When she was about 11 years old, Greta Thunberg was diagnosed with Asperger syndrome, which is now considered an autism spectrum disorder. It is characterized by abnormalities in social interactions (as in classic autism) but with normal intelligence and language development. People with Asperger syndrome tend to focus deeply on one idea or interest, and Thunberg’s cause became climate change. While acknowledging that Asperger had hampered her in some ways, Thunberg also noted its advantages, at one point tweeting: “I have Aspergers and that means I’m sometimes a bit different from the norm. And—given the right circumstances—being different is a superpower.”