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[[File:Irezumi Tattoo.jpg|400px|thumb|right]]
One of the most useful ratios in medicine, the '''tattoo-to-tooth ratio''' (or '''Ta/To ratio''') is useful in predicting poor intelligence, where a score of zero indicates high intelligence and a score of infinity indicates neverending stupidity.<ref>[http://gomerblog.com/2014/03/tattoo-tooth/ Tattoo-to-Tooth Ratio a Strong Intelligence Predictor]</ref>