/r/askscience

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A friend photographed a huge "smoke ring" in the sky over Portland OR this morning (photo inside). Can anyone shed light on what might have caused it?

652 upvotes • K931SAR

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My parents have always put batteries in the fridge, is there any scientific data that says they'll stay longer while in the fridge?

652 upvotes • cjreije

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Eggs are a big investment for birds, so why do chickens lay unfertilized eggs? Why don't they 'hold on' to that investment until it's fertilized?

652 upvotes • saad85

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If I take an ant (or a few) and move it 5,000 miles from its colony, what does it do?

652 upvotes • valeriepieris

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What is the SPF equivalent of having dark skin?

652 upvotes • Barracloughfreekarma

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Hospital staff have always been very careful, but with Covid-19 they are being even more careful. Has this had an impact on other hospital based infections?

652 upvotes • Dr_Wreck

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If Cicadas are supposedly returning this Summer after 17 years of slumber, then what are the bugs I've been hearing every Summer night for years?

651 upvotes • pisstones

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If it's true that under a certain depth of water blood appears green, why is that?

651 upvotes • Slaugh

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Do thin people have more sensation on their skin because their nerves aren't as spread out?

651 upvotes • lecherous_hump

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How do those old-timey underwater naval mines even work?

651 upvotes • muff_marauder

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
A friend photographed a huge "smoke ring" in the sky over Portland OR this morning (photo inside). Can anyone shed light on what might have caused it?	652	K931SAR
My parents have always put batteries in the fridge, is there any scientific data that says they'll stay longer while in the fridge?	652	cjreije
Eggs are a big investment for birds, so why do chickens lay unfertilized eggs? Why don't they 'hold on' to that investment until it's fertilized?	652	saad85
If I take an ant (or a few) and move it 5,000 miles from its colony, what does it do?	652	valeriepieris
What is the SPF equivalent of having dark skin?	652	Barracloughfreekarma
Hospital staff have always been very careful, but with Covid-19 they are being even more careful. Has this had an impact on other hospital based infections?	652	Dr_Wreck
If Cicadas are supposedly returning this Summer after 17 years of slumber, then what are the bugs I've been hearing every Summer night for years?	651	pisstones
If it's true that under a certain depth of water blood appears green, why is that?	651	Slaugh
Do thin people have more sensation on their skin because their nerves aren't as spread out?	651	lecherous_hump
How do those old-timey underwater naval mines even work?	651	muff_marauder