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Three girls started laughing. No joke. No reason. They just couldn't stop.ninteen sixty two. A boarding school in Tanzania. The laughter spread to 95 students. Hours. Then days. The school shut down.But closing the school didn't stop it. The students went home — and took it with them. Thousands infected across 14 villages. Crying. Fainting. Screaming between the laughs. Some cases lasted six months. Doctors found nothing. No virus. No toxin. No explanation.Here's the part nobody talks about. Not