"The close relationship between railroad expansion and the genera development and prosperity of the country is nowhere brought more distinctly into relief than in connection with the construction of the Pacific railroads."

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Molecular genetics can show off some surprising relationships like, for example, the close relationship of whales to hippopotamuses, which I think nobody ever guessed until molecular data was looked at. The closest relatives of whales are hippopotamuses, even closer than any other cloven-hoofed animals.

— Richard Dawkins