Robert Provine Author Laughter: A Scientific Investigation (Viking, October 9, 2000) Professor of Neurobiology and Psychology, University of Maryland, Baltimore County Why can't you tickle yourself? Why do women laugh more at what men say than vice-versa? And why are Tickle-me-ELMO dolls so funny? There's a lot about the universal experience of laughter that we don't understand, mostly because it's been ignored as a subject of scientific study. Join Juan Williams for a discussion with a laughter scientist about why we laugh and how laughter affects us, on the next Talk of the Nation from NPR news.