Walter Pauk created the note-taking system devised in what decade?
Cornell Notes The Cornell Notes system (also Cornell note-taking system or Cornell method) is a note-taking system devised in the 1950s by Walter Pauk, an education professor at Cornell University. Pauk advocated its use in his best-selling book "How to Study in College".
Polybius square In cryptography, the Polybius square, also known as the Polybius checkerboard, is a device invented by the Ancient Greek historian and scholar Polybius, for fractionating plaintext characters so that they can be represented by a smaller set of symbols.