written and directed by Andreas Ewels, Norbert Porta ; production ZDF, Alexandre Kegler, Sigrid Beck ; produced by Norbert Porta Sciencedocu on behalf of ZDF
a Frontline production with Kirk Documentary Group ; directed by Michael Kirk ; written by Michael Kirk & Mike Wiser ; produced by Michael Kirk, Mike Wiser, Philip Bennett ; produced and reported by Jim Gilmore, Gabrielle Schonder
produced by Michael Kirk, Mike Wiser ; produced & reported by Jim Gilmore, Gabrielle Schonder ; directed by Michael Kirk ; a Frontline production with the Kirk Documentary Group
directed by Michael Kirk ; narrated by Will Lyman ; produced by Vanessa Fica, Mike Wiser, Michael Kirk, WGBH Educational Foundation, Kirk Documentary Group