Kissing. About 90 percent of the world's cultures do it. But how does kissing affect our brains? Which way do most people tilt their heads? And how did the 'X' come to stand for a kiss? In this original GOOD Video, we look at the science and culture of locking lips.
For everything you could ever hope to know about the cultural history, evolution, chemistry, and biology of locking lips, check out Sheril Kirshenbaum's book, 'The Science of Kissing'.
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