Descartes' Baby

Why is a forgery worth so much less than an original work of art?What's so funny about someone slipping on a banana peel? Why, as Freud once asked, is a man willing to kiss a woman passionately, but not use her toothbrush? And how many times should you baptize a two-headed twin? Descartes' Baby answers such questions, questions we may have never thought to ask about such uniquely human traits as a...