The Spurious Correlations website by Tyler Vigen is a great site for showing how you must think carefully before you link data together and show a correlation as you can to that for completely unrelated data.
The one on the front of his website at the time I wrote this entry shows US spending on science, space, and technology correlates with Suicides by hanging, strangulation and suffocation. Of course it doesn't and shouldn't if you think about it, but they look like they do.
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