Is there research yet on likelihood of reinfection after recovering from the omicron variant? |
- Is there research yet on likelihood of reinfection after recovering from the omicron variant?
- How do liquid fuel rocket engines reignite in zero-g without destroying the turbopump? (fuel sloshing problem)
- With the Tonga Volcano happening; my son asked me how long it would take for another New Zealand-sized island to emerge in the south pacific. Would it be a matter of thousands of years or billions? Or could it happen tomorrow?
- Domesticated animals are known to be a source of many diseases in humans. Historically, are there any pandemics that have been caused by canine diseases? If not, why do dogs not carry plague-worthy illnesses, or why are humans immune?
- Can volcanos release radioactive elements?
- Does lightning occur on Mars? If so, what is the effect of such a high-temperature phenomenon in such a cold environment?
- What is the decision process to decide which medicines becomes tablets and which becomes capsules?
- Is it possible for the Tor network to have better connection speed without sacrificing security/privacy?
- Are rod cells also used in photopic vision?
- Is the Detonation Velocity the same speed at which an explosion travels at?
- Do species with shorter life spans evolve more quickly than ones with longer life spans?
- How can some people escape Epstein-Barr virus?
- Is it true that marine iguanas boil the algae they consume before digesting them?
- How rare is it for humans to have extra adult teeth?
- Can some ice be harder than other?
- Why does isopropyl alcohol evaporate faster than ethanol?
- Sonic booms from the Tonga explosion in the South Pacific were heard in Anchorage (~9200km away) but not in Seattle (~9100km away) or Los Angeles (~8400km away). Do we know why that is?
- If an embryo develops a mutation during development, is it possible that some cells will have the mutation and others won't?
- What is the maximum distance one can vertically "suck" water like a syringe?
- What determines the power of a tsunami wave?
- How did we contain Ebola but couldn't contain Covid?
| Is there research yet on likelihood of reinfection after recovering from the omicron variant? Posted: 17 Jan 2022 04:04 AM PST I was curious about either in vaccinated individuals or for young children (five or younger), but any cohort would be of interest. Some recommendations say "safe for 90 days" but it's unclear if this holds for this variant. [link] [comments] |
| Posted: 17 Jan 2022 02:43 AM PST Hi! This is for You rocket engineers out here! From my (very limited) understanding, a big problem with reignition of a liquid-fuel rocket engine in space is the 'sloshing' of liquid within the tanks. When the engines are already fired it causes no issue, since the g-forces during acceleration keep the fuel at the 'bottom' of the tank, where the pump is. But how is this risk, of the pumps running empty, mitigated during reignition? I can imagine you could give the rocket a "push" with reaction thrusters to force the fuel to the bottom of the tank and then start up the pumps, but I haven't managed to find any real literature addressing this problem. If You know something about this I would be interested to hear Your take on it! Thank You! [link] [comments] |
| Posted: 16 Jan 2022 04:32 AM PST |
| Posted: 17 Jan 2022 10:07 AM PST When Europeans migrated to the New World, they brought with them many diseases that ravaged the native human populations, which had no immunity due to a lack of domesticated animals. However, both populations already had domesticated dogs. Were there any major infections caused by a canine disease? Or did human proximity to dogs since prehistory give us immunity, and so no potential for more recent pandemics, or are our immune systems too dissimilar for transmission? [link] [comments] |
| Can volcanos release radioactive elements? Posted: 16 Jan 2022 02:41 PM PST I know uranium deposits are fairly rare, but given all the volcanoes in the world and throughout the ages I'm wondering if there was ever, or if there could be, an eruption that contained radioactive elements such as uranium in the lava and the ashes? Similarly, what about other interesting, precious metals (gold etc)? Note: Funnily enough it's impossible to Google this question as all results point to the brilliant idea to put radioactive waste IN volcanoes! [link] [comments] |
| Posted: 16 Jan 2022 12:52 PM PST I can imagine that the atmosphere might be too thin to produce lightning, but if it does happen I'm curious what it's like there. Do rovers and other instruments have to be designed for the possibility of a lightning strike? [link] [comments] |
| What is the decision process to decide which medicines becomes tablets and which becomes capsules? Posted: 16 Jan 2022 09:06 PM PST I've drunk malaria tablets which were bitter as hell, and I thought why not a capsule? It was taken beforehand (prophylactic I think) so the difference in metabolising time should not matter. On the other hand, I have had pain capsules, where I thought a tablet would have done better because it may kick in quicker. [link] [comments] |
| Posted: 16 Jan 2022 03:30 PM PST |
| Are rod cells also used in photopic vision? Posted: 16 Jan 2022 01:55 PM PST There is a plenty of sources that states that cones are used to see colors under well-lit conditions (photopic vision) and rods are used under low-light levels, because they're more sensitive (scotopic vision). However, I can't find anything, whether rods are also used in good light conditions. (I'm sorry for any mistakes. English is not my mother tounge.) [link] [comments] |
| Is the Detonation Velocity the same speed at which an explosion travels at? Posted: 16 Jan 2022 05:10 PM PST I'm arguing about a character who can outrun explosions, but I'm having trouble finding a concrete answer. Basically, I keep looking up things related to explosion speed. How fast the shockwaves move, how fast grenade fragments are launched, etc. Google keeps bringing me back to Detonation Velocity. Other users in the thread tell me that air can slow down explosions speed dramatically. The example they gave was "Soundwaves travelling at mach 12 through ice with no air bubbles in it will drop right down to mach 1if they transition into the air" However I can't find anything about that on google either, and I can't understand half of the answers it does give. Can someone give an answer on how fast explosions normally travel, and if those speeds are the same as detonation velocity or not? [link] [comments] |
| Do species with shorter life spans evolve more quickly than ones with longer life spans? Posted: 16 Jan 2022 02:27 PM PST For example would a fly evolve more quickly than a tortoise? And if yes why don't species evolve to have shorter life spans in order to evolve more quickly? [link] [comments] |
| How can some people escape Epstein-Barr virus? Posted: 16 Jan 2022 09:53 AM PST EPV prevalence for adults is about 95% worldwide. What about the remaining 5%? Are they naturally immune? Do we know why? [link] [comments] |
| Is it true that marine iguanas boil the algae they consume before digesting them? Posted: 16 Jan 2022 11:03 AM PST Hi. I'm reading Kurt Vonnegut's Galapagos and at one point it says that marine iguanas dive underwater, scoop a large amount of algae and then bask in the sun to increase their body temperature until the algae have been boil and cooked, at which point they are soft enough to be digested. It even says that the digestive system forms a kind of pressure boiler. I've found this fascinating, but I haven't been able to confirm it. I've seen many pictures of iguanas basking in the sun and information about how much and which kinds of algae they eat, but I find no mention of the boiling part. Can anyone confirm it/debunk it? [link] [comments] |
| How rare is it for humans to have extra adult teeth? Posted: 16 Jan 2022 08:01 AM PST As a child, I had to have 4 extra canine teeth removed. I had a complete extra set, top and bottom. I've only met one other person with extra adult teeth, and it was one extra tooth. My dentist said he never saw it before. Is it really that rare? [link] [comments] |
| Can some ice be harder than other? Posted: 16 Jan 2022 06:10 PM PST For example, could the ice made with a freezer be softer than the one in Antarctica? Like is ice harder at -70C than at -10C? I know ice can be thinner and support less weight (like at the surface of a lake), but is that ice less strong than other types of ice? All of this stemmed because I saw a video of someone making clear ice with no bubbles and wondered if that's stronger/harder than your average ice with bubbles. [link] [comments] |
| Why does isopropyl alcohol evaporate faster than ethanol? Posted: 16 Jan 2022 11:14 AM PST The boiling point of isopropanol is 82.5C, while ethanol is 78.3C. This makes sense to me, as iso has more hydrocarbons in its structure. However, the enthalpies of vaporization trend in the opposite direction, with ethanol requiring 204 cal/g of heat, with isopropanol only needing 159 cal/g. Can anyone please explain this to me? Thank you! [link] [comments] |
| Posted: 16 Jan 2022 02:59 AM PST Some articles about the sonic booms: Article 1, Article 2. It looks like the booms were heard by many within Alaska and parts of Canada, but as far as I can tell no one on the west coast of the contiguous US heard anything, even though it's closer to Tonga. Really curious if we know why that is and what factors affected it. I'm also curious if booms were heard anywhere else. (Tokoyo is only ~7900km miles away for example) [link] [comments] |
| Posted: 16 Jan 2022 11:16 AM PST |
| What is the maximum distance one can vertically "suck" water like a syringe? Posted: 16 Jan 2022 06:21 PM PST Suppose I have the power to submerge a fourth of a vertical, circular tube 50 feet in diameter and 500 feet high inside a deep vat of water so that the base of the tube isn't touching the base of the vat. Then, suppose I insert a rigid seal with an airtight grip around the inner edges of the tube at its submerged base and then begin pulling upwards on the seal so that the seal makes its way up through the tube while maintaining its airtight seal. The tube would remain stationary, vertical, and partly submerged the whole time I pull the seal upwards. I'd imagine that pulling the airtight seal upward would create a vacuum under the seal that, as the seal rises, would draw in/"suck" water into the tube from the vat. Would it then be possible that I pull the seal all the way up to the top of the 500 ft tube and create a water column that reaches the top of this 500 ft tube? Kind of like a syringe, but on a massive scale. I keep hearing that the most I can "suck" water upwards is around 30 feet at standard atmospheric conditions. But I found an old /askscience thread where one Redditor was saying how negative pressure and cavitation, like in a piston "sucking" up water in a tube, can help one "suck" water to a vertical height of more than a mile. Here's the old thread: The original Redditor doesn't seem to be active anymore, and the thread is years old, so I wanted to ask in a new threat. Could my syringe-like contraption be able to draw water to the top of the tube? Any inputs would be much appreciated. [link] [comments] |
| What determines the power of a tsunami wave? Posted: 16 Jan 2022 12:09 PM PST In 2011 when the Japan earthquake tsunami waves hit California, tsunami was 6" high. The waves did significant damage, ripping apart the marina docks in Santa Cruz and other Northern California coastal harbors. The tsunami from the Tonga quake yesterday was expected to be 8"-9" inches tall, yet little damage was expected. Why would a higher tsunami wave be expected to have less force than a smaller one? [link] [comments] |
| How did we contain Ebola but couldn't contain Covid? Posted: 16 Jan 2022 11:35 PM PST |
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