a Nova/WGBH production ; produced by Matthew Barrett, John Rubin, and Sarah Holt ; written by John Rubin ; directed by John Rubin, Rushmore Denooyer, Serena Davies, and Sarah Holt
written, produced, & directed by Iain Riddick ; produced by Ruth Roberts ; produced by Darlow Smithson Productions Ltd, Shock of Mighty Productions and Handel Productions (EFS) Inc. in association with NOVA/WGBH Educational Foundation and Discovery Channel Canada ; WGBH
produced by Tangled Bank Studios in association with Holt Productions and Smithsonian Networks ; producer/director, Sarah Holt ; writers, Thomas Friedman, Sarah Holt