Wearing my cherry-pie tie to continue celebrating Pi Day on 14 March (3-14). I'm sure I learned about π as the ratio of a circle's circumference to its diameter by fourth grade but I did not grasp its significance as a fundamental universal constant until studying trigonometry and calculus in high school, and then later in complex variables and quantum mechanics in college. You can find links to the first billion, and hundred billion, digits of π at MIT's Web site. I'm happy to remember seven, 3.14159.
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