Anti-stars, vitamin A's role in an ill-fated exploration

Science commentator Allan Blackman joins Kathryn to look at a new study that backs the existence of antistars. Today marks the birthday of Antarctic explorer Sir Douglas Mawson - and there are two views about whether vitamin A might have made his travails more horrendous. And science you can use at the pub: how many bubbles are in your glass of beer? Allan Blackman is a Professor of Chemistry, School of Science, Auckland University of Technology.