You’ve got to love Radio 4’s brilliant Cassini-Huygens total immersion radio experience. Listen to this lot and you’ll know about as much as a grown-up with a day job should reasonably know about Saturn and the extraordinary Cassini-Huygens mission . There’s a Real stream of an excellent half hour documentary called Running Rings Around Saturn that went out last week and, if you scroll down to the bottom of the page, you’ll find an hour of extended interviews with the three principle scientists interviewed for the programme, one of whom, John Zarnecki, has been working on the mission for the whole of its 17 year life.