/r/askscience

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Why, from an evolutionary standpoint, is it that when humans show mirth/happiness (laugh, grin, smile, etc.) we exhibit the international signal of aggression (baring our teeth).

485 upvotes • clodhen

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Can Psilocybin (magic mushrooms) increase neural plasticity in the ederly?

485 upvotes • leemobile

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If our solar system were closer to the center of our galaxy, would our night times be much brighter?

485 upvotes • Kspoonie

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Would a compass work on Mars? If not, how does Curiosity know which way is North?

485 upvotes • carboniferousP

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Why doesn't my prism refract my LED light?

485 upvotes • the1MAKER

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If the human body's response to infection is a fever because heat kills the pathogens, Aren't we delaying the healing process with fever reducing drugs?

485 upvotes • sobedog

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If the Big Bang was an explosion of space-time, and space is still expanding, is time expanding too?

485 upvotes • Absumus

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Why do Blue Whales have almost no barnacles, while Humpbacks/Grey and most of the other baleen whales have so many barnacles all over them?

485 upvotes • fsm_vs_cthulhu

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Is the universe expanding faster and faster at the same speed everywhere or is there areas where it's expanding at a different speed?

485 upvotes • ViciousFerret

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Why do balloons make a noise when they pop, or rather how does the noise get generated?

485 upvotes • wigertooods

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Why, from an evolutionary standpoint, is it that when humans show mirth/happiness (laugh, grin, smile, etc.) we exhibit the international signal of aggression (baring our teeth).	485	clodhen
Can Psilocybin (magic mushrooms) increase neural plasticity in the ederly?	485	leemobile
If our solar system were closer to the center of our galaxy, would our night times be much brighter?	485	Kspoonie
Would a compass work on Mars? If not, how does Curiosity know which way is North?	485	carboniferousP
Why doesn't my prism refract my LED light?	485	the1MAKER
If the human body's response to infection is a fever because heat kills the pathogens, Aren't we delaying the healing process with fever reducing drugs?	485	sobedog
If the Big Bang was an explosion of space-time, and space is still expanding, is time expanding too?	485	Absumus
Why do Blue Whales have almost no barnacles, while Humpbacks/Grey and most of the other baleen whales have so many barnacles all over them?	485	fsm_vs_cthulhu
Is the universe expanding faster and faster at the same speed everywhere or is there areas where it's expanding at a different speed?	485	ViciousFerret
Why do balloons make a noise when they pop, or rather how does the noise get generated?	485	wigertooods