Magician Harry Houdini often performed an amazing escape. He was handcuffed, put inside a sack, and locked in a trunk—but he always managed to free himself. Some claimed that he had supernatural powers, but Houdini himself said that all his tricks could be explained.

When a museum in Wisconsin opened an exhibit that showed the secret of Houdini’s famous escape act, many magicians said it violated their code of ethics that prohibits revealing how tricks are performed. The exhibit proved Houdini was a magician, not a miracle worker.