The world around us is up for discussion this week, as science writer Gabrielle Walker drops by the pod to give us a brief history of the atmosphere.
Her latest book, An Ocean of Air: A Natural History of the Atmosphere explores a different way of thinking about how we exist on the surface of the earth.
Elsewhere, things leave the Earth's atmosphere altogether, as physicist superstar Brian Cox explains the real science behind Danny Boyle's new disaster movie Sunshine.
And finally, Al Gore brought his climate change roadshow to Cambridge last week, proselytising to a gang of bigwigs including Manchester United manager Sir Alex Ferguson. Intrepid environment correspondent David Adam risked the hairdryer treatment to hear the zillionth iteration of the Inconvenient Truth speech.
