D3.js visualization of the famous polar area diagram from Florence Nightingale's "A contribution to the sanitary history of the British army during the late war with Russia".

Two works served as the inspiration for this implementation:

• Mike Bostock's protovis implementation
• Understanding Uncertainty's flash implementation

A few comments. Bostock's implmentation, while visually similar to Nightingale's visualization, is wrong. First, the data is not correct. You can verify this in Nightingale's original work. Second, Bostock directly maps the wedge radius to deaths. This mistake is common. Instead, Nightingale represents deaths in terms of area, thus requiring the radius for each

This map makes use of data derived from an online petition focusing on Green Mountain College's decision to slaughter two oxen in the fall of 2012. The data is stored in a CartoDB table and visualized using the Torque library - also from CartoDB.

Adding a temporal element to the data illustrates how quickly the petition 'spread' via social media not only within the United States but throughout the world. Most locations in the United States are concentrated in areas of high population density, predominantly urban and within counties characterized by high educational attainment, above the U.S. national average income and with ready access to supermarkets.