Before desktop computers were widely used in China, telegraph operators there had to memorize every Chinese character's GB 2312 character code.
Moleskin is made from cotton, not moles. (In other news, guacamole is made from avacados.)
Garbage collection in Erlang is per-process. This seems weird—are messages copied from process to process?—but as that article explains, there are advantages, too.
The Haskell standard library contains over 100 operators— that is, functions whose names consist of ASCII symbols, like
@=?. Someone must stop these madmen.
I learned a few very basic odds and ends of category theory.
The book I'm reading (by Benjamin Pierce) offers “injective functions are monic in Set; surjective functions are epic” as a mnemonic, you know, to help you remember monic and epic. This has to be the worst mnemonic of all time. I just don't see anything helpful about it. Sur- means “under”. Epi- mean “on top of”. I can never remember the difference between injective and surjective to begin with.