In 2021, Elon Musk started calling himself The Dogefather to signal his support for Dogecoin, a cryptocurrency based on a joke meme about a dog. That dog is now wagging the tail of the world’s economy. In this episode, Jill Lepore looks at Silicon Valley's cryptocurrency craze through the lens of some very old science fiction. Like everything else about Muskism that purports to be futuristic, this idea is a relic, whose history serves as a warning.