" The second thing, which is even better from where I sit, is that a science of mental illness developed such that we found that we could measure fuzzy states like sadness, alcoholism, and schizophrenia with psychometric precision. We developed a classification, a DSM, so that people in London and in Philadelphia can agree that they’re both seeing a bipolar depressive. "

― John Brockman , The Mind: Leading Scientists Explore the Brain, Memory, Personality, and Happiness