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Before the joke, there was laughterAs the human brain evolved, humans were able to laugh before they could speak, according to a new study.But here's the punch line: Laughter and joy are not unique to humans, the study says. Ancestral forms of play and laughter existed in other animals long before humans began cracking upIn studying laughter, scientists have focused mostly on related issues—humor, personality, health benefits, social theory—rather than laughter itself.