The second key observation about laughter is that it's a vocalization, a sound. And across the animal kingdom, sounds serve the purpose of active communication. Cobras hiss to scare off predators. Dogs bark as a warning sign. Male birds sing to attract females... #KevinSimler

The second key observation about laughter is that it's a vocalization, a sound. And across the animal kingdom, sounds serve the purpose of active communication. Cobras hiss to scare off predators. Dogs bark as a warning sign. Male birds sing to attract females... #KevinSimler

— English Quotes (@english_quotes) Oct 6, 2023