While studying for the Private Pilot Knowledge (Written) Test, I had a hard time memorizing the rules governing the minimum requirements for VFR in the difference airspaces. A fellow student pilot found this sketch by R. Tyler Croy. I really like how it distilled the rules into something small...

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Thought it might be neat to combine elementary school cryptography with popular social messaging services. I made a simple one-time pad generator available here. The source code is on github.

one-time pad site

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