Why do we do things the way we do them? We take on customs from our ancestors, then teach them to the next generation, often without thinking. But when we take a step back, they can seem bizarre, arbitrary...and sometimes, profoundly beautiful. Join Sasha Sagan, author of "For Small Creatures Such as We," as she talks to smart, funny, interesting celebrities and scholars, uncovering just how weirdly wonderful we Earthlings can be.