Code breaking is so cool. Above is a short Prezi on Kryptos in Washington, DC. Below is an activity that allows students to encrypt, and decode, their own secret messages using Algebra.
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[...] cicada life cycles, spirals, knots and Murphy’s Law (doh!), fractals as used in animation, Cryptography, magic squares, slide rules, imaginary numbers, Möbius strips, Zero, monkeys typing on keyboards, [...]