Everybody knows that the Romans persecuted Christians. But a new book by Tim Whitmarsh, a professor of Greek at Cambridge University, argues that is only part of the story. The Roman empire also helped spread the religion—and although it might still have gone global without Rome, it would have looked vastly different.

To leap from ancient history to the futuristic, read our interview with Elon Musk, the world’s richest man. His future-gazing ranges from the unsettling to the downright weird. Within ten years, he thinks robots in the workplace will help usher in an era of such “amazing abundance” that money will become meaningless. You can also watch the full thing on The Insider.