/r/askscience

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Why does our immune system need one or two injections to learn to fight a new threat and many injections to unlearn to fight a perceived threat (e.g. dust mite)? Thanks

3298 upvotes • ciufolo

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What happens to the speed of photons emitted by a moving light source? Do they travel faster than the speed of light, c?

3296 upvotes • iOfTheApple

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How significant is the genetic difference between the Northern and the Southern White Rhino?

3295 upvotes • Thoarxius

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Does launching projectiles significantly alter the orbit of Hayabusa2?

3295 upvotes • showponies

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I know everyone is excited about the Webb telescope, but what is going on with the 6-pointed star artifacts?

3295 upvotes • seeLabmonkey2020

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Do people’s core personalities change as they get older, or do they just mature and adapt?

3295 upvotes • [deleted]

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Do single-celled life forms have "behavior"? If so, what internal mechanisms or qualities drive this behavior? And if NOT, then how can they do complex things like chase each other around?

3293 upvotes • williamj35

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If someone has COVID-19 but is asymptomatic then doesn’t that mean that their immune system isn’t fighting to get rid of the virus? And if that’s the case how do they ever get rid of it?

3292 upvotes • godofdweebs

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Why is Covid testing so much easier than a year ago?

3292 upvotes • JayKayne

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How much does viral load contribute to the severity of symptoms for COVID-19?

3291 upvotes • [deleted]

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Why does our immune system need one or two injections to learn to fight a new threat and many injections to unlearn to fight a perceived threat (e.g. dust mite)? Thanks	3298	ciufolo
What happens to the speed of photons emitted by a moving light source? Do they travel faster than the speed of light, c?	3296	iOfTheApple
How significant is the genetic difference between the Northern and the Southern White Rhino?	3295	Thoarxius
Does launching projectiles significantly alter the orbit of Hayabusa2?	3295	showponies
I know everyone is excited about the Webb telescope, but what is going on with the 6-pointed star artifacts?	3295	seeLabmonkey2020
Do people’s core personalities change as they get older, or do they just mature and adapt?	3295	[deleted]
Do single-celled life forms have "behavior"? If so, what internal mechanisms or qualities drive this behavior? And if NOT, then how can they do complex things like chase each other around?	3293	williamj35
If someone has COVID-19 but is asymptomatic then doesn’t that mean that their immune system isn’t fighting to get rid of the virus? And if that’s the case how do they ever get rid of it?	3292	godofdweebs
Why is Covid testing so much easier than a year ago?	3292	JayKayne
How much does viral load contribute to the severity of symptoms for COVID-19?	3291	[deleted]