What does the data for covid show regarding transmittablity outdoors as opposed to indoors?

What does the data for covid show regarding transmittablity outdoors as opposed to indoors?
How was the first magnet created? How would I create a magnet in absence of electricity or other strong magnets?
Is muscle pain after vaccination, caused by the immune system’s reaction to it, or because the muscle was cut a little with the needle?
Do animals experience epidemics? If so, how do they handle it?
How are the expiration dates for foods determined?
How is the flu shot updated? How do scientists know how the flu is mutating for the next year?
Why are sonogram images that weird wedge shape?
Can you test for previous COVID-19 exposure?
The CMB has a peak energy of 0.0006626 eV when it reaches us after redshifting for about 14 billion years. What's the initial energy of such a photon, almost 14 billion years ago?
Early news about the new Covid variants suggested that they have about the same virulence as the original. Is there any new data on the virulence of these variants?
Why do we get the feeling like we're falling and jolt when we're trying to sleep?
Are stars that are visible from Earth a lie?
Do everyone have a wisdom teeth? If so what happens to those who can't afford to have a surgery? Is it always necessary to remove a person's wisdom teeth?

Posted: 15 Jan 2021 04:31 PM PST

submitted by /u/Buy_More_Bitcoin
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How was the first magnet created? How would I create a magnet in absence of electricity or other strong magnets?

Posted: 16 Jan 2021 03:59 AM PST

For example, lets say I've been thrown back in time to 1000 BC. I want to introduce civilization to the wonders of electricity, so the first thing I need is a strong magnet. The only sources of ferromagnetic material I know of are Lodestones, which I understand are only quite weakly magnetic.

So it got me to thinking...once you have a strong magnet, and once you can create electricity, creating more magnets is significantly easier. But how were the first strong magnets created?

There's surprisingly little written about how to make a magnet in lieu of other magnets

Or, put another way, if you got thrown back in time how would you go about generating electricity for your deLorean?

submitted by /u/Exoddity
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Is muscle pain after vaccination, caused by the immune system’s reaction to it, or because the muscle was cut a little with the needle?

Posted: 15 Jan 2021 02:09 PM PST

For example if someone got a vaccine in one arm and just stabbed with a needle in the other, would both arms feel the same?

What if the non vaccine arm was injected with saline but no vaccine ?

submitted by /u/gilbertopr16
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Do animals experience epidemics? If so, how do they handle it?

Posted: 15 Jan 2021 01:25 PM PST

I understand humans have epidemics and pandemics, and we're in one right now. I would assume animals do experience some sort of similar thing. However, do these disease outbreaks have major effects on the populations? Have there ever been any species wiped out by disease? And do any animals have certain precautions dealing with disease?

submitted by /u/FoughtStatue
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How are the expiration dates for foods determined?

Posted: 15 Jan 2021 03:27 PM PST

I've been paying more attention to expiration dates and I've always been curious what the research is behind certain dates.

submitted by /u/triggered_trombone
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How is the flu shot updated? How do scientists know how the flu is mutating for the next year?

Posted: 15 Jan 2021 09:21 AM PST

The Flu Jab is a yearly vaccine to stave off Flu from those that are most vulnerable, as well as to others to help reduce the spread. It's a yearly shot as the flu strain changes quite quickly. But how do we know how its mutated in time to get the vaccine approved and distributed?

submitted by /u/Money_on_the_table
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Why are sonogram images that weird wedge shape?

Posted: 15 Jan 2021 08:46 AM PST

submitted by /u/halfhalfnhalf
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Can you test for previous COVID-19 exposure?

Posted: 15 Jan 2021 04:11 PM PST

Is there a way to test to see if you've previously been COVID positive, but you didn't know at the time because you were asymptomatic?

Thanks!

submitted by /u/fellowshrimp
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The CMB has a peak energy of 0.0006626 eV when it reaches us after redshifting for about 14 billion years. What's the initial energy of such a photon, almost 14 billion years ago?

Posted: 15 Jan 2021 03:28 PM PST

submitted by /u/mobydikc
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Early news about the new Covid variants suggested that they have about the same virulence as the original. Is there any new data on the virulence of these variants?

Posted: 15 Jan 2021 03:14 PM PST

submitted by /u/Intagvalley
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Why do we get the feeling like we're falling and jolt when we're trying to sleep?

Posted: 15 Jan 2021 12:50 AM PST

submitted by /u/r4wm4ws
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Are stars that are visible from Earth a lie?

Posted: 15 Jan 2021 11:09 AM PST

This question came to my mind while I was looking at the night sky and thinking that the stars are light-years away from us. Don't most stars that we "see" die out before their light can reach Earth?

submitted by /u/termuxuser
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Do everyone have a wisdom teeth? If so what happens to those who can't afford to have a surgery? Is it always necessary to remove a person's wisdom teeth?

Posted: 14 Jan 2021 09:22 PM PST

submitted by /u/IwantUandUwantme2
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