School’s back in session, and every day, 30 million kids head to the cafeteria to chow down. On this episode of Bite, Tom returns to the lunchroom at his elementary school alma mater and finds that the grey mystery meat he remembers has been replaced by tasty, fresh offerings that are free to every student. And he catches up with Jennifer Gaddis, author of the book The Labor of Lunch, who explains the economic forces that figure into school food, from “lunch shaming” to fair wages for cafeteria workers.