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A kiss is one of the most universal gestures in the world. It’s a wordless way to show affection that transcends language, ...
"A comparative approach to the evolution of kissing," was published by Evolution and Human Behavior on Nov. 19 ...
Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. “The meeting of ...
As Valentine’s Day draws near, candy hearts emblazoned with XOXO, as in “hugs and kisses,” remind us that love is in the air. But why XO? Why not AB? Or XY? It turns out that XO, which has been ...