Cool data, here is a theory. Two factors education and passion Eduction: The longer you spend in education the more people you are going to know within that d

Cool data, here is a theory. Two factors education and passion Eduction: The longer you spend in education the more people you are going to know within that discipline. Passion: The more likely you would do your job for free the more likely you would date other people who can keep up in conversation with that job. Hunters marrying other hunters would be passion Doctor, doctor would be education. Psychologist being the outlier.