Dernocua is my notebook from 02021 CE, the second year of the covid pandemic. It’s the sequel to Dercuano and Derctuo . It contains about 410000 words, about 1100 pages, in 267 notes on various different topics: programming, machining, electronics, digital fabrication, math, physics, economics, history, and so on…
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It’s typically 10 μm thick and 400 mm wide, giving it an aspect ratio of 40000 in that dimension, and rolls are commonly some ten meters in length, for an aspect ratio of 1 000 000; heavy-duty versions can reach 30 μm or more. Despite their thinness, foils of 25 μm or more are impermeable to oxygen, water, and light…