Tuberculosis in its various forms is the commonest of all the important diseases of civilised lands. It accounts for some 50,000 deaths a year in England and Wales ; that ls to say, about one death in every ten is due to tuberculosis. The popular idea is that a young adult who develops pulmonary consumption has of necessity recently been infected by a relative, a companion, or a fellow-workman,...

Public goods and common-pool resources are fundamental features of biological and social systems, and pose core challenges in achieving sustainability; for such situations, the immediate interests of individuals and the societies in which they are embedded are in potential conflict, involving game-theoretic considerations whose resolution need not serve the collective good. Evolution has often ...