"The categories of woman and man are too rigid. They're going to give way to new forces. They already have, to a degree, but for most of us, this drama held sway, and we assumed our positions."

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The important point is that since the origin of life belongs in the category of at-least-once phenomena, time is on its side. However improbable we regard this event, or any of the steps which it involves, given enough time it will almost certainly happen at least once. And for life as we know it, with its capacity for growth and reproduction, once may be enough.

— George Wald