In this issue we venture to the very extremes of human experience. We explore the life and work of Kurt Gödel, who would have turned a hundred this year, and who stunned the maths world by pinning down the limits of logic. We tremble with NASA astronaut Michael Foale, as he tells us of a space odyssey that depended on three little equations. We map out the future of life after Armageddon. And we find out what on Earth to do with a group.