Science Of...

Why Don't We Have Elbowcaps?

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Your arms and legs seem to be just two versions of the same body part. So why do your legs get kneecaps but your arms don't get elbowcaps? There's a good reason. Find out in the video below.

Why Don't We Have Elbowcaps?

Find out what a sesamoid bone is—and why your arms don't have any.

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Why Do We Have 10 Digits?

It might come down to simple math.

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Why Do We Have Eyebrows?

Scientists aren't totally sure, but they can guess.

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