Update: Paul Van Slembrouck, the designer of this graphic, has responded to the critique. Be sure to read his comments below!
I am a teaching fellow for a class at Harvard called “The Art of Numbers,” which teaches principles of data presentation to undergraduates from all concentrations. For a recent midterm, students were asked to analyze this graphic from Visual.ly:
For valentine’s day Visual.ly posted a series of visualizations of divorce statistics in the U.S.. Several aspects about this graph bothered me, and I thought it would make for a good exam question.