The difficult thing ...is to turn the real world into algebra. John Maynard Smith ,
Professor of Biology at the University of Sussex, is as much concerned with the evolution of behaviour as with that of form. He discusses with Lewis Wolpert of the Middlesex Hospital Medical School, London, how this enables him to combine three of the things which delight him most: watching animals, doing sums, and discovering that a piece of mathematics actually tells you something about the things you see while birdwatching.
Producer ALISON RICHARDS