What percentage of a human fart is produced by bacteria, and what percentage is actually produced by *you* ?

---

• What percentage of a human fart is produced by bacteria, and what percentage is actually produced by *you* ?
• How did humans figure out that the ocean tides had anything to do with the moon?
• What is the meaning and scope of yesterday's (20/01) notice by the WHO about the reliability of PCR COVID-19 tests?
• Is it rare that planet earth has such a wide variety of elements in its crust and atmosphere?
• How do supercomputers work with many CPU's and GPU's?
• Are there any cases of animals caring for disabled offspring?
• What is the science behind blacklights (color, visible spectrum, chemical makeup, etc.)?
• Prevent sea level rise by removing boats?
• Are there non-von Neumann computers? If not, why did the architecture need a name? It's not as though there's a dearth of things named after von Neumann.
• What would happen if we installed artificial poles on the moon to protect astronauts from solar flares?
• Fur is believed to have evolved at least 200 million years ago, before the divergence of monotremes, marsupials, and placental mammals. Why are depictions of mammalian ancestors so often shown without fur?
• How does the immune system not clear cells carrying the mRNA vaccine?
• How can both [Cu(H2O)4]2+ and [Cu(H2O)6]2+ exist?
• What are the statistics for the means through which HIV is spread?
• Purpose of tracrRNA in CRISPR?
• How much UV or IR sunlight reflect a white wall or tile with the window open? And with the window closed? Enough to decolorate / damage books, PVC / ABS and video games in few years?
• Besides Uranium-Lead decay, is there another method for measuring the age of the Earth?
• If storage and loss modulus relate to thickness and thinness, why does modulus crossover show storage modulus increasing and vice versa when a material is being shear-thinned?
• Do two objects of different masses exert the same amount of forcer on EACH OTHER?
• Is there any way to research, or research that exists, to see if coral reefs have bleached in the distant past during global climate warmings?

What percentage of a human fart is produced by bacteria, and what percentage is actually produced by *you* ? Posted: 20 Jan 2021 10:40 PM PST A lot of the gas in farts is produced by bacteria, but how much? When I fart, am I mostly just farting out some other organism's farts? Or is the majority of the gas in my farts gas that I made myself? submitted by /u/flabby_kat [link] [comments]

How did humans figure out that the ocean tides had anything to do with the moon? Posted: 20 Jan 2021 09:31 PM PST Early humans certainly realized that tides occurs with predictable regularity. And they knew that the moon had a predictable, regular cycle. But it's not nearly as obvious to the naked eye that there is a causal relationship between the tides and the celestial body hanging out in the sky. When did we figure out that the moon causes the tides, and what proved it? submitted by /u/nekochanwich [link] [comments]

What is the meaning and scope of yesterday's (20/01) notice by the WHO about the reliability of PCR COVID-19 tests? Posted: 21 Jan 2021 05:49 AM PST https://www.who.int/news/item/20-01-2021-who-information-notice-for-ivd-users-2020-05 [this] means that the probability that a person who has a positive result is truly infected with SARS-CoV-2 decreases as prevalence decreases submitted by /u/gooblefrump [link] [comments]

Is it rare that planet earth has such a wide variety of elements in its crust and atmosphere? Posted: 21 Jan 2021 03:02 AM PST This might seem like an odd question, or even a stupid one, but after searching online for a more concrete answer I couldn't find anything. So I hope you don't mind me turning to here. I'll start by explaining my question slightly better. We know that 74% ish of all mater in the universe is Hydrogen or Helium, and that the higher the atomic number the less there tends to be in the universe, (generally speaking). So compared to Hydrogen and Helium, you would expect to find a lot less iron, copper, gold, etc if you took a random area of space. My question is if these elements are only created by the collapse of stars, and that they are quite infrequent, how is it that we have at least 90 different elements found naturally in and around the earth? An offshoot of this question is, are we lucky to be seemingly rich in a diverse amount of elements? Would it have been possible that our earth was comprised mostly of copper, with tiny amounts of other useful elements? If so, then why were we so lucky? Is it a result of us being here, that to do so we needed these conditions, even if relatively speaking these conditions are very unlikely - like the Goldilocks zone of element variety. Or is my prior statement not the case, do we actually have a disproportionate amount of some elements, but an individual can't really gauge that? Any insight would be much appreciated! It's been bugging me, and google showed no answers submitted by /u/Rosslefrancais [link] [comments]

How do supercomputers work with many CPU's and GPU's? Posted: 21 Jan 2021 05:20 AM PST Normal computers have problems making SLI run and I think its actually becoming less of a thing lately, yet supercomputers have truck loads of GPU's and CPU's all working together to render some massive weather data or something else? Why cant I have multiple GPU's and CPU's in a normal PC? Specially the CPU's, since I know SLI for GPU's is at least somewhat a thing. submitted by /u/KaktitsM [link] [comments]

Are there any cases of animals caring for disabled offspring? Posted: 20 Jan 2021 08:56 PM PST submitted by /u/hojak [link] [comments]

What is the science behind blacklights (color, visible spectrum, chemical makeup, etc.)? Posted: 20 Jan 2021 09:12 PM PST Okay so the title may be a bit deceiving for what I'm asking... I've done my Googling, but there's just some things I would really like to learn about blacklights. Why can't I photograph a blacklight CFL bulb the way it appears to my eyes? When I power one, I see sort of like a deep plum, but also a blue/white? I'm not sure how to explain it. When I try to photograph it, it comes out pink and kind of teal. I was thinking maybe it was because cameras and see a greater spectrum than our eyes, but I'm not sure. What exactly is so "special" about the phosphor coating in a blacklight flourescent tube or CFL that makes it different than a regular flourescent light? My bulb has a dark glass, and it looks like a purple film inside... I'm assuming it's a blacklight blue bulb, for reference. I find this stuff so interesting, I just need answers!!! I'm into photography and 3D rendering in tools like blender and recreating what I'm seeing with my eyes is so difficult. I feel like if I had a better understanding how blacklights and the spectrum of light worked, then it would all come together. :) Thanks guys! submitted by /u/I-dont-get-it-21 [link] [comments]

Prevent sea level rise by removing boats? Posted: 21 Jan 2021 03:14 AM PST Could we potentially prevent (or for a better word postpone) sea level rise for places like Kiribati, etc. if we removed all boats, ships and other man-made floating devices from the ocean? Would this have a large impact? submitted by /u/saschavino [link] [comments]

Are there non-von Neumann computers? If not, why did the architecture need a name? It's not as though there's a dearth of things named after von Neumann. Posted: 20 Jan 2021 05:22 PM PST List of things named after John von Neumann submitted by /u/vaguelystem [link] [comments]

What would happen if we installed artificial poles on the moon to protect astronauts from solar flares? Posted: 20 Jan 2021 01:22 PM PST Would creating an artificial electro-magnetic field around the moon cause any adverse effects? Would it be useful for protecting astronauts from solar flares or would lunar regolith radiation shields be more effective and economical. submitted by /u/Farrt1 [link] [comments]

Fur is believed to have evolved at least 200 million years ago, before the divergence of monotremes, marsupials, and placental mammals. Why are depictions of mammalian ancestors so often shown without fur? Posted: 20 Jan 2021 08:24 PM PST (especially stem mammals from the early triassic and even late permian) submitted by /u/catras_new_haircut [link] [comments]

How does the immune system not clear cells carrying the mRNA vaccine? Posted: 20 Jan 2021 02:31 PM PST Hello /r/askscience! My colleagues and I (all bio-lab people) are a bit stumped on this bit. We understand that the Covid vaccine carries mRNA in a lipid membrane, that is then carried into cells and translated into protein. Then this protein is presented to the immune system (How though? On the cellular membrane, or through MHC?) We also understand that the immune system recognizes this as foreign and thus will develop antibodies. What we don't quite get is why the immune system (Through for instance CD8 Tcells) doesn't start wiping out all the "infected" human cells. To my knowledge, none of the vaccines noted any cell death as a result of jab. I had some suggestions, but I don't really got a solid answer for this either. - Is the mRNA degraded by the time the CD8 cells are active, so that the "infected" cells are cured again? - Are there perhaps cytokines or other markers absent in an "infection" caused by a RNA vaccine that prevent T-cell killing? - Is it something else entirely? Hope to hear your thoughts! submitted by /u/Thedutchjelle [link] [comments]

How can both [Cu(H2O)4]2+ and [Cu(H2O)6]2+ exist? Posted: 20 Jan 2021 08:32 PM PST When I search for Complex Cu-ions I keep finding [Cu(H2O)6]2+, however I know that [Cu(H2O)4]2+ is also possible. What determines if it's [Cu(H2O)4]2+ or [Cu(H2O)6]2+? ​ And in the case of [Cu(H2O)6]2+, how does that work cause I can't figure out the hybridization that's going on here? submitted by /u/mitoma33333 [link] [comments]

What are the statistics for the means through which HIV is spread? Posted: 21 Jan 2021 01:53 AM PST For example, what percentage of infections are due to mother-child, anal sex, vaginal sex etc? submitted by /u/eno4evva [link] [comments]

Purpose of tracrRNA in CRISPR? Posted: 20 Jan 2021 04:15 PM PST What is the role of tracrRNA in Type II CRISPR? It's to my understanding that it binds to the repeated sequence mRNA, but what exactly does it do? One more thing, how does the CRISPR system deal with RNA viruses? What sort of process would make that piece of RNA from the virus that the bacteria wants to incorporate into its CRISPR locus into DNA? Thanks in advance. submitted by /u/biogenesisforest [link] [comments]

How much UV or IR sunlight reflect a white wall or tile with the window open? And with the window closed? Enough to decolorate / damage books, PVC / ABS and video games in few years? Posted: 20 Jan 2021 04:40 PM PST submitted by /u/AngelKH15 [link] [comments]

Besides Uranium-Lead decay, is there another method for measuring the age of the Earth? Posted: 20 Jan 2021 04:42 PM PST Uranium-Lead decay has been used for a long time and gives Earth an estimated age of 4.5 to 4.6 billion years. But is there another method that can be used to confirm or even refine this estimate? submitted by /u/Morzo_Voidmaster [link] [comments]

If storage and loss modulus relate to thickness and thinness, why does modulus crossover show storage modulus increasing and vice versa when a material is being shear-thinned? Posted: 20 Jan 2021 11:31 AM PST The title pretty much covers it. When a material in melt phase is being shear thinned with oscillatory motion in a rotational rheometer, you see some materials shear thin as the angular frequency increases. However, when you see modulus crossover happen on the same material, it's actually the storage modulus rising above the loss modulus, which to me seems like that would mean it's getting thicker. submitted by /u/UndercoverProphet [link] [comments]

Do two objects of different masses exert the same amount of forcer on EACH OTHER? Posted: 20 Jan 2021 01:16 PM PST Lets say object A is 10 is units of Mass, while object B is 20 units of Mass. Will both objects exert the same amount (strength) of gravitational force on each other? Assume they are 5 units of distance away from each other. I'm having a hard time wrapping my head around this concept. I know the force of gravity between the two objects changes as they get larger/smaller/closer/further, but is the amount of force they exert on each other the same? submitted by /u/codly68 [link] [comments]

Is there any way to research, or research that exists, to see if coral reefs have bleached in the distant past during global climate warmings? Posted: 20 Jan 2021 04:44 PM PST From my reading, corals bleach due to ocean acidification which is primarily due to excess CO2, this leads to poor reef health if not complete death. Given the fragility of reef structures, I assume that bleached reefs would eventually fall and form into sand which is most likely incredibly hard to date and historically analyze like ice in the polar caps. Is there a way to specifically look at the acidification of coral over millennia, or maybe the evidence of acidification leading to bleaching? I ask due to an argument about the validity of human-caused global warming models, especially around natural global warming cycles and human contribution to existing (natural) CO2 levels in the atmosphere. So I'm wondering what kind of information we can draw about acidification. submitted by /u/boydo579 [link] [comments]

You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now.	Email delivery powered by Google
Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States