Great ape laughter reveals 15-million-year evolutionary path to human speech

Beneath the surface differences of species and habitat, all great apes share a rhythmic heartbeat in their laughter — one that has persisted, largely unchanged, for 15 million years. Researchers at the University of Warwick, analyzing 140 laughter sequences across five great ape species, found this ancient vocal pattern pointing to a single common ancestor, offering a rare biological fossil of sound in a domain where no physical fossils exist. Human laughter has since grown faster, more varied, and consciously malleable, suggesting that the capacity for speech was not a sudden gift but the cul