The scientific study of kissing is "philematology" Follow Michael Stevens: http://www.twitter.com/tweetsauce Sources and links to learn more: Kissing facts: http://www.psychologytoday.com/blog/let-their-words-do-the-talking/201212/odd-facts-about-kissing Longest kiss: http://www.guinnessworldrecords.com/records-1/longest-kiss/ general info on kissing: http://anthropology.net/2007/03/09/why-do-we-kiss/ http://intro2psych.wordpress.com/2009/05/13/the-evolution-of-a-kiss/ http://en.wikipedia.org/wiki/Kiss birds kissing ("billing"): http://en.wikipedia.org/wiki/Beak#Billing http://en.wikipedia.org/wiki/Kiss kiss researcher interview [video]: https://www.youtube.com/watch?v=mun5nXXy6II pac man's shape: http://pacmanmuseum.com/history/Toru-Iwatani.php premastication: http://en.wikipedia.org/wiki/Premastication http://en.wikipedia.org/wiki/Courtship_feeding Alicia Silverstone premastication