http://www.businessinsider.com/the-illustrated-guide-to-a-phd-2012-3 Every fall, I explain to a fresh batch of Ph.D. students what a Ph.D. is. It's hard to describe it in words. So, I use pictures. Read below for the illustrated guide to a Ph.D. Imagine a circle that contains all of human knowledge: By the time you finish elementary school, you know a little: By the time you f..