Before the late 19th Century, scientists actually understood very little about human reproduction. Edward Dolnick joins us to talk about the often-times hilarious lengths early researchers went to in their search for the origins of life. His book is called “The Seeds of Life: From Aristotle to da Vinci, from Shark’s Teeth to Frogs’ Pants, the Long and Strange Quest to Discover Where Babies Come From” (Basic Books).