A chicken egg is 40% calcium. How do chickens source enough calcium to make 1-2 eggs per day?

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• A chicken egg is 40% calcium. How do chickens source enough calcium to make 1-2 eggs per day?
• The lowest temperature ever recorded was -89C in Antarctica. Was CO2 sublimating on the ground? If so, are there layers of solid CO2 at the south pole?
• What are the Criteria for a Virus Strain Graduate into a New Virus?
• If you damage receptors in your brain do they return?
• How is genetic variation within and between human populations calculated?
• If heart attacks are due to rupture of stable atherosclerotic plaques, shouldn’t we be stenting all coronary arteries with plaques rather than just the ones that are “70% blocked” or so on an angiogram?
• Will the Philippines actually sink?
• How does dehydration cause edema?
• How would orbits work if gravity wasn't inversely proportional to the distance squared?
• How is Earth’s rotation slowing down overtime?
• How is Insulin consumed in the body after its creation ?
• How are the calories of foods determined?
• Does genetic makeup affect vaccine effectivity?

A chicken egg is 40% calcium. How do chickens source enough calcium to make 1-2 eggs per day? Posted: 30 Jan 2021 02:24 PM PST submitted by /u/chinese_bedbugs [link] [comments]

The lowest temperature ever recorded was -89C in Antarctica. Was CO2 sublimating on the ground? If so, are there layers of solid CO2 at the south pole? Posted: 30 Jan 2021 02:26 PM PST According to wikipedia, the lowest temperature on earth was recorded to -89 C at Vostok Station https://en.wikipedia.org/wiki/Lowest_temperature_recorded_on_Earth CO2 sublimates at -78 C. Was there CO2 sublimating as solid onto the ground, or even snowing down, at Vostok Station when that happened, and if so, it is plausible that layers of solid CO2 are present at the south pole. Is there any research on this? submitted by /u/_Gen_Xer_ [link] [comments]

What are the Criteria for a Virus Strain Graduate into a New Virus? Posted: 31 Jan 2021 12:57 AM PST I know that SARS and COVID19 are related, but why are they regarded as separate viruses and Influenza isn't? submitted by /u/VladimirTheDonald [link] [comments]

If you damage receptors in your brain do they return? Posted: 30 Jan 2021 07:13 AM PST Specifically serotonin receptors (MDMA, hallucinogens) Dopamine receptors (Meth, other stimulants) GABA (benzos, alcohol) It seems neurotransmitter levels can rebalance pretty reliably, but I wonder if damage to the receptors themselves from drugs can cause a sort of permanent state of feeling terrible submitted by /u/blondicon [link] [comments]

How is genetic variation within and between human populations calculated? Posted: 30 Jan 2021 11:23 PM PST The fact that there is much more genetic variation within a population, which would previously be referred to as 'race', than between such populations is commonly used to argue against existence of races in humans. What procedure is used to evaluate genetic variation within and between populations, when used in this sense? What proportion of within group and between groups variation would be required to conclude that races exist and why? submitted by /u/Oldanko [link] [comments]

If heart attacks are due to rupture of stable atherosclerotic plaques, shouldn’t we be stenting all coronary arteries with plaques rather than just the ones that are “70% blocked” or so on an angiogram? Posted: 30 Jan 2021 02:55 PM PST Won't a 20% blocked coronary artery still get occluded if the plaque ruptured and was followed by a thrombotic reaction to obstruct blood flow? submitted by /u/Octangle94 [link] [comments]

Will the Philippines actually sink? Posted: 31 Jan 2021 12:26 AM PST I don't know if this article is real or a hoax https://www.straitstimes.com/asia/the-philippines-will-be-underwater-in-30-years-inquirer and it really triggers me if I should save enough money and move to a place where I can't be submerged in water and 'the end of the story' or not worry at all and its just a hoax. submitted by /u/DTAKOP [link] [comments]

How does dehydration cause edema? Posted: 30 Jan 2021 12:37 PM PST so, as far as i know, dehydration means lower blood volume, which means lower blood pressure, while edema is mostly caused by high blood pressure in the veins. submitted by /u/HelloMortalss [link] [comments]

How would orbits work if gravity wasn't inversely proportional to the distance squared? Posted: 30 Jan 2021 08:53 AM PST I just watched a video where someone tried and failed to achieve an orbit in the game Space Engineers, and a commenter said that the gravity decreases linearly in the game, resulting in "a non conservative field of force", so only a perfectly circular orbit would be stable. Another person responded to that by saying that "there are orbits in systems with linear falloff, it uses distance in a higher power". I got curious as to how would these orbits work, but i couldn't find information about them, so, what do the things in quotations mean, and how do different types of strength falloff affect orbits and trajectories? submitted by /u/yopassthesalt [link] [comments]

How is Earth’s rotation slowing down overtime? Posted: 30 Jan 2021 12:35 PM PST I understand it has to do with the Moon pulling away, so there are a bunch of follow up questions... please bear with me 😂 Why is the Moon pulling away from Earth? What exactly does the Moon do to Earth's rotation in the first place? Will there eventually be a time, billions and billions of years away, where the Earth will completely stop spinning as a result of this? submitted by /u/josiegfk [link] [comments]

How is Insulin consumed in the body after its creation ? Posted: 30 Jan 2021 12:14 PM PST I understand the pancreas creates insulin when we eat. What consumes it? What is the chemical process that removes it from the bloodstream (whether it simply decays into certain molecules, or gets transformed when it does its work with cells, or something else). Insulin's by-product, C-Peptides, are created whenever Insulin is created. Similarly, what consumes the C-Peptides? submitted by /u/jjolla888 [link] [comments]

How are the calories of foods determined? Posted: 29 Jan 2021 05:45 PM PST What do they do to find the calories of packaged food? Is it something someone can do with meals they cook themselves? submitted by /u/BirbActivist [link] [comments]

Does genetic makeup affect vaccine effectivity? Posted: 30 Jan 2021 02:51 AM PST Just a simple question on whether genes can affect the effectivity of a vaccine. submitted by /u/Prejudged_Seeker [link] [comments]

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Why don't we see more places like Pompeii (Vesuvius tragedy)? Why is that not a concern today for those living near volcanoes?

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• Why don't we see more places like Pompeii (Vesuvius tragedy)? Why is that not a concern today for those living near volcanoes?
• Now that we have multiple vaccines approved for preventing covid, what's keeping laboratories around the world of pooling together their resources and producing doses for 100% of the world population in weeks instead of years?
• Why is it that a vaccine like J&J can reduce severity of Covid-19 even in cases where it doesn’t provide full immunity?
• How are Flu Vaccines created and tested each year in time?
• How do lie detectors work? How accurate are they?
• (in theory) Could you create a fission reaction with any element if its brought to an near unstable state or isotope?, and what would you need to use to create this reaction for different elements?
• How does long term, childhood trauma physically change the body? And are the effects reversible?
• How efficient is modern lighting technology (e.g. LED lighting) at converting energy to visible light? What are the factors limiting higher efficiency? Are they likely to ever be overcome?
• Why do scientists listen for radio waves when looking for intelligent life?
• Are the seemingly chaotic curves of the small intestine the same in almost everybody, like the shape of the hand, or do they follow different paths in different people?
• About Newton’s third law... if I push a toy car and an equal and opposite reaction is exerted on my hand as I do so by the point of application of the force, wouldn’t the two forces cancel each other out and the car would remain in equilibrium?
• Has the impact of contracting COVID when vaccinated be studied? Until that, what are the expectaitons?
• How is a flat phone battery activated wirelessly to charge up again?

Why don't we see more places like Pompeii (Vesuvius tragedy)? Why is that not a concern today for those living near volcanoes? Posted: 29 Jan 2021 05:54 PM PST I get that volcanoes typically aren't super scary, because of warnings and evacuation and all that - but the heat flash that came out of nowhere and killed everybody within seconds - has that only happened once that we know of? Couldn't it happen again in Hawaii or Japan or anywhere else with a city near a volcano? submitted by /u/heyimjason [link] [comments]

Now that we have multiple vaccines approved for preventing covid, what's keeping laboratories around the world of pooling together their resources and producing doses for 100% of the world population in weeks instead of years? Posted: 30 Jan 2021 03:49 AM PST I'm focusing on possible technical limitations rather than political ones. Is there a maximum theoretical rate at which you can produce a given vaccine? Is it raw materials, equipment, work force? At a sale price of 2 or 5 USD a dose, it's relatively cheap to produce and easily payable by the world's countries combined. submitted by /u/rlemmie [link] [comments]

Why is it that a vaccine like J&J can reduce severity of Covid-19 even in cases where it doesn’t provide full immunity? Posted: 29 Jan 2021 12:08 PM PST The trials indicated that full immunity varied by country, probably due to the different strains. But it was effective at reducing severity across the board at similar rates, regardless of strain. Why does that happen? submitted by /u/dch222 [link] [comments]

How are Flu Vaccines created and tested each year in time? Posted: 30 Jan 2021 04:38 AM PST If there are multiple strains of flu that keep mutating each year and the determination of which flu strains to vaccinate against are decided in the February prior to each flu season, how are manufacturers able to create and test the efficacy of the vaccine in time? How does that process compare with the COVID vaccines development and testing, particularly with regard to the COVID vaccines that are being produced using the standard method of using eggs? submitted by /u/Crayola_Chomper [link] [comments]

How do lie detectors work? How accurate are they? Posted: 30 Jan 2021 06:06 AM PST submitted by /u/lala-palooza [link] [comments]

(in theory) Could you create a fission reaction with any element if its brought to an near unstable state or isotope?, and what would you need to use to create this reaction for different elements? Posted: 30 Jan 2021 05:57 AM PST submitted by /u/sully_kachowski [link] [comments]

How does long term, childhood trauma physically change the body? And are the effects reversible? Posted: 29 Jan 2021 06:56 AM PST submitted by /u/lackingincreativity8 [link] [comments]

How efficient is modern lighting technology (e.g. LED lighting) at converting energy to visible light? What are the factors limiting higher efficiency? Are they likely to ever be overcome? Posted: 29 Jan 2021 10:43 AM PST I tagged the question as Engineering since I'm asking about the current practical applications, but it seems to also fit Physics just as well. As a follow-up question that was too long to fit the title, what major breakthroughs are we likely to see (if any)? Anything new "just around the corner"? submitted by /u/twowheels [link] [comments]

Why do scientists listen for radio waves when looking for intelligent life? Posted: 29 Jan 2021 07:26 AM PST Wouldn't it stand to reason a species that has invented intergalactic travel would have something more advanced than radio waves? submitted by /u/DietSnapple9 [link] [comments]

Are the seemingly chaotic curves of the small intestine the same in almost everybody, like the shape of the hand, or do they follow different paths in different people? Posted: 29 Jan 2021 01:12 AM PST submitted by /u/Ummdustry [link] [comments]

About Newton’s third law... if I push a toy car and an equal and opposite reaction is exerted on my hand as I do so by the point of application of the force, wouldn’t the two forces cancel each other out and the car would remain in equilibrium? Posted: 29 Jan 2021 10:15 AM PST submitted by /u/T_Lawliet [link] [comments]

Has the impact of contracting COVID when vaccinated be studied? Until that, what are the expectaitons? Posted: 29 Jan 2021 01:56 PM PST Current COVID vaccines are not 100% efficacious—not claiming any vaccine ought to. While Pfizer/BionTech and Moderna near it with, respectively, 95% and 94.1% efficacy, other vaccines such as Astrazeneca's and JNJ get a lower efficacy, respectively, of 60-70% and 66%. The efficacy of all vaccines could be lower to COVID variants (UK variant, South Africa variant, Brazil variant), for instance Novavax which has 89% as overall efficacy, but downs to 49.4% to South African variant. The vaccines though have proved nonetheless to reduce the severity of disease, such as no vaccinated volunteer being hospitalized from COVID in Moderna's and AZ's Phase 3 trials (which may mean 100% efficacy against hospitalization). The question is, if you're in the unlucky percentage, what is expected to happen in your body if you turn positive some way to Sars-cov2? People normally affected from COVID can have mild or none symptoms to moderate/severe conditions such as pneumonia, organ's damage, low O2, blood clots, or death. Can you still develop pneumonia even if your immunity is at its best? Can you become a Covid long hauler? The impact of reducing (or eliminating) hospitalizations by the vaccines is reassuring, but more would be (for me and many other people, I suppose) knowing more about it. If for example, a different variant (like SA or Brazilian) will become dominant, mining even the best vaccines' efficacy. Or just if you're unlucky enough in your country to get able only to take a lower efficacy vaccine. submitted by /u/R0gerBlack [link] [comments]

How is a flat phone battery activated wirelessly to charge up again? Posted: 29 Jan 2021 04:50 AM PST i.e. your phone is completely dead and you place it on the wireless charging pad How does the phone 'know' the charging field is present, enough to be able to start charging? submitted by /u/turbo_dude [link] [comments]

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Is contagious yawning a cultural/learned thing or is it hardwired into us?

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• Is contagious yawning a cultural/learned thing or is it hardwired into us?
• Are there flying arthropods that aren't insects?
• Would the USA accept European approvals for Novavax (and other vaccines), or does it still require US trials?
• Can heavy rain cause the sea level to rise temporarily in that area?
• What is the fate of lipid nanoparticles in certain COVID-19 vaccines?
• What is the difference between Pathology, Pathogenicity and Pathogenesis of a virus?
• Why did Earth's rotational velocity recently increase?
• Are the new Coronavirus strains popping up meaningfully different from the original variant that saw mass infection?
• At the beginning of the vaccin trials it was said that the change for those trials to fail was very large, did any of those trials actually fail, and how much did so?
• Why do photons get absorbed and quickly expelled in the radiation zone but get absorbed and held in the convection zone?
• Are carbon dating methods reliable?
• Why do viruses make you sick ?
• What is the relationship between vomiting and brain injuries?
• Why do ion thrusters produce so little thrust?
• How is a magnetar formed compared to a neutron star?

Is contagious yawning a cultural/learned thing or is it hardwired into us? Posted: 28 Jan 2021 10:14 PM PST When I see someone else yawn it's almost automatic that I will yawn. Even just writing this made me yawn. But I've noticed that my young children don't do this. So is my instinct to yawn because there is some innate connection in human brains or is this something I do because grew up around would do it and I learned it from them? Maybe another way to ask this would be are there cultures that don't have this? (I've seen pop psychology stuff taking about psychopaths and sociopaths but doing it. That's not what I'm referring to, I mean a large majority of a group not doing it) submitted by /u/AlbinoBeefalo [link] [comments]

Are there flying arthropods that aren't insects? Posted: 28 Jan 2021 08:59 PM PST submitted by /u/DanTheTerrible [link] [comments]

Would the USA accept European approvals for Novavax (and other vaccines), or does it still require US trials? Posted: 29 Jan 2021 05:15 AM PST Are there scientific differences in how EU vs US trials are performed? Does the FDA allow this in exceptional times (like the current pandemic?) submitted by /u/crimson117 [link] [comments]

Can heavy rain cause the sea level to rise temporarily in that area? Posted: 28 Jan 2021 07:54 PM PST submitted by /u/LanaDelHeeey [link] [comments]

What is the fate of lipid nanoparticles in certain COVID-19 vaccines? Posted: 29 Jan 2021 05:24 AM PST Relatively little attention seems to be given to the lipid nanoparticle formulations when discussing the safety and efficacy of the new mRNA vaccines. It would seem the lipid nanoparticles are needed to make an efficacious vaccine, but what do we know about the short and long-term fate of these lipid nanoparticles inside the human body? submitted by /u/a_sesquipedalian [link] [comments]

What is the difference between Pathology, Pathogenicity and Pathogenesis of a virus? Posted: 29 Jan 2021 03:50 AM PST submitted by /u/middle98 [link] [comments]

Why did Earth's rotational velocity recently increase? Posted: 28 Jan 2021 07:47 PM PST I keep reading that we're thinking of taking away the "Leap Second" this year because Earth's velocity increased in 2020, but I'm seeing little explanation for why that might occur. Some super large rock formation moving around in the lower mantle? Some weird phenomenon in the core? What are the most plausible explanations? submitted by /u/HybridVigor [link] [comments]

Are the new Coronavirus strains popping up meaningfully different from the original variant that saw mass infection? Posted: 28 Jan 2021 06:34 PM PST Afaik it's commonly accepted in the scientific community that over time pathogens typically become more and more mild. The idea being that you want to still infect your host, as that is essential for survival, but the more you disrupt their ability to survive the less likely you are able to spread and thus survive yourself. In humans there is also the added pressure to evolve this way because we actively combat severe pathogens but don't to nearly the same extent with the more mild ones. A good example of this effect would be something like a common cold. Beyond just being physically different from their ancestor, how are the new strains popping up around the world different? Are they less/more lethal? Less/more infectious? Cause more/less long-term damage? I'm quite curious to see if the phenomenon I described is occuring within the COVID-19 virus, essentially, and if this rule-of-thumb in Pathology is observable in this specific instance. submitted by /u/Mdrogun [link] [comments]

At the beginning of the vaccin trials it was said that the change for those trials to fail was very large, did any of those trials actually fail, and how much did so? Posted: 29 Jan 2021 02:03 AM PST At the start of the vaccin trails I read many times on reddit that the chance for the trials to fail is larger than success. But since then I haven't heard of any failed trials and cancelled vaccin research. Were there any vaccine researches that were cancelled? And how is it possible that the most talked about vaccin researches all succeeded? Were the numbers people gave at the beginning regarding the chance of such trials to fail false? (Sorry for bad formulation, English is not my first language) submitted by /u/Sophie_333 [link] [comments]

Why do photons get absorbed and quickly expelled in the radiation zone but get absorbed and held in the convection zone? Posted: 28 Jan 2021 07:24 PM PST I am talking about stars here. Photons are generated in the core and then get emitted and then get absorbed and expelled by nuclei and protons in the radiation zone, however once it reaches the convection zone then it gets absorbed and the energy stays with the particle until it hits the surface. I am wondering why this happens. submitted by /u/Broooooo12345 [link] [comments]

Are carbon dating methods reliable? Posted: 28 Jan 2021 07:42 PM PST Hello everyone. I'm new to this subreddit, but I have a question. Is carbon dating reliable? I have heard many rebuttals from young earthers who claim things such as: *water (a flood) tampers with carbon dating methods *rocks where we know the age (i.e formed in an eruption or lab made) date millions of years old *carbon levels were not always the same I am not a scientist, so this video has me stumped. Any and all answers are appreciated. Thanks! https://youtu.be/fg6MfnmxPB4 submitted by /u/klauver [link] [comments]

Why do viruses make you sick ? Posted: 28 Jan 2021 09:33 AM PST The only goal of a virus is to multiply. Making you sick does not help that goal. Killing the host will kill all the virus in it also. So why have most viruses not evolved to harmlessly enter their hosts? submitted by /u/muffireddit2 [link] [comments]

What is the relationship between vomiting and brain injuries? Posted: 28 Jan 2021 08:45 PM PST Traumatic brain injuries have vomiting as one of their possible symptoms. What is it about brain injuries that trigger vomiting? submitted by /u/Benjips [link] [comments]

Why do ion thrusters produce so little thrust? Posted: 28 Jan 2021 08:51 PM PST What law of physics forbid it from having higher thrust? submitted by /u/Gabriel38 [link] [comments]

How is a magnetar formed compared to a neutron star? Posted: 28 Jan 2021 01:26 AM PST So I think understand that a magnetar is a form of neutron star and both are created by the collapse of a larger type of star, but what causes one to be a magnetar specifically? Is it related to the entropy of that specific star car similar to what I was reading in a previous post? Or is there something I'm completely misunderstanding? submitted by /u/karbon91 [link] [comments]

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What does "Entropy" mean?

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• What does "Entropy" mean?
• AskScience AMA Series: I am Avi Loeb and I'm here to explain how I noticed the first tentative sign for Intelligent life beyond earth. AMA!
• When astronomers refer to distances between galaxies, do they mean the distance as we observe them or as they are now?
• Do older people vaccinated for Covid have a “good” immune response from it?
• If all electrons are identical, then how can they have different energy levels?
• Do gravitional waves effect time?
• How does an increase in humidity assist plant growth?
• How laser measuring tools work?
• Do all vaccines get tested for sterilising immunity?
• With sunglasses on, one of my computer monitors is almost unaffected, only slightly darker, and the other one turns entirely black. What about monitors or sunglasses makes them react differently?
• Optics/Eye anatomy: How *exactly* does the eye perceive the color green from a mixture of yellow and cyan pigments on a white sheet of paper?
• Why do infected cases grow in waves during a pandemic?
• What causes the steams different behaviour?
• Are the current COVID-19 vaccines not as effective for certain races?
• Is it possible to store video data as a photo?
• I'm watching Fritz Lang's 1931 silent film "Woman in the Moon" and they got surprisingly accurate with some of the science of orbital mechanics. When (and who) calculated the physics of spaceflight to the moon?

What does "Entropy" mean? Posted: 27 Jan 2021 02:20 PM PST so i know it has to do with the second law of thermodynamics, which as far as i know means that different kinds of energy will always try to "spread themselves out", unless hindered. but what exactly does 'entropy' mean. what does it like define or where does it fit in. submitted by /u/bert_the_destroyer [link] [comments]

AskScience AMA Series: I am Avi Loeb and I'm here to explain how I noticed the first tentative sign for Intelligent life beyond earth. AMA! Posted: 28 Jan 2021 06:12 AM PST I am the Frank B. Baird, Jr., Professor of Science at Harvard University. I received a PhD in Physics from the Hebrew University of Jerusalem in Israel at age 24, while leading the first international project supported by the Strategic Defense Initiative (1983-1988). Subsequently I was a long-term member of the Institute for Advanced Study at Princeton (1988-1993). Throughout my career, I have written 8 books, including most recently, Extraterrestrial (Houghton Mifflin Harcourt, 2021), and about 800 papers (with an h-index of 112) on a wide range of topics, including black holes, the first stars, the search for extraterrestrial life and the future of the Universe. I had been the longest serving Chair of Harvard's Department of Astronomy (2011- 2020), Founding Director of Harvard's Black Hole Initiative (2016-present) and Director of the Institute for Theory and Computation (2007-present) within the Harvard-Smithsonian Center for Astrophysics. I also chair the Board on Physics and Astronomy of the National Academies (2018-present) which oversees all Decadal Surveys in Physics and Astronomy. I am an elected fellow of the American Academy of Arts & Sciences, the American Physical Society, and the International Academy of Astronautics. In addition, I am a member of the President's Council of Advisors on Science and Technology (PCAST) at the White House and a member of the Advisory Board for "Einstein: Visualize the Impossible" of the Hebrew University. I also chairs the Advisory Committee for the Breakthrough Starshot Initiative (2016-present) and serve as the Science Theory Director for all Initiatives of the Breakthrough Prize Foundation. In 2012, TIME magazine [pdf] selected me as one of the 25 most influential people in space and in 2020 I was selected among the 14 most inspiring Israelis of the last decade. Click here for my commentaries on innovation and diversity. I will be on at 11a.m. EST (16 UT), AMA! Username: /u/Avi-Loeb submitted by /u/AskScienceModerator [link] [comments]

When astronomers refer to distances between galaxies, do they mean the distance as we observe them or as they are now? Posted: 27 Jan 2021 11:20 PM PST For example, if astronomers describe the distance between two galaxies in a supervoid that is a billion light-years away to be 150 million light-years. Is that distance representative of what we have observed (essentially an image from a billion years ago) or as it is now (accounting for the expansion of the universe)? submitted by /u/stuffdude99 [link] [comments]

Do older people vaccinated for Covid have a “good” immune response from it? Posted: 28 Jan 2021 05:18 AM PST My otherwise very healthy and independent 94yo grandmother received her first Covid vaccine 5 days ago. I asked her if her arm was as sore as mine and she said it doesn't hurt at all. I was wondering if the immune response in the older population has been studied much. I'm just curious if her complete lack of side effects is an indication that her body did not get a strong immune response. submitted by /u/BRCRN [link] [comments]

If all electrons are identical, then how can they have different energy levels? Posted: 28 Jan 2021 06:33 AM PST I've heard that the farther an electron is from the nucleus, the more energetic it is. But how can this be if all electrons are identical? submitted by /u/imgoingdef [link] [comments]

Do gravitional waves effect time? Posted: 27 Jan 2021 09:47 PM PST Since gravitional waves are ripples in space-time, how do they effect the time component? Is there any kind of time dilation? submitted by /u/RigbyAtNight [link] [comments]

How does an increase in humidity assist plant growth? Posted: 27 Jan 2021 11:14 PM PST For many indoor plants that have evolved to live in more humid environments, it appears that reducing humidity levels can impair their growth. Why is this? Given that an increase in humidity decreases the rate of transpiration and thus slows nutrient uptake from the soil, why would they grow faster? submitted by /u/Fartfenoogin [link] [comments]

How laser measuring tools work? Posted: 27 Jan 2021 07:23 PM PST Ultrasound space measuring works by measuring the time it takes to a sound wave go, reflect and return to the tool. But we cant really measure the speed of light cuz it is too fast to be detected, so laser measuring tools can't work like ultrasound tools. So how does it work? submitted by /u/MCarooney [link] [comments]

Do all vaccines get tested for sterilising immunity? Posted: 27 Jan 2021 03:11 PM PST People are saying that we don't know if the new COVID vaccines will affect transmission of COVID. Every other vaccine I heard of stops transmission of whatever they're vaccinating against, so I don't understand why this would be different. However, if they all need to be tested for this I would understand, as it would then just be a routine question. Do all vaccines need to be specifically evaluated for sterilising immunity, or is this something we're only worried about with the new vaccines? submitted by /u/namedbymybrother [link] [comments]

With sunglasses on, one of my computer monitors is almost unaffected, only slightly darker, and the other one turns entirely black. What about monitors or sunglasses makes them react differently? Posted: 27 Jan 2021 02:30 PM PST submitted by /u/dihydrogen9monoxide [link] [comments]

Optics/Eye anatomy: How *exactly* does the eye perceive the color green from a mixture of yellow and cyan pigments on a white sheet of paper? Posted: 27 Jan 2021 02:18 PM PST Thanks in advance for entertaining my very basic question. Here's what I think I know so far: White light shines from a light source and hits the cyan and yellow pigments. The pigments reflect the wavelengths that correspond to cyan (ca 475nm) and yellow (ca 580nm) respectively, and absorb the rest. The "cyan" and "yellow" wavelengths then enter the eye. If the above is correct, does that mean that the tristimulus values of spectral green and cyan+yellow are the same, like in the case of yellow and green+red? Apologies if this is a dumb question. I think my confusion comes in part from trying to figure how additive and subtractive color models fit in the real world. Would it be accurate to say that subtractive color is a part of physical reality, while additive color exists only as a part of human perception? Bonus question: I understand that in reality a blue object does reflect other wavelengths besides "blue" ones, albeit at a lower intensity. But are there chemicals or chemical structures that manage to exclusively reflect an incredibly narrow range of wavelengths (say, 500-505nm), without reflecting any other wavelengths at any degree of intensity? Thank you for your time! submitted by /u/Grain_in_a_Jar [link] [comments]

Why do infected cases grow in waves during a pandemic? Posted: 27 Jan 2021 11:04 AM PST At the beginning of the coronavirus pandemic they kept telling us on the news about how it would come in waves, and from looking at regional charts, it really has happened in waves. Is that because of human behavior or something to do with the virus itself or what? Edit: to clarify my question, if we didn't do lockdowns, didn't have holidays, or other human type of social behavior changes, would we still see the disease spread in waves? submitted by /u/mntgoat [link] [comments]

What causes the steams different behaviour? Posted: 27 Jan 2021 11:02 PM PST Why is it that the steam coming from outside into my bathroom, through my window, is falling to the floor, whilst the steam coming from inside the shower cubicle rises to the ceiling? PS: I'm not sure which category this is, but I believe it's physics submitted by /u/Kasper_II [link] [comments]

Are the current COVID-19 vaccines not as effective for certain races? Posted: 27 Jan 2021 04:45 PM PST I just read an article from MIT that said the immune response was not as strong in people with certain genetic backgrounds (they specifically mentioned Asians). I don't understand the science behind the research. Is this a concern? If so, can the drug manufacturers improve the vaccines? submitted by /u/bob_ross_happy_tree [link] [comments]

Is it possible to store video data as a photo? Posted: 27 Jan 2021 09:45 PM PST This probably sounds like a dumb pointless question and I'm sorry if this isn't the right sub to be asking this sort of thing. I know there are ways of making sounds into images and vice versa, like using SSTV image generators and decoders for example. I was wondering if there is a way you can take the digital video data from a video and save it or transform it into a single picture? Hopefully this makes sense. submitted by /u/Awkwarddruid [link] [comments]

I'm watching Fritz Lang's 1931 silent film "Woman in the Moon" and they got surprisingly accurate with some of the science of orbital mechanics. When (and who) calculated the physics of spaceflight to the moon? Posted: 27 Jan 2021 01:28 AM PST Outside the whole "we can breathe on the moon" aspect, the 1931 silent film surprised me with the accuracy of the spaceflight facts a decade or two before the big rocket programs: "we will land 36 hours later on the far side of the moon" "necessary speed of 11,200 meters per second" (escape velocity) The need to cut the rocket motors or speed past the moon. 8 minutes of acceleration, then at 227,00km above Earth, coasting, and weightlessness. Kepler and Newton advanced planetary mechanics and Halley famously applied that to his comet, but I can't seem to find info on the first to figure out spaceflight parameters for a flight to the moon. (Probably just flubbing search terms late at night.) submitted by /u/westtxfun [link] [comments]

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