If cases were lower with Coronavirus, would that mean less variants? |
- If cases were lower with Coronavirus, would that mean less variants?
- 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!
- Does exposure to covid increase immunity for already vaccinated people?
- What is the R value for asymptomatic Covid compared with symptomatic?
- Are all planets spherical?
- Why is there no such thing as x-ray or gamma ray goggles like their are night vision goggles (infra-red)?
- 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?
- 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
- Why does the relativity energy, mass, and momentum relationship form a right triangle?
- How does Fredkin gates bring computational energy cost to a zero?
- 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?
- 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?
- What is AstraZeneca's proper efficacy rate?
- Why are most objects in the solar system around the same inclination?
| If cases were lower with Coronavirus, would that mean less variants? Posted: 01 Mar 2021 05:06 PM PST |
| 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 [link] [comments]  |
| 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? [link] [comments]  |
| 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. [link] [comments]  |
| 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? [link] [comments]  |
| Posted: 02 Mar 2021 05:01 AM PST |
| 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! [link] [comments]  |
| 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. [link] [comments]  |
| 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. [link] [comments]  |
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| 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 [link] [comments]  |
| 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°? [link] [comments]  |
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