Sheril Kirshenbaum is a science writer for the Discover Magazine blog, The Intersection, and a research scientist at the University of Texas at Austin, as well as the co-author of Unscientific America, with Chris Mooney.  She has been a guest on numerous radio shows such as The Brian Lehrer Show and The Bob Edwards Show, and is an advisor and regular contributor to NPR’s Science Fridays.

In honor of Valentine’s Day, learn about how kissing has changed since the lascivious Romans, watch the most memorable Hollywood kisses, and discover 10 rules for puckering up.