It Only Takes Six Generations to Turn a Brown Butterfly Purple

Evolution can seem like a slow way to get things done. It took more than a billion years for Earth’s life forms to try having more than one cell. In the famous March of Progress illustration showing an ape becoming an upright human, you can almost hear the stoop-shouldered cave guy in the middle groaning, “Hurry up already!” But all that is deceptive, because evolution is also fast. It took scientists only a few quick generations of butterflies to make a brown species turn violet. In doing so,

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