And random stuff can be useful educational aids. See also: The entire "
Manga Guide to..." franchise. (Though, frankly, I find the educational bits to be shoehorned in... particularly the Databases and Microprocessors ones.) And a huge chunk of what I can recall about fermentation is from Moyashimon.
“I remember the circulatory system by singing Nickelback-- This is how, I remind me of blood cells and their jobs: Lymphocytes, and T-Cells, crushing cancer on every level."