/u/[deleted]'s posts in /r/askscience

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What does serotonin do in the gut, why is it there and how closely related is it to the serotonin in brain?

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Is it true that scientists don't really know how gravity works? Are there any other unkowns that people generally assume are known to scientists?

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Hey askscience, can anyone explain this colorful cloud formation?

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How does the body treat/contain foreign matter, such as shrapnel?

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Is it reasonable to assume that if there is intelligent life beyond our solar system, that they may be approximately our size?

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Is it better to just sleep until you wake up or adhere to some sleep schedule?

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post heart attack

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At what distance from the Sun is the temperature in outer space that of an average day on planet Earth?

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How is the capacity for facial expressions in animals determined?

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I once read that immortality may one day be possible due to the discovery of 'immortal' jellyfish. How is it scientifically possible for jellyfish to be immortal (i.e. how does it work), and how would it ever be possible to apply this method to humans?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
What does serotonin do in the gut, why is it there and how closely related is it to the serotonin in brain?	121
Is it true that scientists don't really know how gravity works? Are there any other unkowns that people generally assume are known to scientists?	120
Hey askscience, can anyone explain this colorful cloud formation?	120
How does the body treat/contain foreign matter, such as shrapnel?	120
Is it reasonable to assume that if there is intelligent life beyond our solar system, that they may be approximately our size?	120
Is it better to just sleep until you wake up or adhere to some sleep schedule?	120
post heart attack	120
At what distance from the Sun is the temperature in outer space that of an average day on planet Earth?	120
How is the capacity for facial expressions in animals determined?	120
I once read that immortality may one day be possible due to the discovery of 'immortal' jellyfish. How is it scientifically possible for jellyfish to be immortal (i.e. how does it work), and how would it ever be possible to apply this method to humans?	120