written, produced and directed by Linda Garmon ; a Nova production by the WGBH/Boston Science Unit in association with BBC-TV, NDR International Hamburg and Nederlandse Omroepprogramma Stichting
produced by Jezza Neumann, Lauren Mucciolo ; directed by Jezza Neumann ; a True Vision production for WGBH/Frontline in association with BBC Television ; WGBH Educational Foundation