How much does one has to "know about" a person to "know" a person? When does a stranger become an associate or acquaintance, an associate or acquaintance become a friend, and a friend become an intimate? When is a stranger no longer a stranger? How does one know when one is "close" to someone? Those questions have bothered me for quite some time. If I read a biography of a celebrity whom I have never met, and I am able to memorize the entire contents of the biography, could it be argued that I "know" the celebrity without actually having never met the celebrity? Since no human being has complete knowledge about any other human being, do we truly know anyone except for ourselves?