Tanganyika, East Africa. In a rural boarding school on the shore of Lake Victoria, dozens of adolescent girls began to laugh and cry uncontrollably. After trying to stem these mysterious breakouts for a month and a half, school officials gave up and sent everyone home. As the girls fanned out to their homes across the region, their behaviors spread too. Over 1000 people were affected. Families and governments enlisted all kinds of experts to give them a clue about what was going on. Eventually, an official diagnosis: mass hysteria. About two years after it began, the epidemic petered out. Nobody died. Everybody recovered.
