Why have so few people died of COVID-19 in Germany (so far)? |
- Why have so few people died of COVID-19 in Germany (so far)?
- Why is the CMB radiation not only always around us, but ALWAYS with us?
- Do satellites maintain the same velocity forever?
- “High energy particles” ejected from a black hole?
- Ask Anything Wednesday - Engineering, Mathematics, Computer Science
- Why did human knees evolve backwards from from other animals, for example a dogs knees?
- Does continental crust have a "recycling" process that oceanic crust does?
- Do stars "turn on" immediately when fusion can occur, or do they gradually increase in brightness as they gain mass?
- Do germs and viruses move around on surfaces?
- In every article I seem to find, people are saying that magnetic force follows an inverse square law with respect to distance from objects. However when I use paper as a medium to separate, this does not seem to be the case. What's going on here?
- If pee contains water, why does the body excrete it rather than reuse it?
- If immunocompetent lymphocytes are released from the bone marrow and thymus, then can they just then bind to a random antigen or do they get released with receptors for one specific antigen only?
- How do the seasonal viruses survive to the next season? Do they go inactive or spread to different parts of the world?
- How do we know who launched chemical attacks on Douma just be looking at the weapons?
- How do we know Dinosaurs slept?
- Medicine: What white blood cell count would be low enough to make you immunocomprised/immunosuppressed?
- How does titantium dioxide work because don't mono, di, tri etc. prefixes only are used for covalent bonding?
| Why have so few people died of COVID-19 in Germany (so far)? Posted: 11 Mar 2020 02:32 AM PDT At the time of writing the mortality rate in Germany is 0.15% (2 out of 1296 confirmed cases) with the rate in Italy about 6% (with a similar age structure) and the worldwide rate around 2% - 3%. Is this because
tl;dr: Is Germany early, lucky or better? Edit: I was off in the mortality rate for Italy by an order of magnitude, because obviously I can't math. [link] [comments]  |
| Why is the CMB radiation not only always around us, but ALWAYS with us? Posted: 11 Mar 2020 03:51 AM PDT As far as I understand, the CMB is the result of the recombination, that is when the photons could finally travel freely. If all the photons "escaped" at more or less the same time, why are we constantly "seeing" these photons? Shouldn't they go past us and then be gone to further places in the Universe? Light from the stars is different because stars are constantly producing this light and that's why we can observe it in a constant fashion. However, the moment of recombination is not constantly emitting light because it is that, a moment. So I am very confused. [link] [comments]  |
| Do satellites maintain the same velocity forever? Posted: 11 Mar 2020 06:18 AM PDT Today in my physics class we talked about the gravitational field and about the elliptical orbit of satellites. My question now is if the satellite would continue to be accelerated and slowed down by the gravitational field of the earth forever? And if so wouldn't that mean that no energy is converted (for example in heat)? [link] [comments]  |
| “High energy particles” ejected from a black hole? Posted: 11 Mar 2020 05:50 AM PDT I'm a non-physicist and poor math student trying to slog through Dr Hawking's "A Brief History of Time." He says something in the chapter on black holes that has me confused. He states:
I'm not sure how this works - it was my understanding that the gravity of a black hole is so strong that nothing escapes it, including light. If that's the case, how are these "high-energy particles" ejected from the black hole? How do they escape or avoid the attraction of gravity from the BH? [link] [comments]  |
| Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 11 Mar 2020 08:08 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer 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! [link] [comments]  |
| Why did human knees evolve backwards from from other animals, for example a dogs knees? Posted: 10 Mar 2020 10:00 AM PDT |
| Does continental crust have a "recycling" process that oceanic crust does? Posted: 10 Mar 2020 11:24 PM PDT Oceanic crust gets subducted and melted in subduction zones and new gets created in mid- ocean ridges but does continental crust have something similar? And how does mountain erosion fit into this? [link] [comments]  |
| Posted: 10 Mar 2020 01:03 PM PDT Basically, does the first fusion event "kick-start" the star into life in a violent, sudden reaction? Or does the star slowly grow in luminosity at the rate at which it is able to add mass to itself? [link] [comments]  |
| Do germs and viruses move around on surfaces? Posted: 10 Mar 2020 10:30 AM PDT With the recent outbreaks, everyone's talking about how viruses and germs can be transferred via touch, but can they also move around? For instance, if my hand is contaminated and I'm using a spoon to eat, can germs/viruses move down the spoon from the handle? [link] [comments]  |
| Posted: 10 Mar 2020 02:55 PM PDT So my setup is a metal baseplate, sheets of paper on top of the baseplate, a magnet, and a bar with a hook on it to connect both a magnet and a newtonmeter. I vary the amount of sheets of paper that seperates the magnet from the baseplate and I record the amount of force needed to pull the magnet off. All of the sheets of paper I used were EXACTLY 0.10 mm, and with the same neodymium magnet each time, (3mm radius, 117mT), I measured the force needed to pull off the magnet for 0, 5, 10, 15, 20, 25, 30, 40, 50, and 60 sheets of paper. What I found was that the expected result that the force needed to pull it off would be proportional to the inverse square, did NOT hold. R^2 for my data was only 0.569, whereas for taking logarithms of the force, the R^2 value was 0.995 instead. This just doesn't really seem to make sense to me with the way that I understand magnetic forces, but this relation is much more akin to finding the half-value thickness of a material for the purposes of attenuating radiation. Similar results were found for when I changed the medium to polymethylacrylate as well, where the log relationship was much stronger. Does anyone have an explanation for this? Have I missed something very trivial? EDIT: downvoted? Wut [link] [comments]  |
| If pee contains water, why does the body excrete it rather than reuse it? Posted: 10 Mar 2020 07:17 PM PDT I just saw a post about the ISS reusing water from urine to be drunk again, which made me wonder why the body doesn't automatically do this. [link] [comments]  |
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| How do we know who launched chemical attacks on Douma just be looking at the weapons? Posted: 10 Mar 2020 01:13 PM PDT |
| How do we know Dinosaurs slept? Posted: 10 Mar 2020 08:32 AM PDT I am looking it up and I find lots of articles talking about if they lie down or stand up to sleep. But, how do we know if they slept at all? What if they rested in a different way than currently living creatures? Dolphins sleep in a very unique way compared to humans and what if Dinosaurs also had unique sleep patterns or sleep habits that are not comparable to today's creatures? [link] [comments]  |
| Posted: 10 Mar 2020 08:07 AM PDT Medicine: What white blood cell count would be low enough to make you immunocomprised/immunosuppressed?l [link] [comments]  |
| Posted: 10 Mar 2020 07:19 AM PDT |
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