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Wednesday, March 3, 2021

What controls the production of ear wax?

What controls the production of ear wax?


What controls the production of ear wax?

Posted: 02 Mar 2021 08:01 PM PST

Are vaccines preventative only? Are there any diseases that can be cured by administering their respective vaccine? What's the case for COVID-19?

Posted: 02 Mar 2021 04:55 PM PST

From my little knowledge about biology I know vaccines are given before you get infected with a disease so that your body already has the respective antibodies in case you do get infected. Are there any vaccines that can be given when the person is ill already? To help maybe boost the process of making antibodies. Additionally can the COVID-19 vaccine be given to people already suffering from the virus? Will there be any ill effects?

submitted by /u/dreamylucifer
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If we can vaccinate chickens against salmonella, why haven’t we done the same for humans?

Posted: 03 Mar 2021 06:25 AM PST

Could we eliminate the Flu if we all got vaccinated for the flu and wore masks during flu season?

Posted: 03 Mar 2021 04:45 AM PST

Masks have been pretty effective at keeping my family healthy this year and I was wondering if some viruses like the flu are so endemic that there will always be substantial spread, or if mask use would be effective at isolating or eliminating the flu?

submitted by /u/FrebTheRat
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AskScience AMA Series: Hi! I am Tel Aviv University cancer biologist, Prof. Neta Erez. I'm developing a novel approach to treating breast cancer. Ask Me Anything!

Posted: 03 Mar 2021 04:00 AM PST

Hi! I am Tel Aviv University cancer biologist, Prof. Neta Erez. I study the tumor metastasis microenvironment.

Tumors are more than just a bunch of cancer cells. They are better described as multicellular organisms. In each tumor there are complex interactions with immune cells, which cause inflammation processes in the connective tissue and blood vessels.

In my lab, we study these interactions to understand how tumor cells "hijack" physiological pathways and use them to support their growth. Additionally, we also study the link between cancer and inflammation,specifically how cancer cells metastasize and grow in distant organs from their original host.

Prof. Erez studies the biology of tumor metastasis, focusing on the metastatic microenvironment, cancer-related inflammation and the role of stromal and immune cells in facilitating the early and late stages of metastasis. Prof. Erez's work focuses on these crucial aspects of cancer. She uses mouse models of carcinogenesis and metastasis of melanoma, breast, and ovarian carcinoma. The main goal of her research is to identify and characterize key molecular pathways in the communication between tumor cells and their microenvironment that can be targeted by novel therapeutics.

Prof. Erez began her academic career at the Weizmann Institute of Science. She obtained her PhD in the field of molecular cell biology under the guidance of Prof. Varda Rotter. Supported by a fellowship from the Cancer Research Institute (CRI), Prof. Erez carried out her postdoctoral research in the laboratory of Prof. Doug Hanahan at UCSF, working in the field of tumor biology (2005-2010). During her postdoctoral fellowship she demonstrated a novel role for cancer-associated fibroblasts in mediating tumor-promoting inflammation. Following her postdoctoral work, she joined the Department of Pathology at the Sackler Faculty of Medicine in October 2010, and currently serves as the Department Chair.

I will be on at 10am PT (1 PM ET, 18 UT), Ask Me Anything!

Learn more about my lab: https://www.netaerezlab.sites.tau.ac.il/

Username: /u/IsraelinSF


EDIT: Please note the correction in time.

submitted by /u/AskScienceModerator
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Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science

Posted: 03 Mar 2021 07:00 AM PST

Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Physics, Astronomy, Earth and Planetary Science

Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...".

Asking Questions:

Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists.

Answering Questions:

Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience.

If you would like to become a member of the AskScience panel, please refer to the information provided here.

Past AskAnythingWednesday posts can be found here. Ask away!

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Why is the protective factor of covid vaccines and immunity through previous infection different?

Posted: 03 Mar 2021 05:46 AM PST

Im Brazillian and im a health professional, so im almost embarassed of asking this, but i was reading about our new p.01 covid 19 mutation, and it has been demonstrated that it can dodge with more efficiency the natural immunity that we get after being infected by a non p.01 mutation of covid19, but it doesnt seem to behave the same way in vaccinated people.
What im wondering is: if a vaccine with a weakened virus just triggers a complete immune response and it follows by immunity, just not the severe symptoms that come with the infection, why does it differ from the natural immune response from having a full infection? I mean, it should be the same protection for both natural infection and weakened virus vaccines, if im assuming the same mechanisms are in action, shouldnt it?
I had only one semester in immunology, but this has been bugging me for a few days now.
if i wasnt clear in my question im sorry, i will try to clarify, my english is a little rusty.

submitted by /u/Hypnotic_Mind
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Should I still get the COVID vaccine if I’ve already had COVID?

Posted: 03 Mar 2021 01:50 AM PST

If the purpose of a vaccine is to stimulate antibodies as if you were exposed to the disease that you're being vaccinated for, then why should people who have already had COVID still get the vaccine?

submitted by /u/Chibaglover
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In adenovirus vaccines, like the Johnson and Johnson vaccine, how do they get the right DNA inside the viruses?

Posted: 02 Mar 2021 02:31 PM PST

What processes do they use to insert the DNA? And how do they manufacture large quantities of them?

submitted by /u/Hack_the_Gibson
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Can we predict earthquake aftershocks, and if yes, with how much accuracy?

Posted: 03 Mar 2021 04:13 AM PST

Is carbon fiber a heat conductor or a heat insulator?

Posted: 03 Mar 2021 12:25 AM PST

No matter how much I google, I keep getting constantly contradicting results on the thermal conductivity of carbon fiber. Some say that since it has low thermal conductivity that it's an insulator, but I keep constantly seeing other contradictory remarks about it having a lot of potential for heat conductivity, so if anyone can clarify I'd appreciate that.

submitted by /u/ReluctantCucky
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Does the shape of our skulls change over the course of our life from things like sleeping on one side more or leaning against hard surfaces?

Posted: 03 Mar 2021 01:18 AM PST

Say you like to sleep on your left side more often than your right, would that side of the skull eventually have the slightest indentations from being placed against surfaces for a prolonged period of time?

If yes, can you detect these indentations from excavated skulls and make scientific assumptions from them?

submitted by /u/LightShadowMC
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How were ‘eye floaters’ viewed prior to knowledge of the eye’s structure?

Posted: 02 Mar 2021 11:33 PM PST

Is there a change in carbon concentration with altitude?

Posted: 02 Mar 2021 10:19 PM PST

Have we observed a difference in carbon concentration at ground level, 1 km and 100 km? And if so by how much does it change?

submitted by /u/glakshya02
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Is it posible to have two invisible light beams combine and form a visible spot on the wall? (to the naked human eye at least)

Posted: 02 Mar 2021 05:05 PM PST

Hello guys,

Let me try to be more clear on my question. With invisible light beam i mean a light with a waveform not in the visible spectrum of human eyes, could be infrared or ultraviolet not dangerous to us, but when combined with other light beam that has a slightly different waveform make a visible spot in a wall or in a surface they hit.

One light by itself of course wont be visible to us. But is there any combination of short/long wavelenght lights that when combined become visible to the human eye? If you guys imagine it as laser lights it might make more sense.

I made a crappy drawing but it might help me explain more.

here is the link: https://imgur.com/I8R8K19

Thanks a lot in advance!!!

submitted by /u/InformalAttempt9
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Is there a shape that would create no sonic boom?

Posted: 02 Mar 2021 12:30 PM PST

I guess this question has two facets, weather the object is self propelled or not (bullet or rocket)

The mass shouldn't be 0, otherwise what's the point.

Mach 1

That's all I can think of.

submitted by /u/hugo_bauer
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How is the J&J vaccine able to only get away with one dose while still being highly effective?

Posted: 02 Mar 2021 09:43 AM PST

All other vaccines are two doses. That includes different types of vaccines such as the mRNA ones (Pfizer and Moderna), the protein ones (Novavax), but even the similar adenovector ones (Astra Zeneca).

How is it that J&J has been able to make a single dose vaccine that is so effective? The other adenovector ones use two doses, so why is the J&J adenovector vaccine any different? I've learned more about immunology in this pandemic, and my understanding is that the second dose helps refine that initial subset of antibodies to greater affinity, as well as create a stronger memory response to prevent re-infection. It seems the J&J vaccine has resolved concern on the first point (the antibodies are definitely strong), but what about the second point (the second dose reinforces the long term memory response)? Is there not still a very real concern that the immunity won't last longer than 6 months or so?

submitted by /u/orangeboomerang
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Is it possible to build a big optical telescope with aperture synthesis, like radio telescopes?

Posted: 02 Mar 2021 12:23 PM PST

All the current satellite telescopes are single big pieces of machinery, they are expensive to build and when they fail - they fail completely.

Is it possible to build a lot of smaller telescopes and have them connect in some way on orbit to synthesize images?

Even if these telescopes need to be connected mechanically to be a one big structure, I think it still can be beneficial to have an aperture size of a hundred or two hundred meters. And if you want to make a bigger telescope - "just" build another batch of the same hardware, launch and connect on orbit to existing structure.

I understand it's not easy, but in principle could be easier than building a really big new one-off telescope for more than a decade, spending many billions on it (e.g. JWST).

submitted by /u/Murkt
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Function of a steroid response complex binding to a steroid response element (SRE)?

Posted: 02 Mar 2021 12:31 PM PST

Hi all,

Please excuse me if this is a dumb question, but:

During my studies, my textbook outlines that when a sex steroid (such as androgens) binds to a receptor, it creates a steroid-receptor complex that can bind to specific DNA sequences in chromatin, also known as steroid response elements (SREs). However, my textbook doesn't highlight why a sex steroid would need to bind to DNA.

What role does this play in the overall conformation of DNA? Does the complex affect replication/transcription? And if yes, why would it need to do so? Does it affect hormonal levels/production within the body?

I tried googling this, but was unable to locate an answer for it as it's really a finicky question.

Many thanks in advance.

submitted by /u/cowjk
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What are the risks of delaying the second dose of the COVID vaccines beyond manufacturer's guidelines?

Posted: 02 Mar 2021 12:04 PM PST

British Columbia (Canada) just announced an aggressive plan to get all residents their first dose by the end of July. In order to reach this goal, they also announced delaying the second dose for up to four months.

Huffington Post Article

submitted by /u/Crakkerz79
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Tuesday, March 2, 2021

If cases were lower with Coronavirus, would that mean less variants?

If cases were lower with Coronavirus, would that mean less variants?


If cases were lower with Coronavirus, would that mean less variants?

Posted: 01 Mar 2021 05:06 PM PST

& would it be easier to fight?

submitted by /u/IeatBehrs
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AskScience AMA Series: I'm Herman Pontzer, an anthropologist and professor at Duke University. My new book, BURN, shares new research on how the human metabolism really works so that we can finally improve health and manage weight. AMA!

Posted: 02 Mar 2021 04:00 AM PST

Hi Reddit! I'm Herman Pontzer, PhD, Associate Professor of Evolutionary Anthropology at Duke University and Associate Research Professor of Global Health at the Duke Global Health Institute. I conduct research on the human metabolism through studies with hunter-gatherer tribes like the Hadza in Africa.

In my decade of study in this field, what I've learned challenges the consensus of the diet and exercise industry. We've always been told that exercise increases the number of calories we burn each day, but a doubly labeled water study with the Hadza conducted by me and my research team shows that our bodies have evolved to adjust to our daily level of physical activity, thereby adjusting our metabolism to keep daily energy expenditure within a narrow range, regardless of how active we are. Instead, the key to losing weight and battling the obesity pandemic is regulating the number of calories we consume versus how many we burn. That's not to say we should abandon exercise - it is essential to keeping our bodies healthy and to aging well - but diet is the tool we need to focus on to manage our weight.

My new book, BURN, examines this exciting research taking place outside of traditional labs and reveals how a new understanding of our metabolism can inform our efforts to promote a healthy and sustainable society.

If you're curious about why we can't "earn" that slice of chocolate cake, whether a Paleo diet is actually "Paleo," what the Hadza can teach us about avoiding diseases of civilization like diabetes and obesity, or what it's like to extract a live tick from your head while observing chimpanzees (true story), I am here for it. I am on at 3pm EST (20 UT), AMA!

Username: /u/HermanPontzer

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Does exposure to covid increase immunity for already vaccinated people?

Posted: 02 Mar 2021 01:25 AM PST

So, given that we know a 2nd dose of the vaccine boosts immunity, even in the Johnson & Johnson single dose vaccine. What can we say/speculate about how a vaccinated person's level of protection/immunity might increase after exposure to the virus? Is this further exposure, which could be asymptomatic, or is very unlikely to be a case of severe illness, likely to increase immunity?

submitted by /u/idiosynkratique
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What is the R value for asymptomatic Covid compared with symptomatic?

Posted: 02 Mar 2021 03:09 AM PST

The viral load would be less as symptoms such as coughing come from damaged alveoli that rupture through the amount of viruses inside them so surely you are less contagious.

submitted by /u/BareHench
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Are all planets spherical?

Posted: 02 Mar 2021 06:08 AM PST

Would non-spherical objects, even of larger size, have such odd gravitational forces that they would not orbit around a sun?

submitted by /u/Et3rna1Sunshine
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Why is there no such thing as x-ray or gamma ray goggles like their are night vision goggles (infra-red)?

Posted: 02 Mar 2021 05:01 AM PST

How are limbs reattached during surgery? Wouldn't clots form at the site of reconnected blood vessels? How do nerves neurons "reconnect" if they can't multiply?

Posted: 01 Mar 2021 06:54 PM PST

A few questions regarding replantation / anastomosis / reattaching a Limb such as an arm (PS. what is the proper term?) . From my understanding, it's generally done in steps (bones, vessels, nerves, skin, etc)

I remember learning in anatomy that neurons can't multiply/divide/differentiate in a mature nervous system, unlike neuroglia (was doing a compare/contrast at the time). If that is the case, why can nerves be reattached and function properly? What is connecting the two nerves?

Also regarding blood vessels, wouldn't there be a risk of clots forming (slowly recalling the nightmare that is clotting factors...). I feel like stitches would cause bumps in the vessels, which in turn would promote some coagulation on site too. What is used to reconnect these vessels if not stitching?

Wouldn't clotting/coagulation already be occurring in the severed limb? Fibrin already beginning to form? Would reattaching said limb cause any additional risk to the rest of the cardiovascular system by introducing potentially-coaggulated blood into the system?

I apologize if I use any terms incorrectly, and absolutely wouldn't be mind if someone pointed out that somethings I said was false!

submitted by /u/magnitorepulse
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Why heavier gases in the air don't sink to the bottom? Or if they do, how radically different is the air composition in terms of nitrogen, oxygen and carbon dioxide as we go up from sea level to mount Everest

Posted: 02 Mar 2021 03:27 AM PST

Why does the relativity energy, mass, and momentum relationship form a right triangle?

Posted: 01 Mar 2021 09:56 PM PST

So in relativity there is an equation that links momentum, mass (rest mass), and energy together. It is:

E2 = (PC)2 + (m*C2)2 (with E = energy, P = momentum, m = rest mass, and C = the speed of light)

One thing that stands out immediately is that it is the form of the pythagorean theorem. Namely, that Energy is the hypotenuse and the sides are PC (momentum times the speed of light) and mC2 (the classic old E=mC2 energy.) I know many physicists have a "shut-up and calculate" type of approach to these type of questions, but what does this relationship actually mean? Is there a commonly accepted interpretation of this? What does this imply about the world? To me this seems like a deep and interesting relationship, but I can't find anyone or anything really talking about it online aside from calling it "Einstein's triangle" or just pointing the relationship out.. The wiki shows a picture which illustrates the relationship and calls it "Einstein's Triangle", but not really anything explaining what it actually means.

If I squint my eyes and handwave a bunch, to me it seems like PC is the spatial energy component and mC2 is the time energy component and since they are orthogonal they form a right triangle. But why is the total relativistic energy the hypotenuse? I know one way of "seeing" relativity is that you and everything is always "moving" around at the speed of light, we just "move" more of our time energy and "velocity" to spatial dimensions. In which case, I could see a type of constant hypotenuse like relationship similar to if you are always walking around one step at a time, but just in different directions. The X and Y movements would change, but the hypotenuse is always one step. However, I still don't see why that would imply energy as the hypotenuse? Why can we look at this in a euclidean like way?

IDK, I may be rambling and not saying anything close to right here, but I am very curious about this. It is bugging me and I am hoping someone can clarify this or at least point me to something I can read. I may be missing something totally obvious, so go ahead and tell me why I am dumb, it would be much appreciated.

submitted by /u/Ringnebula13
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How does Fredkin gates bring computational energy cost to a zero?

Posted: 01 Mar 2021 11:24 AM PST

Also, Here in this video, what does Phil means when he says that it requires energy to raise information? Around 6 minute mark.

https://youtu.be/jv2H9fp9dT8?t=35

submitted by /u/saffrown
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How much gravity would be required for a light beam shown tangentially on a spherical surface to completely circle around the sphere and end up at the starting point instead of flying outwards?

Posted: 01 Mar 2021 08:15 AM PST

When you cut off a lobe of your liver it grows back. But why can't you cut off another lobe over and over again after it has regrown?

Posted: 01 Mar 2021 08:16 AM PST

What is AstraZeneca's proper efficacy rate?

Posted: 01 Mar 2021 02:16 PM PST

So I have seen some people say that the efficacy is higher than 62% but I can't find any sources so if anyone has a source please comment thank you

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Why are most objects in the solar system around the same inclination?

Posted: 01 Mar 2021 07:54 AM PST

I understand this most likely doesn't apply to every object, but the planets are a good example. The highest inclination of any planet (including Pluto) is Pluto itself at only 17°. Why is that the case? Why don't we have planets that are at all inclinations, even up to 90°?

submitted by /u/TheTeek03
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Monday, March 1, 2021

Why is it that when a person gets kidney stones, he/she has a risk of getting stones again?

Why is it that when a person gets kidney stones, he/she has a risk of getting stones again?


Why is it that when a person gets kidney stones, he/she has a risk of getting stones again?

Posted: 28 Feb 2021 08:42 PM PST

From what I understand, those who got kidney stones have a high chance of getting it again. Is there a difference in the risk of getting stones before that person got the stone?

submitted by /u/FirmNaringenin7312
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What type of porcelain glaze reduces surface tension?

Posted: 28 Feb 2021 09:22 AM PST

What type of porcelain reduces surface tension of water?

The best surface to mix watercolors is a porcelain glaze. When mixing watercolor, you want a palette surface where the water will spread out and stay where it's wiped from the brush, not bead up. Essentially, if you wipe a wet brush on the mixing surface, the water should streak out as a solid ribbon of water and not bead up and break.

When testing porcelain tile at home depot, I found that all of the bath tile caused the water to bead up to some degree. But, when I use a basic dinner plate, the water spreads out evenly without beading.

I am wondering why a glazed surface like a dinner plate would work fine, but a bath tile would not?

submitted by /u/healing_goose
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Are there any animals that migrate south for the summer and north for the winter?

Posted: 28 Feb 2021 08:17 PM PST

I mean northern hemisphere animals - do any seek out extremes of temperature like this?

submitted by /u/samzeman
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Does nuclear fusion happen in the corona?

Posted: 01 Mar 2021 02:34 AM PST

In college I learned that in order for nuclear fusion to start happening you need the energy of your electrons to be high enough to overcome the Coulomb potential, so that they can interact with the nucleus of atoms. The equation (3/2)nkT = e2 /r gives a temperature of ~1010 K, but taking into account quantum tunneling and using the de Broglie wavelength as the radius of the nucleus, you can get a much lower temperature of ~107 K.

That's pretty close to the temperatures observed in the corona. Wikipedia even mentions that the corona is 106 K and parts of it can reach even of 107 K, though doesn't have a source attached to it.

So does that mean that there are parts of the corona the can fuse hydrogen? I'm assuming the answer is no, and that you need a relatively high pressure as well for fusion to happen, but pressure doesn't seem to appear in the equations. Are the calculations above just approximations to get the order of magnitude for the temperature?

submitted by /u/Zestyclose_Steak_533
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How long does it take for fossil fuels to regenerate?

Posted: 01 Mar 2021 02:52 AM PST

Can monoclonal antibodies be used to target T memory cells?

Posted: 28 Feb 2021 06:42 PM PST

For example to wipe the immune memory of a vaccine/prior infection, or more usefully, to treat an autoimmune disorder like narcolepsy where it appears a long-term immune memory of the surface markers of some of your own cells (i.e. orexin-producing neurones) is created.

submitted by /u/learner123806
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How accurate can we get when measuring the speed of light? Wouldn't time be slower in one zone than another zone as the light travels, therefore make the measurements of it inconsistent?

Posted: 01 Mar 2021 01:19 AM PST

A metre is defined by the light, so the speed of light has no decimal points. So I was wondering if measurement of time is also define by the light as well. If not, would that not make it inconsistent, therefore cannot definitively measure it?

submitted by /u/jinnyjuice
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I understand that astronauts inside the ISS are free falling. What about the Apollo Astronauts?

Posted: 28 Feb 2021 08:26 PM PST

And How far do you have to go to have a bigger tug from the sun than the earth? Thanks.

submitted by /u/oodelay
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Why does beverage carbonation create a prickly sensation on the tongue?

Posted: 28 Feb 2021 07:23 PM PST

How much do different subregions of the brain differ in gene expression?

Posted: 28 Feb 2021 07:30 PM PST

In the book "What is thought?" by Eric Baum (2004), he predicts that there should be significant differences in gene expression between different regions of the brain, even between small subregions near each other. What have experiments with DNA microarrays (or other technologies) found to answer this question - how similar is gene expression across the brain regions of humans (or other mammals)?

submitted by /u/zappable
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How do we measure the specific gasses in an enclosed space?

Posted: 28 Feb 2021 03:50 PM PST

How does NASA measure what percentage of the atmosphere on the ISS is Oxygen, nitrogen, argon, CO2, etc...? I've been searching for a while and I'm unable to find how it's measured. For context, I'm going to be setting up an experiment dealing with how the atmospheric composition of a vacuum-sealed room fluctuates from both the amount of CO2 humans expel and the amount of O2 plants produce depends on how much CO2 is in the air. Thanks in advance for answering my question, and if you need me to clarify at all please let me know.

submitted by /u/AlienCrafter
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When a spacecraft gets a hole in it why does the air get sucked out so fast?

Posted: 28 Feb 2021 09:38 PM PST

Why does it happen so fast rather than just a slow leak? Can we calculate how fast oxygen gets sucked into a vacuum? Would different gases/elements (other than oxygen) react at different speeds?

submitted by /u/DiscoGalaxy
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How does radiation affect the nucleus of an atom?

Posted: 28 Feb 2021 02:10 PM PST

In chemistry/physics, you always hear about radiation exciting electrons to higher energy levels whenever they absorb a photon.

How does this work when looking at the protons in the nucleus of an atom? I've never heard about protons absorbing photons, or having discrete energy levels. But because they are a charged particle, surely they are affected by electromagnetic radiation, right?

Any insight would be appreciated :)

submitted by /u/ManlyMcBuff
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Do migraines increase vascular risk?

Posted: 28 Feb 2021 05:22 PM PST

Do chronic migraines & the regular use of migraine rescue medications (triptans, etc) increase the risk of cerebral vascular disease?

submitted by /u/Cookies-10
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Is the data in the USDA’s PLANTS database considered current, especially for native range? If not, what is the go-to source for plant information in the same context?

Posted: 28 Feb 2021 06:12 PM PST

How do multivalent vaccines work? Would it be feasible to make one with mRNA vaccines?

Posted: 28 Feb 2021 12:23 PM PST

I know that when you get a flu vaccine, it has multiple types of flu. But that's an inactivated virus vaccine, so as far as I know they basically just put multiple types of flu virus in a vial together. Would it be possible to do the same with different spike protein mRNA pieces for multiple different covid variants?

submitted by /u/TheApiary
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Is the Earth's orbit level?

Posted: 28 Feb 2021 12:35 PM PST

By which I mean - 365.25 days ago from this moment, were we in the exact same 'spot' in space as we are now? (With respect to the sun, I mean - pretending that the galaxy isn't also moving, etc etc.) Or does the plane of our revolution 'wobble'?

submitted by /u/coffee_for_lunch
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Is nose blindness a matter of the filtering of conscious perception or receptor fatigue?

Posted: 28 Feb 2021 01:10 PM PST

Put simply, if you put a bit of perfume on somebody several hours before they woke, would they notice the scent upon waking or would having been exposed to it for those hours of sleep have desensitized them to it?

submitted by /u/hooligan333
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Does the Milky Way move in line with the plane of it's spin? Perpendicular? Or does it tumble?

Posted: 28 Feb 2021 02:54 PM PST

Can ionising radiation kill you instantly?

Posted: 28 Feb 2021 10:00 AM PST

Can ionising radiation kill you instantly? What's the example scenario of instant death due to ionising radiation? How high is the radiation dose to die instantly (or in a seconds)?

submitted by /u/TheRealTiwik
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What causes cities to have hard water vs. soft water?

Posted: 28 Feb 2021 01:23 PM PST

Is hard water something that's mainly a result from the actual water source or a result from bad infrastructure by the utility? I understand that a lot of people say the only downside is the taste but I live in a city with very hard water and see it wreaking havoc on my house from the buildup of calcium. I would think its doing similar things to the pipes throughout the city and they would be incentivized to soften the water at the plant. What's the biggest determinant for a city's given water softness?

submitted by /u/marginallymoderate
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Is there a reverse to the placebo effect?

Posted: 28 Feb 2021 08:42 AM PST

I know about the placebo effect, where an inert substitute can cause some beneficial outcome, and the nocebo effect, where an inert substitute can cause negative side effects, but is there a reverse to the placebo effect? Where an active drug that the person taking it believes is inert ends up being less effective as a result?

If this occurs, what is it called? Is it simply a form of nocebo?

submitted by /u/Timothyre99
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