One that of course has no practical application in the real world, LOL.

"I think the subject which will be of most importance politically is mass psychology. Mass psychology is, scientifically speaking, not a very advanced study... This study is immensely useful to practical men, whether they wish to become rich or to acquire the government. It is, of course, as a science, founded upon individual psychology, but hitherto it has employed rule-of-thumb methods which were based upon a kind of intuitive common sense. Its importance has been enormously increased by the growth of modern methods of propaganda. Of these the most influential is what is called 'education'. Religion plays a part, though a diminishing one; the Press, the cinema and the radio play an increasing part." - Bertrand Russell, 1952 (p40) [1]