/r/askscience

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Why do we have two of some organs (lungs, testicles,kidneys) but one of others (heart, liver etc..) ?

978 upvotes • String_Variable

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How deep is the sand in the Sahara Desert? What's underneath? Is there a flat surface?

978 upvotes • EnfantDesAbysses

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What is the best scientific paper you have read?

977 upvotes • generic-identity

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If you could render an object invisible using optical camouflage, would it still cast a shadow?

977 upvotes • Marnett05

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Is there a critical mass for a body of water to experience tides? If so, what is it?

977 upvotes • patthewmerry

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AskScience AMA: We are the authors of a recent paper on genetic genealogy and relatedness among the people of Europe. Ask us anything about our paper!

976 upvotes • jjberg2

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How does the elemental composition of 'average' planets change over a universe's lifetime?

976 upvotes • I_am_nightgaunt

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Is your skin and hair able to absorb and utilise vitamins and minerals from creams, lotions and shampoo?

976 upvotes • uvelify

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Where does the energy that causes tides come from?

976 upvotes • nbjax

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If contagious yawning is a sign of empathy and psychopaths are labeled for their lack of empathy, does that mean psychopaths will not contagiously yawn like the rest of us??

975 upvotes • kcface

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Why do we have two of some organs (lungs, testicles,kidneys) but one of others (heart, liver etc..) ?	978	String_Variable
How deep is the sand in the Sahara Desert? What's underneath? Is there a flat surface?	978	EnfantDesAbysses
What is the best scientific paper you have read?	977	generic-identity
If you could render an object invisible using optical camouflage, would it still cast a shadow?	977	Marnett05
Is there a critical mass for a body of water to experience tides? If so, what is it?	977	patthewmerry
AskScience AMA: We are the authors of a recent paper on genetic genealogy and relatedness among the people of Europe. Ask us anything about our paper!	976	jjberg2
How does the elemental composition of 'average' planets change over a universe's lifetime?	976	I_am_nightgaunt
Is your skin and hair able to absorb and utilise vitamins and minerals from creams, lotions and shampoo?	976	uvelify
Where does the energy that causes tides come from?	976	nbjax
If contagious yawning is a sign of empathy and psychopaths are labeled for their lack of empathy, does that mean psychopaths will not contagiously yawn like the rest of us??	975	kcface