"Never." But she gave Brian a weak smile as she moved to pull her textbook out. With anyone else, she would have dropped it on the table with a thump, but since it was Brian, she wiped it down with the antiseptic wipes she kept around, and then opened it to the chapter in question.
"Okay, here goes," she said. "It's...identification, mostly." It shouldn't be as hard as she found it.