Proof that 22/7 exceeds π

http://en.wikipedia.org/wiki/Proof_that_22/7_exceeds_%CF%80

22/7 - π

http://www.wolframalpha.com/input/?i=22%2F7+-+%CF%80+

π - 223/71

http://www.wolframalpha.com/input/?i=+%CF%80+-+223%2F71

A history of π

http://www-history.mcs.st-and.ac.uk/HistTopics/Pi_through_the_ages.html

Feynman point

http://www.wolframalpha.com/input/?i=+Feynman+point

http://en.wikipedia.org/wiki/Feynman_point