Professors are a fascinating breed of human. While resembling normal people in many important aspects, they do, however, have uniquely identifiable features. My observations of the subject have determined these features to include a lofty irreverence for adolescent vocabulary, an unwavering ability to remain unfazed by perplexity and a general benign indifference to popular norms.
They also have the remarkable ability to make you feel that you know a decreasingly small amount about a subject that you previously thought you knew a lot about. That amount directly decreases in proportion to the amount of time a professor spends giving you feedback on a research proposal.