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Re:Whatever It Takes: Visualizations in E-mail with d3.js by sebg on Friday November 02, 2012 @10:57AM (#4732908)
http://en.wikipedia.org/wiki/Anscombe%27s_quartet

Four Data Sets:

Simple Statistical Summary of Each Data Set is Identical.

Visually Totally Different.

edit: fixed url - thanks @eddmc

Re:Whatever It Takes: Visualizations in E-mail with d3.js by eddmc on Friday November 02, 2012 @11:05AM (#4732953)
Your link should be: http://en.wikipedia.org/wiki/Anscombe%27s_quartet

Interesting stuff!