How to Turn Your Notebook Into a “Mental Swiss-Army Knife”

Here’s an interesting topic on Ask MetaFilter: I have a graph-ruled Moleskine that is begging to be turned into a compendium of obscure, fascinating, and perhaps occasionally useful reference material. Some of the things I want to put in there are Rubik’s Cube algorithms, keys to reading non-Latin alphabets, some simple math formulas (Trachtenberg math, [...]