Science: Immune system discovery, Voyager longevity

Science correspondent Allan Blackman joins Kathryn to talk about a new part of the immune system that's been discovered and how it could be a goldmine of potential antibiotics. NASA has switched off two instruments on its Voyager 1 and Voyager 2 spacecraft in order to preserve their lifespan. The two craft are in interstellar space after their launch in 1977 - having travelled a combined 46 billion kilometres to be the farthest human-built objects from Earth. And could footballers' fingers and height predict their exercise performance?