What happens when you put a space scientist interested in looking for alien life, a geologist studying some of the earliest life on Earth, a psychologist, and a linguist in a radio studio? Well hopefully a really interesting conversation and answers to some of science's - and your - big questions, because that's the line up for our Naked Scientists "ask us anything" QnA call-in this week: you supply the questions and we'll provide the answers. Like this podcast? Please help us by supporting the Naked Scientists