Curveball

Daniel Pierce: You ever wondered if there's someone out there exactly like you? A twin or a doppelganger? The world's always been fascinated by them. In ancient times, doubleness was seen as a manifestation of the supernatural, an invention of the gods. Twins have been invaluable in neuroscience because studying them gives us insight into how environmental behavior and genetics affect things like brain aging or addiction. But twin stories touch us on a much deeper level. Why is that?

Daniel Pierce: Are we looking for a more perfect version of ourselves, the person we wish we were? Or someone to share our consuming passions? Maybe we're looking for a soul mate, someone to complete our lives. Whatever its genesis, the desire for a twin is an expression of our need to connect. Because in this vast and sometimes overwhelming universe, only our relationships with other people can help us not to feel so... Alone.