There are all kinds of kisses. They can be tender or passionate. They can be romantic or friendly. They can even be furtive and stolen. A kiss can change the course of history. But despite its infinite nuances, a new study published in Evolutionary Anthropology claims that they all have the same origin: a grooming practice in which chimpanzees and other great apes comb their companions’ fur with their fingers and use their lips to remove debris. Humans, the research suggests, inherited a vestige of that ritual.
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