Signing, Singing, Speaking: How Language Evolved

"The Earth would not be the way it is if humankind didn't have the ability to communicate, to organize itself, to pass knowledge down from generation to generation," says Jeff Elman, a professor of cognitive science at the University of California, San Diego. "We'd be living in troops of very smart baboons," he says.

Instead, language has allowed us to cooperate in groups of millions instead of dozens, he says. It also lets us share the complex ideas produced by our brains, and it's flexible in ways you don't find in the communication systems of other species.


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