From December 27, 1831, to October 2, 1836, the HMS Beagle set out on a scientific survey expedition in the Atlantic and Pacific Oceans. On the ship was a young man named Charles Darwin. That expedition exposed him to ideas that would develop his theory of natural selection which would revolutionize the world of biology. This episode is not about that theory, however. This is about his OTHER theory that he developed from that expedition.

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