by Paul Devlin ; directed, edited, and produced by Paul Devlin ; produced by Claire Missanelli ; a Paul Devlin production in association with BBC, YLE/FST Finland, Discovery Channel Canada, SVT/Sweden
a Quest Productions and Kikim Media production for Nova ; in association with the Catticus Corporation ; WGBH Educational Foundation ; senior series producer, Melanie Wallace ; produced and directed by Michael Schwarz and Bill Jersey