I occasionally "hide" bills in selected sections of textbooks I've been meaning to read. It serves as a perk or secondary means of positive reinforcement (the p

I occasionally "hide" bills in selected sections of textbooks I've been meaning to read. It serves as a perk or secondary means of positive reinforcement (the primary being learning interesting/useful stuff). It also indirectly brings the material near where I've stuffed the bill to the forefront of my mind, even if I'm not incentivizing myself with cash. "Where was that $20? Oh, near Djikstra's algorithm. I'd been meaning to look that over."