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When he wasn’t blackmailing lords and being sued for l... Playfair invented the pie chart, the bar graph, and the ...

The Scottish Scoundrel Who Changed How We See Data - Atlas Obscura
http://www.atlasobscura.com/...cottish-scoundrel-who-changed-how-we-see-data?...

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When he wasn’t blackmailing lords and being sued for libel, William Playfair invented the pie chart, the bar graph, and the line graph.