/r/askscience

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Prior to the discovery of bacteria, how did people explain fermentation of bread, wine, beer, pickles, etc?

3272 upvotes • 1994bmw850csi

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As photosynthesis requires light, why aren't plants black to absorb the full spectrum of light, instead of green which doesn't?

3271 upvotes • Dr_Prof_Doom

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Where does the pain come from when you have a viral infection (like covid or the flu)?

3271 upvotes • lostmyinitialaccount

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Does the glass on a smartphone screen get thinner over time the more you touch it?

3270 upvotes • chw3

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Is it possible to calculate nth digit of pi for any n in a limited amount of memory?

3269 upvotes • thetimujin

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Why are there holes in the ozone layer, as opposed to the ozone redistributing itself around the layer to be equally thin everywhere?

3264 upvotes • bu-rekt

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Did all winged insects evolve from a common winged insect, or did wings evolve multiple times in insects?

3263 upvotes • [deleted]

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The temperature in space is about 3K, however there are almost no atoms in space. My understanding is that heat is essentially atomic vibrations. If there are almost no atoms, how can there be residual heat?

3261 upvotes • pm-me-with-your-tits

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So human beings have tested 2,153 nuclear bombs in the last 75 years - but I was under the impression that that many bombs set off at once would basically end the species - what has been the long term effects of all that testing on the world at large?

3260 upvotes • Gasdark

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How genetically different are mice that have evolved over decades in the depths of the London Underground and the above ground city mice?

3259 upvotes • SWithnell

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Prior to the discovery of bacteria, how did people explain fermentation of bread, wine, beer, pickles, etc?	3272	1994bmw850csi
As photosynthesis requires light, why aren't plants black to absorb the full spectrum of light, instead of green which doesn't?	3271	Dr_Prof_Doom
Where does the pain come from when you have a viral infection (like covid or the flu)?	3271	lostmyinitialaccount
Does the glass on a smartphone screen get thinner over time the more you touch it?	3270	chw3
Is it possible to calculate nth digit of pi for any n in a limited amount of memory?	3269	thetimujin
Why are there holes in the ozone layer, as opposed to the ozone redistributing itself around the layer to be equally thin everywhere?	3264	bu-rekt
Did all winged insects evolve from a common winged insect, or did wings evolve multiple times in insects?	3263	[deleted]
The temperature in space is about 3K, however there are almost no atoms in space. My understanding is that heat is essentially atomic vibrations. If there are almost no atoms, how can there be residual heat?	3261	pm-me-with-your-tits
So human beings have tested 2,153 nuclear bombs in the last 75 years - but I was under the impression that that many bombs set off at once would basically end the species - what has been the long term effects of all that testing on the world at large?	3260	Gasdark
How genetically different are mice that have evolved over decades in the depths of the London Underground and the above ground city mice?	3259	SWithnell