? Posted: 07 Jan 2021 09:51 AM PST submitted by /u/Seawead [link] [comments]

Where are the highest concentrations of capillaries in human skin? Posted: 07 Jan 2021 09:42 AM PST I'm experimenting with a homemade Photoplethysmogram device and I am getting different pulse strengths from different parts of my body. Supposedly it is the skin capillaries that impact how good the PPG signal is. From online sources, I know fingers, earlobes, foreheads, and toes supposedly have a lot of capillaries that are good for measuring, but this is not very descriptive. Interestingly I can't find any sort of diagram of the human body that shows this information. Follow-up questions: - Does skin capillary density vary from person to person? - For those that are familiar with PPG, is it actually capillary density that is impacting my readings, or is it something else? submitted by /u/Expolymath [link] [comments]

Where does all of the material that eventually covers artifacts come from? Posted: 06 Jan 2021 09:56 PM PST I understand the general concept behind stratification: The deeper an item is, the older is must be compared to items found closer to the surface. My question is: Where does all of that rock and dirt come from? It seems to me that if the diameter of the Earth was growing, then it would make sense that material would be laid down in an even layer around the world and would lead to the clear banding we see in the geological record. But isn't the Earth a closed system? New rock is only pushed out in lava flows and a small amount does come from outer space in the form of asteroids, but I have a hard time believing that is a significant amount. Places that are part of flood planes or other more direct forms of sedimentation totally would bury items rather quickly. What about other areas free from the actions of water? Thank you in advance for any replies. This question has been itching at the back of my mind for a long time. submitted by /u/RosieSprinkle [link] [comments]

How does Power Level work on my microwave? Posted: 06 Jan 2021 06:37 PM PST Is it really lower power or is it on/off periodically? Both? Something else? submitted by /u/syxxiz [link] [comments]

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