Featured on PDR in the essay Handy Mnemonics: The Five-Fingered Memory Machine

Before humans stored memories as zeroes and ones, we turned to digital devices of another kind — preserving knowledge on the surface of fingers and palms. Kensy Cooperrider leads us through a millennium of “hand mnemonics” and the variety of techniques practised by Buddhist monks, Latin linguists, and Renaissance musicians for remembering what might otherwise elude the mind.