In this bonus episode we bring you a story from 'Constant Wonder,' our sister show that explores nature's hidden marvels, forgotten heroes of history, and life stories that both humble and inspire. He walked the streets in secret, a veterinarian in his off-hours, looking to help the pets of the homeless. Now his work is the subject of the tv show "Street Vet." He describes how his work has changed the lives of both pets and their owners. And his own. Guest: Kwane Stewart, veterinarian and co-founder of Project Street Vet