When tissue is grafted, how do the blood vessels in the graft find and connect to the blood vessels in the graft site?

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• When tissue is grafted, how do the blood vessels in the graft find and connect to the blood vessels in the graft site?
• Will corona prevention measures have a lasting impact on generic influenza / flu?
• Why don't ripples in a pond propogate at the speed of sound?
• Why does fish smell fishy?
• How can colors be inverted?
• COVID and Head Lice reduction?
• How is genetic distance measured?
• What makes a metal or plastic foil crackle when it is bent or crumpled?
• How are satellites electronically grounded?
• PCR tests are both dye and probe based. With dye thats added that binds to double-strand DNA. How does dye know which bit of double stranded DNA to bind to?
• What is the plan for extracting energy for nuclear fusion?
• Why haven't vaccine gummies been made?

When tissue is grafted, how do the blood vessels in the graft find and connect to the blood vessels in the graft site? Posted: 01 Feb 2021 10:05 PM PST I recently got a gum graft where connective tissue from the roof of my mouth was grafted into the gums on my lower teeth. How did my graft get "plugged back into" the blood supply? How long would it have taken for the capillaries to have connected, and what is the specific mechanism by which them lil' blood pipes found each other? submitted by /u/shadowplumber [link] [comments]

Will corona prevention measures have a lasting impact on generic influenza / flu? Posted: 02 Feb 2021 01:50 AM PST So, most of the world is following social distancing, heavy lockdowns, mask wearing and washing hands, and influenza has all but been eradicated by now as a result. Assuming that the lockdown and preventive measures will end some time in 2022 (I'm not too optimistic with vaccination plans), people won't have caught the various influenza / flu strains at all for two years in a row. Are there even enough "reservoir hosts" in which the strains could have lived on for these two years? And will the human bodies react more intense on strains that would have been "harmless" in 2018, simply because they haven't had to fight against flu for two years? submitted by /u/mschuster91 [link] [comments]

Why don't ripples in a pond propogate at the speed of sound? Posted: 02 Feb 2021 06:22 AM PST The title says it all. Pressure waves in air propogate in all directions at about 340 m/s. Sound travels faster in water, why dont dont we see evidence of this when we throw a rock into a pond? submitted by /u/ManlyMcBuff [link] [comments]

Why does fish smell fishy? Posted: 01 Feb 2021 10:30 AM PST submitted by /u/Girlc0 [link] [comments]

How can colors be inverted? Posted: 01 Feb 2021 07:32 PM PST Was thinking about this the other day: the visible color of something is dependant upon what wavelength of light it is emitting, so how can colors be "inverted"? (ie red is the inverse of blue, yellow is the inverse of purple etc) I was thinking of the spectrum of light like a number line, and felt like it didn't make sense. It would be like saying arbitrarily that 4 was the inverse of 6. I understand white being inverse of black; white being all colors, black being the absence of color. Also, never understood in electronics class how if you swapped the polarity of certain LEDs they'd change from red to green. submitted by /u/DrBobvious [link] [comments]

COVID and Head Lice reduction? Posted: 01 Feb 2021 11:24 AM PST With people social distancing and schools being virtual I guess that the number of cases of head lice has been reduced. Could head lice be eradicated by people distancing from COVID's effects? submitted by /u/bephens [link] [comments]

How is genetic distance measured? Posted: 01 Feb 2021 11:20 AM PST i.e. Like when biologists say that humans share whatever % of our genome with chimpanzees or whatever, Does it literally go through every base pair and take the number of differences divided by the overall length or is there some other method? submitted by /u/shosuroyokaze [link] [comments]

What makes a metal or plastic foil crackle when it is bent or crumpled? Posted: 01 Feb 2021 12:14 PM PST What exactly produces these sounds? submitted by /u/Walambo [link] [comments]

How are satellites electronically grounded? Posted: 01 Feb 2021 07:15 AM PST My understanding of regular electronics is that the Earth is used as a charge "sink" so that any circuit can be grounded, with that node acting as a reference O volt point. On a satellite however, what acts are the charge sink? There presumably needs to be a common ground location for the on board electrics to work correctly. Is the charge somehow distributed into space Otherwise, is it possible for the spacecraft to constantly build up charge? I feel like this would introduce complications for the many sensitive electronic components on board. submitted by /u/Player_Found [link] [comments]

PCR tests are both dye and probe based. With dye thats added that binds to double-strand DNA. How does dye know which bit of double stranded DNA to bind to? Posted: 01 Feb 2021 07:52 AM PST It's my understanding that the presence of this dye when amplified results in a positive as the dye bound to the ie. Covid 19 Are they testing for the presence of the virus, or the presence of the dye? I've read that probe PCR is more accurate. Could dye bind to other double stranded DNA in the sample? submitted by /u/prayingfordebbie [link] [comments]

What is the plan for extracting energy for nuclear fusion? Posted: 01 Feb 2021 10:35 AM PST With some of the recent breakthroughs in sustained fusion, specifically the recent one that was able to go for about 20 seconds, I was wondering about how it will be useful to humanity. How will energy be extracted from the process? Will it be indirect energy transfer like nuclear fission where the reactors heat water to turn turbines? Photovoltaic cells surrounding the reactor? Something else? Right now it seems that the language is so focused on if we can do it that it doesn't mention how it will be useful. submitted by /u/physicist314 [link] [comments]

Why haven't vaccine gummies been made? Posted: 01 Feb 2021 11:59 PM PST submitted by /u/rampagejester1897 [link] [comments]

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If you dug a hole straight down to the other side of the earth, what would happen if you dropped something through it?

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• If you dug a hole straight down to the other side of the earth, what would happen if you dropped something through it?
• How do we know if sound cames from behind or from front?
• What gives a steel cable so much more tensile strength than a steel rod?
• How did people find out about the Earth’s core and if other planets have a core?
• Is the extra 1 mg in a dose of aspirin really necessary?
• How did Avogadro find his number/constant?
• Why are Covid tests least accurate when you’re most contagious?
• How does the asymptomatic rate of coronavirus compare to other illnesses?
• Do Microbiologists build immunity to laboratory organisms?
• How is the time energy uncertainty principal related to calculating energies?
• How concerned should we be about potential ADE with future mutations of SARS-CoV-2?
• Before the discovery of surgery to sepaetae them, how did conjoined twins coexist?

If you dug a hole straight down to the other side of the earth, what would happen if you dropped something through it? Posted: 01 Feb 2021 03:44 AM PST This is pretending there's no core or anything of that matter that would effect it. How would gravity effect it? What would happen? Would it get stuck in the middle, would it gain enough velocity to shoot out the other side? submitted by /u/Tight-Start1795 [link] [comments]

How do we know if sound cames from behind or from front? Posted: 01 Feb 2021 04:32 AM PST We have two ears, so sound going from left or right is slightly delayed in one ear. I believe this is how we can recognize if sound comes from right or left side. But how can one say if sound comes from front or behind? submitted by /u/uniqiq [link] [comments]

What gives a steel cable so much more tensile strength than a steel rod? Posted: 31 Jan 2021 09:31 AM PST submitted by /u/DarkStarStorm [link] [comments]

How did people find out about the Earth’s core and if other planets have a core? Posted: 31 Jan 2021 01:23 PM PST I'm just wondering because the Earth's core is really deep down that nobody can get to it so I'm wondering how people found out there's a core. Also I know some planets have one and other planets don't but how did scientists find out about them? Also what would happen if the Earth's core somehow got put out? I'm just really curious about it and it was a topic my friends were talking about and it was interesting! I'd love any answers/explanations thank you! 💕 submitted by /u/Virgo_moons [link] [comments]

Is the extra 1 mg in a dose of aspirin really necessary? Posted: 01 Feb 2021 02:39 AM PST I'm an EMT. Part of our protocol for chest pain is 324mg baby aspirin PO, which is broken down into four 81 mg tablets. Does that extra milligram make a substantial difference? Why not just make it an even 80/320 mg? I've asked my paramedic partner, who has thirty years experience, and he couldn't really tell me anything, and neither could google. This is something I've been wondering for a while now. TYIA submitted by /u/white_mage_dot_exe [link] [comments]

How did Avogadro find his number/constant? Posted: 31 Jan 2021 10:15 PM PST It greatly baffles me. Also how does that number apply to all atoms/ions/molecules? Or does it even? submitted by /u/candyflora [link] [comments]

Why are Covid tests least accurate when you’re most contagious? Posted: 31 Jan 2021 11:28 AM PST According to Harvard Health, "the rate of false negatives... varies depending on how long infection has been present: in one study, the false-negative rate was 20% when testing was performed five days after symptoms began, but much higher (up to 100%) earlier in infection" (source 1). So molecular tests are least effective when you first show symptoms, however other studies find people are most contagious during the first five days. "A study published yesterday in The Lancet Microbe shows that COVID-19 is most contagious in the first 5 days after symptom onset" (Source 2). How is this possible? Source 1: https://www.health.harvard.edu/blog/which-test-is-best-for-covid-19-2020081020734 Source 2: https://www.cidrap.umn.edu/news-perspective/2020/11/covid-19-most-contagious-first-5-days-illness-study-finds submitted by /u/jonas4sberg [link] [comments]

How does the asymptomatic rate of coronavirus compare to other illnesses? Posted: 31 Jan 2021 04:24 PM PST How does the asymptomatic rate of coronavirus compare to other illnesses ? submitted by /u/Sheepherder_Nearby [link] [comments]

Do Microbiologists build immunity to laboratory organisms? Posted: 31 Jan 2021 02:24 PM PST Do microbiologists that work in close proximity to harmful organisms build immunity to them? submitted by /u/OptimisticLosers [link] [comments]

How is the time energy uncertainty principal related to calculating energies? Posted: 31 Jan 2021 10:29 PM PST Say a particle is "created" somehow. Does that mean that the time energy uncertainty principle states that the variance in E decreases? Also, does that mean that if this created particle is put into an infinite square well that it will not have definite energy in a particular eigenstate, but that the variance of the energy will tend to zero as time goes on? submitted by /u/CheekyCheetah1 [link] [comments]

How concerned should we be about potential ADE with future mutations of SARS-CoV-2? Posted: 31 Jan 2021 09:20 AM PST Should we be concerned that future mutations might completely evade the current vaccines, or worse that antibodies from vaccines (or natural infection) might trigger antibody-dependent enhancement with future variants? Should we be concerned that vaccines and antibody treatments might actually pressure the virus to evolve that way? There is some suspicion that the UK variant was "brewed" in a patient who received antibody treatment (virological.org link below) https://virological.org/.../preliminary-genomic.../563 https://www.nature.com/articles/d41586-021-00149-1 https://www.biorxiv.org/.../10.1101/2020.12.18.423358v1.full https://www.medrxiv.org/.../2020.10.08.20209114v1.full-text submitted by /u/daviddem [link] [comments]

Before the discovery of surgery to sepaetae them, how did conjoined twins coexist? Posted: 30 Jan 2021 09:46 PM PST submitted by /u/_aa___ [link] [comments]

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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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