When computers came along, I felt for the first time that I had the proper tools for the kind of theoretical work I wanted to do. So I moved over to that, and that got me into psychology.

To deal with these problems - of world population and hunger, of peace, of energy and mineral resources, of environmental pollution, of poverty - we must broaden and deepen our knowledge of nature's laws, and we must broaden and deepen our understanding of the laws of human behavior.