Human testicles are much smaller, in proportion, to some of our primate cousins. Evolution can tell us why. But the size of other body parts is a little bit more of a mystery. The human body is a ...

Human evolution is often told as a tidy story of adaptation, yet some of our most familiar body parts still defy ...

Regrowing a missing limb is no big deal for creatures that are well-known for their regenerative "superpowers" like starfish or salamanders. But what about humans? Individual cells in your body are ...

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