“Alice”, said Roger Highfield. “You’ve always gone on about how badly the human body is designed when you get down to the detail, the nitty gritty. Well, now I’m going to throw down a challenge: if it’s as bad as you say it is, if it’s so easy to see how to tweak it for the better - do it! And I want it here, in the Science Museum, in 3 months’ time”.