It's Okay to Be Smart

The Science of Kissing

Season 2 Episode 3 | 5m 25s

When you really think about it, kissing is an odd human behavior. You know, all the rubbing of our faces all over each other. So there must be a good reason why we do it, right? From motherly comforts to testing the genetic compatibility of your "mate" . . . the science of kissing is pretty awesome

Aired: 04/14/16

Rating: NR

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