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Pie spy

First pie chart

The inventor of the pie chart and the bar chart was also a secret agent who helped collapse the French revolutionary government’s economy through an elaborate counterfeiting operation.

Kidney stone paradox

Simpson's paradox

Statistics are tricky. Consider this: of two treatments for kidney stones, Treatment A is better on average for large stones and small stones. But consider all stones together and Treatment B is better. This is Simpson’s paradox.