Is the moon still there when we're not looking at it? Schrödinger's cat is neither alive nor dead, but why don't we see real cats or humans in quantum superpositions? Miriam Frankel investigates a host of quantum paradoxes, with philosopher Chris Timpson and physicists Marcus Huber and Chiara Marletto, in part 4 of Great Mysteries of Physics, FQxI's podcast series produced by The Conversation.