/r/askscience

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If camera lenses are circular, why do they produce a rectangular image?

8389 upvotes • TitaniumTurbine

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Do animals that sleep in multiple short "naps" (such as cats) require REM sleep the way humans do?

8389 upvotes • flaminstraight

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Why are tribal people acne free?

8370 upvotes • ResidualTechnicolor

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How would waves be any different if there was a superocean like Phantalassa. Would they be larger and more dangerous or calmer and would anything else be different?

8363 upvotes • Raygnah

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Hummingbirds flap their wings around 70 times per second during normal flight...what is the fastest natural movement that humans are capable of, either voluntary or involuntary?

8355 upvotes • imTHATitguy

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Could an identical twin who recovered from an infection donate some of their T-cells to the other twin as a form of vaccine?

8355 upvotes • frisbeedog1

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If a person catches a cold and COVID-19 at the same time, will that person get seriously sick from both illnesses, or one of the viruses will "win" the fight against the other?

8348 upvotes • Lichewitz

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Do bath salts actually have any proven beneficial effects (e.g. on eczema), and is there any real difference between using Dead Sea salt VS Himalayan salt VS Epsom salt?

8329 upvotes • HerbziKal

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If there was a bag of 10 balls, 9 white and 1 red and 10 people including you has to pick one randomly and who gets the red ball wins, does it matter what order you all pick, or is it better to go first or last with probability?

8320 upvotes • MatthewQuantum

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Why are marine mammals able to keep their eyes open under water without the salt burning their eyes?

8298 upvotes • magcargoman

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
If camera lenses are circular, why do they produce a rectangular image?	8389	TitaniumTurbine
Do animals that sleep in multiple short "naps" (such as cats) require REM sleep the way humans do?	8389	flaminstraight
Why are tribal people acne free?	8370	ResidualTechnicolor
How would waves be any different if there was a superocean like Phantalassa. Would they be larger and more dangerous or calmer and would anything else be different?	8363	Raygnah
Hummingbirds flap their wings around 70 times per second during normal flight...what is the fastest natural movement that humans are capable of, either voluntary or involuntary?	8355	imTHATitguy
Could an identical twin who recovered from an infection donate some of their T-cells to the other twin as a form of vaccine?	8355	frisbeedog1
If a person catches a cold and COVID-19 at the same time, will that person get seriously sick from both illnesses, or one of the viruses will "win" the fight against the other?	8348	Lichewitz
Do bath salts actually have any proven beneficial effects (e.g. on eczema), and is there any real difference between using Dead Sea salt VS Himalayan salt VS Epsom salt?	8329	HerbziKal
If there was a bag of 10 balls, 9 white and 1 red and 10 people including you has to pick one randomly and who gets the red ball wins, does it matter what order you all pick, or is it better to go first or last with probability?	8320	MatthewQuantum
Why are marine mammals able to keep their eyes open under water without the salt burning their eyes?	8298	magcargoman