A passionate advocate of scientific endeavour, Medwar wrote, lectured and reviewed widely, describing the glories of scientific achievement and warning of the dangers of pseudo-scientific deception. In his view the greatest threat is posed not by science itself, but by a misunderstanding of science. A tireless searcher after truth and merciless debunker of myths, he was famous not only for his work in immunology, but also for the astonishing power and clarity of his writing, which had made - and continues to make - an incalcuable contribution to the public understanding of science. This selection, made posthumously from essays now unavailable elsewhere, and including some previously unpublished material, covers a characteristically wide range of subjects: genetics, evolution, creativity, philosophy, scientific fraud, how to survive in hospital after a stroke, and attitudes to death and the prolongation of life. In includes the 1959 Reith Lectures "The Future of Man" and a hitherto unpublished transcript of a BBC interview, "My Life in Science".