Science: Air pollution + poor health

Science correspondent Laurie Winkless joins Kathryn to talk about a new study which has looked at the effects of air pollution on the health of New Zealanders and calculated the 'social cost' of human-made air pollution at $15.6 billion per year. Astronomers have spotted a mysterious radio signal that is pulsing "like a heartbeat" in deep space and dogs really can "see" with their noses, researchers have found a link between the areas of a dog's brain that handle smell and vision. Laurie Winkless is a physicist and science writer.