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Gaten Matarazzo, the precocious young actor who plays Dustin on Stranger Things, has cleidocranial dysplasia,​ a condition that affects bone growth. His real disability was incorporated into his role on Stranger Things—a bully at school makes fun of his character for still having his baby teeth, something that really happens to people with cleidocranial dysplasia. Matarazzo has apparently missed out on tons of acting roles in the past because of his condition.

On The Jonathan Ross Show, Matarazzo talked about what his condition means for him right now—and how it could affect his own kids in the future.

Sources: h/t BuzzFeed