Ok, admit it: You've always wondered whether kissing is just an evolved form of pre-mastication. As a matter of fact, maybe it is.

On a special weekend podcast of Science Update, the AAAS radio show, hosts Bob Hirshon and Susanne Bard follow that question wherever it leads. And they also offer a fresh take on other stories emerging from the Annual Meeting in Chicago: How mosquitos woo. How scientists are using robots to study bird courtship. And Charles Darwin's 200th birthday.

Listen responsibly.