On December 27, 1831, the young naturalist Charles Darwin left Plymouth Harbor aboard the HMS Beagle. For the next five years, he conducted research on plants and animals from around the globe, amassing a body of evidence that would culminate in one of the greatest discoveries in the history of mankind-the theory of evolution. Darwin presented his stunning insights in a landmark book that forever altered the way human beings view themselves and the world they live in. In The Origin of Species .
