Pucker up! On today's episode we investigate the kiss. First, what's in the saliva we share with each other? Then we interview Sheril Kirshenbaum, author of The Science of Kissing, to find out why our ancestors starting locking lips in the first place.

SHOW CLOCK

00:00 Opening Credits

00:32 Introduction

01:29 Saliva

04:33 Interview with Sheril Kirschenbaum

12:03 Closing Credits

CREDITS

Special thanks to Jennifer Dionisio for researching this show. Additional credits available at chemheritage.org/distillations.