PBS ; a production of KERA ; produced in association with Once TV-Mexico City ; produced by Andrea Boardman, Ginny Martin, Rob Tranchin ; written by Rob Tranchin ; directed by Ginny Martin
a NOVA production in association with Night Fire Films and ARTE France ; written and directed by David Lebrun ; produced for Nova and narration by Sarah Holt ; produced by Rosey Guthrie and David Lebrun ; edited by Nathan Hendrie, David Lebrun, and Eric Marin