PBS ; produced and directed by Riva Freifeld ; written by Ken Chowder ; co-produced by Amy Brown ; a Riva Productions film for American Experience ; WGBH Boston
an Insignia Films production for American Experience ; WGBH Educational Foundation ; written by Michelle Ferrari ; produced by Amanda Pollak ; directed by Stephen Ives
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