Science with Jen Martin: Kiss evolution + seagull shouting

Science commentator Jen Martin joins Kathryn with three fascinating studies. The first suggests that kissing may have evolved 21.5 million years ago. Ever had your chips eyed up by a greedy seagull? This study suggests that yes, shouting at them, probably works. And researchers have found being a famous singer can raise your risk of an early death - but why? Jen Martin founded the science communication program at the University of Melbourne, runs the espressoscience.com blog and is also the author of Why Am I Like This?: The Science Behind Your Weirdest Thoughts and Habits.