/r/askscience

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What makes a metal an ohmic conductor or a non-ohmic one?

838 upvotes • JustANyanCat

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Why is the Earth not tidally locked with the Sun?

838 upvotes • feed2brdswitonescone

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Given E=mc^2, if the mass of photons is zero, why does light have non-zero energy?

837 upvotes • magiccheese

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Has there been an optimal design for a fan or fan blade created yet? If so, Why isn't it used in every application that requires a fan?

837 upvotes • bintu

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If childbirth is one of the most painful experiences one can go through, how come it does not render the person unconscious as when having other forms of pain inflicted?

836 upvotes • Farstucks

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Why is smiling (teeth-baring) considered friendly in human behavior, but seen as a hostile gesture to certain animals?

836 upvotes • KingOfGingers

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How was the Soyuz able to get to the ISS in 6 hours instead of 2 days?

836 upvotes • flyingmike

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If two men had sex with the same woman consecutively, would one be more likely to impregnate her?

836 upvotes • pacosmondernwife

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So.. can the Iris (colored/pigmented area around the pupil) change hue depending on mood, or is this some stupid myth?

836 upvotes • Xahtier

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What am I really smelling, when I smell rain coming?

836 upvotes • Binary_Omlet

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
What makes a metal an ohmic conductor or a non-ohmic one?	838	JustANyanCat
Why is the Earth not tidally locked with the Sun?	838	feed2brdswitonescone
Given E=mc^2, if the mass of photons is zero, why does light have non-zero energy?	837	magiccheese
Has there been an optimal design for a fan or fan blade created yet? If so, Why isn't it used in every application that requires a fan?	837	bintu
If childbirth is one of the most painful experiences one can go through, how come it does not render the person unconscious as when having other forms of pain inflicted?	836	Farstucks
Why is smiling (teeth-baring) considered friendly in human behavior, but seen as a hostile gesture to certain animals?	836	KingOfGingers
How was the Soyuz able to get to the ISS in 6 hours instead of 2 days?	836	flyingmike
If two men had sex with the same woman consecutively, would one be more likely to impregnate her?	836	pacosmondernwife
So.. can the Iris (colored/pigmented area around the pupil) change hue depending on mood, or is this some stupid myth?	836	Xahtier
What am I really smelling, when I smell rain coming?	836	Binary_Omlet