co-produced and edited by Jedd Ehrmann ; written, produced and directed by Terri Randall ; a Nova production by Terri Randall Productions for WGBH Boston
a Crossing the Line and HHMI Tangled Bank Studios production for PBS ; in co-production with ZDF in cooperation with ARTE, BBC and RTÉ ; written & directed by Emer Reynolds ; produced by John Murray & Clare Stronge