Marc West interviews astronomical artist Jon Lomberg about sending art to aliens on the Voyager space probe, The science of cocktails! Is there really such a thing? Marc West investigates at the Ultimo Science Festival with celebrity chef Manuel Terron, Ian Woolf interviews Brian Lennon at the Live Futures festival about a power source that is cheap, clean and local - geothermal power from hot rocks under our feet, and the Emissions Trading Scheme - will it work? Presented and produced by Ian Woolf