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Happy Pi Day! The mathematical sign of pi represents the infinite, non-repeating number that is the ratio of a circumference of a circle to its diameter, commonly shortened to 3.14159. Check out our exhibition “Mathematics: Vintage and Modern” for the math behind Rubik’s cubes, Klein bottles, and knots, among much, much more. It’s on view post-security in Terminal 2 and online at https://bit.ly/MathAtSFO
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#Onthiday in 1958, Pan American World Airways received their first Boeing 707.
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This frequent flyer miles card is from the 1980s.
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