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" "centuries would yet pass before the mighty works of fifty generations of humans would decay past use. Only the declining powers of men, themselves, rendered them useless now.
Isaac Asimov (c. 2 January 1920 – 6 April 1992) was a Russian-born American biochemist who was a prolific writer of both fiction and non-fiction, his works include the Foundation series and I, Robot.
Biography information from Wikiquote
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Humanity today forms a single species and can interbreed freely. Differences in color of hair, skin and eyes are largely due to differences in the quantity of a pigment called melanin, and this does not affect humanity's essentially unitary character. Nor do differences in the shape of the eye or nose, in the shape of the skull, or in height.