It's Always Sunny in Philadelphia : What/Why was Dee reading?

That's the real question.

She was studying up on Parkinson's disease because she has a 43% chance of getting it during her life. It's why she picked up smoking because it has shown to reduce the chances of Parkinson's.

^ Yeah. I guess the OP must have zoned out during part of the episode. Bozo move.

The eagle never lost so much time as when he submitted to learn from the crow.