Things to know about Stephen Ritz, one of NPR's 50 Great Teachers:
He and his students made bow ties out of Scrabble tiles.
His Bronx classroom, a refurbished school library, has more plants than desks.
He calls the room his National Health, Wellness and Learning Center. It's got tower gardens, gleaming cabinets and counters, an industrial sink and a new, mobile cooking station.
"In this class, we go from seed to tower to table to plate in 20 feet," Ritz says.