Prof Alice Roberts, NASA Chief Scientist Ellen Stofan & Dr Lauren Gavaghan

It's an interview packed show this week as Andrew, freshly back from the wonderful Cheltenham Science Festival, is joined by Professor Alice Roberts, former NASA Chief Scientist Ellen Stofan, Philosopher, scientist and poet Professor Ray Tallis and Dr Lauren Gavaghan.

Up first is Prof Alice Roberts to answer our listener Lyra's question "How do we grow?" Alice also discuess the stunning new discovery of "The first of our kind". We also hear of the Professor's forthcoming book and book tour "Tamed".

Alice is followed swiftly by Ellen Stofan who tells us about her favourite mission (Cassini) and just what it takes to be Chief Scientist at NASA. If you're looking for Andrew from now on, he'll mostly be looking at NASA's NIAC pages.

Ellen Stofan's work has laid the way for humans to walk on Mars. On this show, Ellen is followed by Professor Raymond Tallis who shares his concerns about the way politicians misuse science

Ray Tallis also mentions Jeremy Hunt's plans for the NHS and is followed on the show by NHS constultant Dr Lauren Gavaghan.

Lauren tells us why she is fighting for the NHS.