This is the first episode of a two-part series on the origin of jokes and humor. The story appears in podcast feeds under the title, "Jokes, Part I: Sumer Funny, Sumer Not." Listen to part two here.

You have to go back 4,000 years, colleagues said, to find someone as fluent in Sumerian as Miguel Civil. A Catalonian-born professor with a purported photographic memory, he spent decades studying ...