If you tickle a rat's belly, it squeals with laughter. However, we are unable to perceive this laughter as its frequency, around 50 kHz, exceeds the range of human hearing. Neuroscientist Jaak ...
Laughter transcends all languages -- and now scientists know this spontaneous response is universal across some primate species, too. The laughing patterns of human infants match those of great apes, ...
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