Just in time for Valentine’s Day, here’s the latest episode of Distillations. First, a chemical exploration of spit. (We produce 2-4 PINTS of it every day!!) Then, an interview with Sheril Kirshenbaum, author of The Science of Kissing. For me, her book is right up there with Mary Roach’s Bonk – good scientific fun.

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Image courtesy of Flickr user Scented Mirror.