Marc Hartzman has an innate interest in the strange, unique stories from around the world. He’s written about ghosts, Mars, Oliver Cromwell's embalmed head, and weird things on eBay, just to name a few. His latest book, We Are Not Alone: The Extraordinary History of UFOs and Aliens Invading Our Hopes, Fears, and Fantasies, looks into the vast universe of aliens, extraterrestrials, and outer space.

We're chatting about where the term “flying saucer” came from, a few lesser-known stories, and his top alien movies and TV shows.