At a hair under five feet and barely 100 pounds, Wendy Rodriguez doesn't look too dangerous. She works as a therapist, providing care for developmentally challenged infants. But she has another life, as well. She's a five-time world champion boxer. L.A. Times columnist Steve Lopez brings us the story of this flyweight powerhouse, who's changing young lives, opinions about women in boxing, and pulling no punches in either venue.