1. The Illustrated Guide to a Ph.D. by Matt Might
(reproduced here under Creative Commons License)
Imagine a circle that contains all of human knowledge:
2. What you know vs. How much you know about it
Created by Jorge Cham of "Piled Higher and Deeper" Ph.D. Comics
3. Scientists drink a lot of coffee!!
But that's ok! There are lots of papers (102 at time of publication) listing the benefits of drinking coffee.