Florence Nightingale's Polar Area Diagram:

    This may seem complicated, but after a while, even politicians could understand it.   I used it to show that many soldiers were dying of preventable causes, mostly from the unsanitary conditions in the hospitals. 

    One of my biographers says, "Florence Nightingale revolutionized the idea that social phenomena could be objectively measured and subjected to mathematical analysis. She was an innovator in the collection, tabulation, interpretation, and graphical display of descriptive statistics."