Of some things we feel that we are certain: we know, and we know that we do know. There is something that gives a click inside of us, a bell that strikes twelve, when the hands of our mental clock have swept the dial and meet over the meridian hour.

—William James

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According to the book of Genesis, God created Eve from one of Adam’s ribs. As a result, Judeo-Christian tradition long held that men had one fewer rib than women. Despite the abundance of available evidence to the contrary, that belief survived for some fifteen hundred years, until the Flemish anatomist Andreas Vesalius, a pioneer of modern anatomy and a champion of medical dissection, finally showed otherwise.