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Fins, wings, and...fractions? Find out how simple measurements revealed a striking convergence among animals as varied as whales, birds, and sea butterflies. (Wondering what a sea butterfly is? [...]

What do aching knees, a sore back, diabetes, and poor eyesight have in common, besides being, well, common? You’ll find out in this lesson, but here’s a hint: it has something to do with evolution.

Think that evolution always results in disadvantageous traits becoming less common in a population? Think again.

Modern computer modeling unveils something surprising about a classic example of evolutionary convergence and divergence: the Anolis lizards of the Caribbean.