produced by David Dugan ; directed by Lucy Haken ; producer, Caitlin Saks ; a NOVA production by Windfall Films (part of the Argonon Group) for WGBH Boston
produced by Raw TV Ltd. for Discovery Communications, Europe Limited and PBS ; series producer, Ed Wardle ; location series producer, Jamie Berry ; consulting producer, Tim Jarvis ; producer/director, Joe French ; executive producer, Kathryn Taylor