“A mutation in a DNA molecule within a chromosome of a skin cell in my index finger has no influence on heredity. Fingers are not involved, at least directly, in the propagation of the species.”

—  Carl Sagan

Source: The Dragons of Eden (1977), Chapter 2, “Genes and Brains” (p. 27)

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Carl Sagan365
American astrophysicist, cosmologist, author and science ed… 1934–1996

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