"that each ejaculation contains several billion sperm cells -or roughly the same number as there are people in the world- which means that, in himself, each man holds the potential of an entire world. And what would happen, could it happen, is the full range of possibilities: a spawn of idiots and geniuses, of the beautiful and the deformed, of saints, catatonics, thieves, stock brokers, and high-wire artists. Each man, therefore, is the entire world, bearing within his genes a memory of all mankind. Or, as Leibniz put it: "Every living substance is a perpetual living mirror of the universe."