The increase of territory and power of empires by force of arms has been the policy of all great powers, and it has always been possible to get the approval of their state religion.

After the First World War the economic problem was no longer one of production. It was the problem of finding markets to get the output of industry and agriculture dispersed and consumed.

As I have tried to show, science, in producing the airplane and the wireless, has created a new international political environment to which governments must adjust their foreign policies.

When the Industrial Revolution of the nineteenth century brought a rapid increase in wealth, the demand of workers for a fair share of the wealth they were creating was conceded only after riots and strikes.

As we have seen, the wireless and the airplane have made the world so small and nations so dependent on each other that the only alternative to war is the United States of the World.

Knowledge acquired in biological research is seldom directly applicable to human beings ... The results of scientific research, obtained under these conditions, cannot be applied directly to human beings who vary widely in their hereditary make-up, in their environment, and in their past health record.

Our civilization has evolved through the continuous adjustment of society to the stimulus of new knowledge.