Great Apes Make Laughter-Like Sounds When They Play
Chimpanzees, gorillas and orangutans produce panting sounds during tickling and play.
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A 1962 Laughter Epidemic in Tanganyika Closed Schools
It began at a girls' school in what is now Tanzania and spread to nearby villages.
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The Scientific Study of Laughter Is Called Gelotology
Researchers examine how and why humans laugh.
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Babies Begin to Laugh at Around Three to Four Months
Laughter appears long before a child learns to speak.
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Laughter Is Contagious
Hearing others laugh can trigger laughter in the listener, even without a joke.