For decades, every single year, scientists have visited the Galapagos and measured the beaks of a particular species of finch.

And year after year, with each generation, the beaks change, exactly as we'd expect from the weather patterns of the year before. Evolutionary biology works, and rigorous data collection backs it up.

For hundreds of years, though, science has gotten it wrong about gender, race and ethnicity. Eugenics and its brethren sound simple, but often lead to tragic outcomes.

(Source: Link)