Coincidence? I think not!

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Check out this neat website (inspired by some redditors back in the day).

coincidence chart math comparison

Basically the site shows two random graphs like the above example, where the first graph is “usage share of internet explorer” and the second graph is “annual deaths from tuberculosis“. Then people can vote whether it was a coincidence or not. The are some funny examples of statistical correlation which are just coincidence. (see the wikipedia article on Correlation does not imply causation).