She was walking down the sidewalk, talking to the friend beside her, pushing the kid and stroller ahead of her.

Where she was walking was close to a university, USF, and not too far from a medical center/medical school, UCSF.

She was talking in the warm, fond, frustrated tone that would fit talking about someone you liked a lot who kept being difficult.

She said, "It's only a correlation, but. . ."