Bad Charts On Wikipedia
Jorge Cameos urges everyone to Change Bad Charts in the Wiikipedia.
Corporate annual reports and the Wikipedia are two great resources to find really bad charts. We can’t do much about corporate reports, but we can actually change the Wikipedia articles. So, here is an assignment for you: find a bad chart and replace it with one that actually makes sense from a data visualization point of view.
Here's an example, from List of U.S. states and territories by population.
Spreadsheet Page Blog
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