- Numerically there have been more deaths from the common flu than from the new Corona virus, but that is because it is still contained at the moment. Just how deadly is it compared to the established influenza strains? And SARS? And the swine flu?
- When we eat meat, it has cells which have the animal's DNA and RNA. What does out body do to them once they've been digested and broken down into nucleotides? Do our cells use these nucleotides when replicating DNA or making mRNA?
- How do we know a single quark's mass if quarks don't exist as individual particles?
- Where did MERS, SARS, Swine Flu etc go?
- How do fish naturally "spread" to other lakes/ponds?
- When does a baby's life begin?
- How does viral count of influenza evolve after washing hands?
- Van der Waal's equation of State, Why is Pressure proportional to density squared?
- Does anyone have an intuitive explanation of why optical bandgaps appear in periodic materials?
- Does cholesterol primarily block arteries in the heart, or do blockages occur everywhere, but are only of consequence in the heart?
- What does light years have to do with space travel?
- Do identical twins occur exist for animals, or just humans?
| Posted: 28 Feb 2020 04:02 PM PST Can we estimate the fatality rate of COVID-19 well enough for comparisons, yet? (The initial rate was 2.3%, but it has evidently dropped some with better care.) And if so, how does it compare? Would it make flu season significantly more deadly if it isn't contained? Or is that even the best metric? Maybe the number of new people each person infects is just as important a factor? [link] [comments]  |
| Posted: 28 Feb 2020 10:03 PM PST |
| How do we know a single quark's mass if quarks don't exist as individual particles? Posted: 28 Feb 2020 02:28 PM PST A proton's mass is 900-something MeV A pion's mass is about 140. And "Single" up and down quarks have masses of 2 and 4 MeV. Wikipedia says that the rest of the energy comes from gluon interaction, at least in case of baryons. I can't seem to find the info whether mesons are too bound by gluons, but I assume it is so. How did we figure how much mass is attributed to the quark itself and how much - to their binding energy? Did we just calculate the binding energy somehow and then substracted it from the total mass, or is it something more complicated? Again, if a quark can't exist as a single particle, then what exactly is its "mass"? Apologies if I'm misunderstanding anything. [link] [comments]  |
| Where did MERS, SARS, Swine Flu etc go? Posted: 29 Feb 2020 04:02 AM PST Previous viral scares never spread to the general population. Containment efforts can't be the explanation, those would only slow the spread. With modern transportation, eventually nearly every person in the world should be exposed to these viruses, with a billion people dead given a 1 to 2% death rate . Instead the death counts have been in the thousands. Off by five to six orders of magnitude. What gives? [link] [comments]  |
| How do fish naturally "spread" to other lakes/ponds? Posted: 28 Feb 2020 08:49 PM PST For a little background to my question. My uncle bought a house with a decent piece of property. He dug a large pond that he has been intending to stock with fish for his grandkids, nieces and nephews. He dug this pond a couple of years ago, and has been letting the natural plants grow around it, balancing the PH, and just getting it suited for fish. A few days ago, he noticed several small pan fish around the edge of the pond. He didn't put them in, and his pond is pretty far from any roads or streets, and near his house, so it's very unlikely anyone dumped anything in. There is no water running in, and no floods connecting it to any other water. People on his Facebook have suggested birds of prey dropping them in, or even bears/cougars. Those seem relatively unlikely as I would think they would be unable to survive swim after being grabbed/dropped by a large predator. I'm unconvinced, any ideas? [link] [comments]  |
| When does a baby's life begin? Posted: 29 Feb 2020 04:25 AM PST I got into an argument with a friend of mine, he said that a baby (at this point a fetus) is alive from the moment of conception. I myself, strongly disagreed. After spending a good amount of time actually researching this topic and not relying on hearsay anymore, i came to the conclusion that the sources i found are not clear or lack the desires information. When does life begin for a baby? At which point of the development of a fetus can we say that it is alive? Or does it come alive earlier? [link] [comments]  |
| How does viral count of influenza evolve after washing hands? Posted: 29 Feb 2020 04:06 AM PST This question is based on health guidelines about washing hands due to COVID-19. If you wash your hands in a public restroom, after closing the tap and opening the door, your hands are likely get dirty again. I'd like to know how to quantify this. I think the virus with most of information available which spreads easily would be influenza (either the 2009 H1N1 or some other strain). As a first approximation, maybe some here knows what percentage of viruses are left or picked up after briefly touching a surface? What experiments have been done? Also seems to be very relevant the percentage of the population that is infected. If you touched the only person infected in the world, after washing it the risk going to be greatly reduced. But if most of the population is infected, washing might not make much difference. [link] [comments]  |
| Van der Waal's equation of State, Why is Pressure proportional to density squared? Posted: 29 Feb 2020 01:40 AM PST The text in the book ( Heat Thermodynamics and Statistical Physics by Brijlal ) on the equation of state for a gas, correction for pressure, starts with stating 2 factors:
But then, it says, according to these 2 factors, pressure is directly proportional to density squared. please explain how so. [link] [comments]  |
| Does anyone have an intuitive explanation of why optical bandgaps appear in periodic materials? Posted: 28 Feb 2020 09:44 PM PST I've been looking at explanations in lecture notes and text books, but they rely quite a lot of mathematics of reciprocal vectors and momentum that I haven't got my head around yet. Does anyone have an intuitive explanation of why this should happen? [link] [comments]  |
| Posted: 28 Feb 2020 08:02 AM PST |
| What does light years have to do with space travel? Posted: 28 Feb 2020 11:57 AM PST My understanding of a light year is how fast light travels, but why do scientists use light years to measure the distance between planets and how fast does light move in a year? Would the number in regular years be misunderstanding to a lot of people? I really don't understand the concept of it... Sorry the title is supposed to say do. [link] [comments]  |
| Do identical twins occur exist for animals, or just humans? Posted: 28 Feb 2020 07:15 AM PST |
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