small multiples in my 'Introduction to Infographics and Visualization' course at UM. Rather than trying to cram tons of data into a single graph or map, spread them out over several ones to facilitate reading, I told my students.
Today, thanks to Sociological Images, I discovered this interactive example made in December 2013 by NYTimes' Hannah Fairfield, Alastair Dant, and Karen Yourish. What a beauty. It also illustrates another principle that I asked my students to remember and respect: Great information graphics are always simple, but never simplistic. They must communicate with clarity, but they must never oversimplify.