Sir Peter Medawar, as his many admirers know, was not only a great scientist but a great writer. The creative energy that earned him the 1960 Noble Prize for Medecine for his pathbreaking work in immunology also fueled his many and varied writings. Books such as Pluto's Republic, The Limits of Science, and The Hope of Progress (to name but a few) made the ever-changing world of modern science accessible to non-specialists, and have since become small...