a co-production of the NOVA/WGBH Science Unit and Vulcan Productions, Inc., a film by Kunhardt McGee Productions ; produced by Chana Gazit and Mary Robertson ; written by Chana Gazit and Daniel Gilbert ; directed by Chana Gazit
senior producers, Graham Judd, Lisa Mirowitz ; a co-production of the NOVA/WGBH Science Unit and Vulcan Productions, Inc. ; a film by Kunhardt McGee Productions ; produced by Sabin Streeter, Jack Youngelson, Tina Nguyen ; written by Jack Youngelson and Daniel Gilbert ; directed by Jack Youngelson