SpaceX and NASA compete to get people back to the Moon, Richard meets a man who grows space tomatoes in human urine, and heads to a lab where volunteers are being paid to stay awake. This month, Richard Hollingham and Sue Nelson are joined by rocket scientist David Wade, and space scientist Helen Fraser to discuss how ice in space could form planets and celebrate the 80th birthday of Valentina Tereshkova. Like this podcast? Please help us by supporting the Naked Scientists