Some of my recent posts have been on the subject of mental math. Well have you ever spent any time trying to mentally figure out the 13th root of a randomly selected 200 digit number? (For those that don't know the 13th root of a number would be a number that when taken to the 13th power would equal the given number - for example 2 is the 13th root of 8192 because two to the thirteenth power is 8192.) I recently read a story of a young man who did just that in a little over one minute!
Here is the link.
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