Mary looks down almost sulkily at this. She knows it ought to only make her more determined, and ordinarily it would -- but the language that people use without words, their expressions and countenance and tones, is more difficult by far than Spanish or Chinese.

"I can read their symptoms," she mutters. "There is a lexicon for that. But it does not work with personalities."

A smile might mean anything, depending on the person; a frown, the same. It is all too confusing.