> A corollary to this is, when reading books, mark them up! Not library books though. Every so often I get one with stuff underlined with pen or highlighter,

> A corollary to this is, when reading books, mark them up! Not library books though. Every so often I get one with stuff underlined with pen or highlighter, and it's one of things that really makes me angry. (Lightly in pencil I'm okay with.)