Can a person test negative for COVID, but still be contagious? (Assuming that person is in the process of being COVID positive) |
- Can a person test negative for COVID, but still be contagious? (Assuming that person is in the process of being COVID positive)
- Post Covid Mucormycosis is a growing concern in India. How common is it and where does it come from?
- Do some Grand Unified Theories predict no Proton decay?
- Is it possible that COVID-19 could mutate to become non-functional?
- How did the vaccine creators know which mRNA subsequence to choose from the genome of SARS-CoV-2?
- How do fish survive in frozen lakes?
- Why don't we always get immunity to diseases that we have had once before?
- How does mercury get into the ocean to accumulate in sharks and other large fish?
- Why does metal have a smell?
- How Does An Axial Compressor Work?
- Is Saltation what causes ripples in both sand and clouds?
- If an object is in an elliptical orbit around a black hole with an apogee very close to the event horizon, would the object appear to pause to an outside observer for an extended period of time as it orbited?
- Why is the speed of sound so significant in fluid flow? Is that only to determine if the flow is compressible or not?
- What happens to Covid-19 in an exposed individual that didn't reach enough viral load to cause illness??
- For people with the photic sneeze reflex, why doesn't pupil dilation trigger sneezing fits?
- Can anyone help me understand the 2D nature of Anyons?
- Why do we need bandwidth of a certain size when transmitting a signal in wireless network?
- What are complementary flavors (i.e. chocolate/orange)? Is it a biological or chemical reason why we like them?
- How closely related are the two bird groups, palaeognathae and neognathae, to each other?
- Is there any evidence of large damage or disturbances in the earths crust opposite (the anticenter) of the Chixulub impact that caused the K/T extinctions?
- Now that we have shown the mRNA vaccines work, and have one specifically for a coronavirus, how fast could we likely create a vaccine for a future coronavirus pandemic?
| Posted: 24 Dec 2020 03:24 AM PST |
| Post Covid Mucormycosis is a growing concern in India. How common is it and where does it come from? Posted: 23 Dec 2020 10:55 AM PST Just a simple question, further details about some cases in the link above. This condition seems a bit dangerous to just suddenly come out of nowhere, and is the first time I'm hearing about it. EDIT: Another news article which claims experts have said mostly heavily immunocompromised like cancer patients, organ transplant patients and diabetics are in danger of infection. [link] [comments]  |
| Do some Grand Unified Theories predict no Proton decay? Posted: 24 Dec 2020 04:47 AM PST So, possibly the best way to test a grand unified theory is to look for proton decay, in which the grand unified strong force re-emerges as an X-boson and turns a proton into a pion (which turns into 2 photons soon after) and positron, however, since there seems to be no evidence for a grand unified force that would force the proton to decay, are there any grand unified theories that say protons won't decay? Or do all of them predict proton decay, and if proton decay as a whole is ruled out (which seems to be the case with current evidence), no grand unified theory is right? [link] [comments]  |
| Is it possible that COVID-19 could mutate to become non-functional? Posted: 24 Dec 2020 06:19 AM PST Sorry if this has been asked before or if it's a stupid question. But I remember either hearing or reading somewhere that viruses can mutate to become non-functional. Could this ever happen with the Sars-Cov-2 virus? If so, would that mean that it couldn't infect people anymore & the pandemic would just be over? Also, is there anything that determines whether or not a virus will mutate to become non-functional, or does it happen randomly? Thanks in advance, looking forward to hearing the responses :) [link] [comments]  |
| How did the vaccine creators know which mRNA subsequence to choose from the genome of SARS-CoV-2? Posted: 23 Dec 2020 04:58 PM PST I understand the creators of the mRNA vaccine took the DNA genomic sequence of SARS-CoV-2, found the subsequence that referred to the spike protein, and are now mass producing that sequence as mRNA. But how did they know which subsequence referred to the spike protein and not some other irrelevant part of the virus? [link] [comments]  |
| How do fish survive in frozen lakes? Posted: 23 Dec 2020 08:52 PM PST When lakes freeze over during winter. Only the surface freezes and apparently the fish etc survive in the water below the surface. How is the oxygen in the water replenished through the ice? Wont the fish use up all the oxygen and then suffocate to death [link] [comments]  |
| Why don't we always get immunity to diseases that we have had once before? Posted: 23 Dec 2020 06:25 PM PST |
| How does mercury get into the ocean to accumulate in sharks and other large fish? Posted: 23 Dec 2020 11:21 PM PST |
| Posted: 23 Dec 2020 11:15 AM PST |
| How Does An Axial Compressor Work? Posted: 23 Dec 2020 08:18 PM PST Hi r/askscience! History major here with a physics question. After watching a number of videos from the "primitive technology" genre on youtube, I've become fascinated with the origins of iron smelting and would eventually like to attempt to smelt and forge my own wrought iron using locally sourced materials like some of these youtubers have done. For my bellows, I was hoping to make a primitive blast furnace, essentially, using a waterwheel powering a primitive wooden axial compressor to supply the air needed for smelting. After trying to learn more about their workings, I came across this gif on the wikipedia page for such compressors and was puzzled when I saw that the blades/turbines that spin alternate with ones that remain stationary. So my questions are the following: Why do some blades in an axial compressor (or a jet engine, for that matter) rotate while others do not? My headcannon says all parts that look like they spin in a jet engine do spin, but evidently this was not the case and I know little of aeronautics. For my materials scientists, would an amateurly crafted axial compressor be a good bellows as opposed to traditional methods such as hand-pumped leather bellows or flap/push bellows as used in east Asia and elsewhere? Performance to an actual jet engine/modern air compressors is not anticipated or expected, only enough airflow to smelt relatively small quantities of iron ore. I settled on a jet engine-esque design because keeping rotary motion from a waterwheel and maintaining that motion in the bellows strikes me as an efficient use of energy, but I could be wrong. [link] [comments]  |
| Is Saltation what causes ripples in both sand and clouds? Posted: 24 Dec 2020 04:02 AM PST I've done some cursory googling. It seems rippling in sand is called saltation. But I can't find anything that connects saltation to the phenomenon of ripples underwater and also ripples in clouds. To me they all seem connected, and saltation does define itself as a fluid moving over a substance (such as sand) so presumably that definition also applies for underwater and in the clouds. Just curious if anyone has seen these various appearances of rippling connected in any way? pictures: [link] [comments]  |
| Posted: 23 Dec 2020 07:58 AM PST I'm really interested by time dilation effects (a la interstellar) but I haven't been able to wrap my head around understanding how much effective time dilation someone could experience. It occurs to me that if you were in a ship with an elliptical orbit and you set your apogee very near the event horizon you might experience significant time dilation as your swing around the black hole, but I haven't been able to ascertain the quantity of time dilation (eg a minute here is seventy years) one could experience with each orbit. [link] [comments]  |
| Posted: 23 Dec 2020 09:44 PM PST |
| Posted: 23 Dec 2020 08:53 AM PST There are so many discussions on preventative measures to minimize our exposure to the virus--what exactly happens if some virus did make it through your system, but the viral load isn't sufficient to make you sick? Do they stay in your body? does your body destroy the little amount that's there? how frequent do multiple exposures (for whatever reasons...) have to happen for the cumulative effect to be there? [link] [comments]  |
| For people with the photic sneeze reflex, why doesn't pupil dilation trigger sneezing fits? Posted: 23 Dec 2020 10:50 AM PST Another post about sneezes reminded me of this: Like a lot of other folks, I sneeze when exposed to bright sunlight (or even a bright incandescent bulb -- not fluorescent, though). Yet when I have my pupils dilated at my annual eye exam, I don't burst into sneezes as soon as I leave office, like I would expect to. Any idea why? [link] [comments]  |
| Can anyone help me understand the 2D nature of Anyons? Posted: 23 Dec 2020 01:46 PM PST I came across this article today, but it doesn't really explain anything beyond 'these exist and this is how they kind of interact.' But what exactly is a 2D system? I feel like that might be describing something more mathematical than physical, but.. Edit (hope it's allowed): I should have specified that I am not a physicist and I would appreciate a really simplified answer, eli5-style, if possible.. thank you! [link] [comments]  |
| Why do we need bandwidth of a certain size when transmitting a signal in wireless network? Posted: 23 Dec 2020 10:09 AM PST I come from a CS background so my EE and signal theory is not that great. So I was studying wireless networks (let's take the old 802.11b standard) where (for ex) we have a bandwidth of 20MHz per channel and a carrier signal at 2.4GHz more or less depending on the channel. Let's imagine a basic scenario where we have a simple modulation where one high frequency is a 1 bit and a low frequency withing the bandwidth is a 0. My question is: why do we need all the 20MHz? Will we actually utilize them just changing between these 2 frequencies? And if we take more advanced modulations like amplitude or phase, then do we still need to utilize all those 20MHz just to change amplitude? Shouldn't changing power change the amplitude? How are frequencies related to changing amplitude? Moreover I remember my professor of an unrelated subject saying that "a rule of thumb without any fancy modulation or anything is that 1 Hz = 1 bit transmitted" but still this implies that we utilize all the bandwidth even if we are just using 2 frequencies (1 high and 0 low). How does that work? Thanks! [link] [comments]  |
| Posted: 23 Dec 2020 07:29 AM PST |
| How closely related are the two bird groups, palaeognathae and neognathae, to each other? Posted: 23 Dec 2020 08:16 AM PST I read in a comment that they're not actually all that closely related, having diverged from each other by 100 million years. If by stroke of faith that all of the palaeognathus died out during the kpg extinction event, we wouldn't even consider them true birds but close bird relatives. [link] [comments]  |
| Posted: 23 Dec 2020 07:24 AM PST Was there damage caused by focused reverberations of the impact? I understand that the crust is variable in composition & thickness so any effects may not be found at the exact anticenter, but were there any huge and or still visible disruptions, as in volcanoes or earthquakes, focused on basically the opposite side of the globe from the impact? [link] [comments]  |
| Posted: 23 Dec 2020 08:59 AM PST And how fast could we do it if we used challenge trials? What is the fastest-possible timeline the next time around? [link] [comments]  |
| You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now. | Email delivery powered by Google |
| Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States | |
No comments:
Post a Comment