Sonia Joseph was 14 years old when she first read Harry Potter and the Methods of Rationality, a mega-popular piece of fan fiction that reimagines the boy wizard as a rigid empiricist. This rational Potter tests his professors’ spells with the scientific method, scoffs at any inconsistencies he finds, and solves all of wizardkind’s problems before he turns 12. “I loved it,” says Joseph, who read HPMOR four times in her teens. She was a neurodivergent, ambitious Indian American who felt out of place in her suburban Massachusetts high school. The story, she says, “very much appeals to smart outsiders.”