You all know Pi, right?  The circumference of a circle divided by its diameter?  The answer is the same for any circle – a math constant, usually rounded to 3.14159. Did you know that a guy named Chao Lu recited 67,890 decimal places of pi?  It took him 24 hours and 4 minutes (with no break).  He’s the current official record holder.  He had actually spent a year memorizing 100,000 digits, but messed up when he got to the 67,891st number.  Damn.  I should send him one of our cool hats.