It is clear that the nations of the world now can only rise and fall together. It is not a question of one nation winning at the expense of another. We must all help one another or all perish together.
Carl SaganSome racists still reject the plain testimony written in the DNA that all the races are not only human but nearly indistinguishable. . . .
Carl SaganThe secrets of evolution are death and time-the deaths of enormous numbers of lifeforms that were imperfectly adapted to the environment; and time for a long succession of small mutations.
Carl Sagan