The most important cause of the increase in autism diagnoses was the Individuals With Disabilities Education Act, a federal law that required states to provide suitable education to autistics and to create registries for them. Autism has become a trendy diagnosis, and at times a useful one to stretch. “I am incredibly disciplined in the diagnostic classifications in my research,” Judy Rapoport, a senior child psychiatrist at the National Institutes of Health, tells Grinker, “but in my private practice, I’ll call a kid a zebra if it will get him the educational services I think he needs.”

Why there’s no autism epidemic in Slate.

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