What do we do when we raise a child, teach a student, or educate a person as a member of society? For the French philosopher Michel Serres, all of these forms of pedagogy require painful yet exhilarating departures from home and encounters with Otherness. Like a swimmer who plunges into the river's current to reach the opposite bank, the person who wishes to learn must risk a voyage from the familiar to the strange. True education, Serres writes, takes place in the fluid middle of this crossing. To be educated is to become a harlequin, a crossbreed, a hybrid of our origins--like a newborn...