The famous biologist takes the position that civilization must recreate itself with an acknowledge social outlook, if the present state of world affairs is to be improved upon. To this end, biology has some relevance to the task. He then proceeds to analyze the basis of man's uniqueness among animals, -- his capacity for thought and speech, the cumulative traditions, his aptitude in the use of tools, the developments of techniques and skills. He indicates the different processes of evolution, the variability of man, the psychological and social characteristics. And from this basis he pleads for eugenics, for selection, he explodes the racial myths, he demonstrates the importance of climate in human history. In addition to his main theme, the text includes his review of Who's Who. The Analysis of Fame; his essays on Scientific Humanism, on Religion as an Objective Problem, and a final essay, Is Life Worth Living? Huxley is a scientist laymen can read.