How did early humans figure out the planets were actually planets, and not stars, before the the invention of the telescope? |
- How did early humans figure out the planets were actually planets, and not stars, before the the invention of the telescope?
- How did the “Avatar Mountains” (Zhangjiajie, China) form, and why isn’t there any mountains similar to them anywhere else in the world?
- In recent history, are any vaccines known to have caused any permanent damage to participants in trials?
- Do vaccines become obsolete after a while due to viruses mutating?
- How did scientists estimate the age of Earth before the advent of radiometric dating?
- How do surgeons connect small veins when reattaching limbs?
- Hypothetical earth crater question. How do you calculate the uplifted rim height if you only know the full depth or width?
- Does the human body store "materials" to build "on-demand" substances (like saliva, mucus, tears, blood, semen) in some "warehouse" and do these substances share common building blocks (e.g. water)?
- Which animal populations is COVID already shown to be in? Which animal populations is it suspected or likely to be in?
- Can you export electricity?
- Do solar flares affect the back facing side of earth? How?
- Why does the atomic structure of pure elements impact electrical conductivity?
- How does the Pfizer Covid-19 vaccine work in the context of antigen presentation?
- how will Antarctica melting raise the sea levels?
- Does learning in general increase one's intelligence quotient?
- How big is the difference in heat retention of ruby/sapphire vs quartz?
- Before there were fossil fuels, was there an amount of atmospheric carbon proportional to how much fossil fuels are there?
- Why does a CPU need so many transistors?
| Posted: 14 Nov 2020 05:56 PM PST I was wondering how humans figured out how Jupiter/Saturn/ etc were different than the hundreds of stars in the night sky. Thanks. [link] [comments]  |
| Posted: 14 Nov 2020 05:27 PM PST If my understanding of weathering and erosion is correct, there's nothing special about the area to cause the odd-looking mountains to form [link] [comments]  |
| Posted: 14 Nov 2020 10:01 PM PST Obviously there is lots of misinformation spreading, and using Google I almost only found "alt news". We know vaccines are safe because they are rigorously tested, but what about vaccine trials? With the covid-19 vaccine trials going on, I have wondered if anything ever went wrong in a vaccine trial? Was there any long-lasting damage or even death in participants that was associated with the vaccine in a Phase 3 trial? If yes, what happened and what was the underlying mechanism that caused the damage? Thanks :) [link] [comments]  |
| Do vaccines become obsolete after a while due to viruses mutating? Posted: 14 Nov 2020 11:17 PM PST It's something that I've been wondering with the ongoing pandemic and the COVID vaccine that was recently announced. [link] [comments]  |
| How did scientists estimate the age of Earth before the advent of radiometric dating? Posted: 14 Nov 2020 07:19 PM PST |
| How do surgeons connect small veins when reattaching limbs? Posted: 14 Nov 2020 06:27 AM PST How do surgeons know when they have stitched together enough blood supply when reattaching limbs? I imagine suturing arteries are "easier" because they are generally much larger than veins but I wonder at what point do the surgeons just decide some blood vessels are too small to reconnect and just leave it up to the body to heal. I have never taken an anatomy class so I'm not well informed on the human body. [link] [comments]  |
| Posted: 14 Nov 2020 05:35 PM PST |
| Posted: 14 Nov 2020 06:49 AM PST I've been doing some woodworking recently and I noticed my body doesn't seem to have a shortage of mucus. I'm pretty sure (though still guessing) the body doesn't have a tank of mucus waiting to get secreted, so I assume the body instead stores common building blocks somewhere and build the secretions on the fly. [link] [comments]  |
| Posted: 14 Nov 2020 04:58 PM PST |
| Posted: 14 Nov 2020 09:20 AM PST With countries starting to produce more green energy could they in theory sell that electricity to other countries or would it be more the technology to produce electricity? [link] [comments]  |
| Do solar flares affect the back facing side of earth? How? Posted: 14 Nov 2020 07:52 AM PST |
| Why does the atomic structure of pure elements impact electrical conductivity? Posted: 14 Nov 2020 06:35 AM PST In semiconductors, I'm aware of the concept of 'doping' silicon with different elements to make it more/less conductive and in different directions. But in PURE carbon for example, why does atomic structure have such a big impact on electrical resistivity? Diamond (Cubic Crystal): Terrible Conductor Nanofoam (Un-ordered Web): Poor Conductor Graphite (Un-Uniform Hexagonal Crystal): Okay Conductor Graphene (Uniform Hexagonal Crystal): Amazing Conductor Do electrons have varying levels of resistance that they need to overcome to be liberated from an atom based on direction? [link] [comments]  |
| How does the Pfizer Covid-19 vaccine work in the context of antigen presentation? Posted: 14 Nov 2020 09:08 AM PST Hi all, I'm curious about the mechanism of action for the Pfizer vaccine. I understand the basic principle - using an mRNA to express the viral protein rather than delivering the protein/virus directly. This is a two part question I guess. First, is this vaccine somehow preferentially delivered to antigen presenting cells? If it's not delivered to APCs, but rather a pan-cell type delivery how can the protein be seen as foreign? If all cells types express the protein, then wouldn't it be seen as "self"? [link] [comments]  |
| how will Antarctica melting raise the sea levels? Posted: 14 Nov 2020 12:54 PM PST I know this question has been asked dozens of times but none of the explanations have addressed this. Antarctica is about 2.57 km (1.6 miles) thick, and most of that is underwater. It goes up to 2.41 (1.5 miles) under the water at some parts and in general, is sitting on top of the landmass below it. That is based off of this source here. I know this says approximates but it's the only source I can find. 2.41km/2.57km = 93.77% of the ice is underwater. If our density of ice compared to the density of seawater comes out to be greater than that, that means that our ice is being pushed up by the continent and would sink further into the water if given the chance, but if it is lower, that means that the ice is stuck to the continent, and naturally wants to float upwards as it is displacing more water than its weight would allow. All according to Archimedes' principle (here). Ice's density is about 0.916 g/cm3 (here), compared to sea water's density is about 1.025 g/cm3 (here), so 0.916g/cm3 / 1.025g/cm3 = 0.893% of our ice should be underwater. Based on this, the melting of the icecaps should decrease the level of the sea (as it would go back to freshwater, 1g/cm3 / 1.025g/cm3 = 97.5% of the volume of what it was). Is there a factor I'm not seeing here or did I get something wrong? Edit: Forgot to mention, all the articles that I've seen online say it'll raise sea levels ~60-70 meters Like this one, but all the ones I've seen do the math as if all of it is sitting on top of the water, and none of it is submerged. Surely taking the submerged portions into account would greatly diminish that estimate, or have I missed something again? [link] [comments]  |
| Does learning in general increase one's intelligence quotient? Posted: 14 Nov 2020 07:37 AM PST |
| How big is the difference in heat retention of ruby/sapphire vs quartz? Posted: 14 Nov 2020 06:27 AM PST This is a dab related question, sales guy mentioned he heard ruby has 30x better heat retention that quartz; and I've been unable to verify that with Google. [link] [comments]  |
| Posted: 14 Nov 2020 07:05 AM PST The formation of fossil fuels consume atmospheric carbon. Does it mean way back then the earth atmosphere had a much higher concentration of CO2? [link] [comments]  |
| Why does a CPU need so many transistors? Posted: 14 Nov 2020 09:51 AM PST |
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