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A couple of evenings ago, my wife was reading an article about a federal prosecutor, when she suddenly exclaimed "How many digits of π do you know? Because this lawyer knows 500 digits." I had to admit that I'd only memorized π to eight decimal places, 3.14159265, but I immediately jumped in with "I know how to write a program that can print out thousands of digits of π." So she threw down the gauntlet.