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Robert Provine, a neuroscientist and professor of psychology at the University of Maryland, summarizes a decade's worth of research in this article. He concludes that laughter is primarily a social vocalization that binds people together. It is a hidden language that we all speak. It is not a learned group reaction but an instinctive behavior programmed by our genes. Laughter bonds us through humor and play. He also explores gender differences in regard to the role of laughter in communication, also laughter as a tool in romance/pair-bonding.