At some point, anticipated and even feared by some parents, every child asks the inevitable question: “Where did I come from?” That question is endemic to humanity. The question of our own biological origins is eventually inescapable. Our existence requires an explanation, and the question takes bold form. The answer used to be easy.

That is, the answer was easy in terms of biology. In some form, the answer took the shape of a story about two people, one male and one female, who came together and made a baby. Mommy and Daddy made a baby. That story was both true and universal. For most of human history, there was no alternative account. The answer given by parents in 1960 was the same as that given in 1060 or in any previous year.

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