The Role of the Southern Ocean and Arctic in Ocean Productivity

Chris Berrow and the Naked Scientist team present the week's science news. In today’s programme we look at the heatwaves sweeping across Europe; how babies in the womb use a “greedy” gene to get more food from mum; and why do tennis players take so long to choose a ball to serve with?

Plus we look at some of the ways scientists are trying to protect our planet’s oceans.