In this podcast short, a strange twist of legal taxonomy causes a dispute over whether X-MEN action figures are toys or dolls and sparks a court case about what it means to be human.

Roman Mars loves to spotlight the seams and joints that make up the world around us. He's the host of an irresistible podcast called 99% Invisible--a series of tiny radio stories that provoke enormous questions. Roman joins Jad and Robert to play a few favorites, and to chat about the hidden language of design that shapes our lives--from sound effects to stuff that’s more ... concrete.

Near the end of the 19th century, a mysterious young woman with a beguiling smile turned up in Paris. She became a huge sensation. She also happened to be dead. You'd probably recognize her face yourself. You might have even touched it.

The greatest mysteries have a shadowy figure at the center—someone who sets things in motion and holds the key to how the story unfolds. In epidemiology, this central character is known as Patient Zero—the case at the heart of an outbreak. This hour, Radiolab hunts for Patient Zeroes from all over the map.

Carl Zimmer is one of our go-to guys when we need help untangling a complicated scientific idea. But in this short, he unravels something much more personal.

Kohn Ashmore’s voice is arresting. It stopped his friend Andy Mills in his tracks the first time they met. But in this short about the power of friendship and familiarity, Andy explains that Kohn’s voice isn't the most striking thing about him at all.

Our lives are filled with loops that hurt us, heal us, make us laugh, and, sometimes, leave us wanting more. This hour, Radiolab investigates the strange things that emerge when something happens, then happens again, and again, and again, and again, and again, and… well, again.

For most of human history, flight was an impossible dream. In this short, the dizzying rise and fall of a pilot whose aeronautic feats changed aviation forever and turned chancy stunts into acrobatic mastery.

Writer Ian Frazier made a startling discovery several years ago in eastern Siberia: no one he met there had ever heard of tic tac toe. In this short, Jad and Robert wonder how a game that seems carved into childhood DNA could be completely unknown in some parts of the world.

A good game--whether it's a pro football playoff, or a family showdown on the kitchen table--can make you feel, at least for a little while, like your whole life hangs in the balance. This hour of Radiolab, Jad and Robert wonder why we get so invested in something so trivial. What is it about games that make them feel so pivotal?