The proof given by Wright, that non-adaptive differentiation will occur in small populations owing to "drift," or the chance fixation of some new mutation or recombination, is one of the most important results of mathematical analysis applied to the facts of neo-mendelism. It gives accident as well as adaptation a place in evolution, and at one stroke explains many facts which puzzled earlier selectionists, notably the much greater degree of divergence shown by island than mainland forms, by forms in isolated lakes than in continuous river-systems.
The age of warrior kings and of warrior presidents has passed. The nuclear age calls for a different kind of leadership. . . . a leadership of intellect, judgment, tolerance and rationality, a leadership committed to human values, to world peace, and to the improvement of the human condition. The attributes upon which we must draw are the human attributes of compassion and common sense, of intellect and creative imagination, and of empathy and understanding between cultures.