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
a Nova production by Lone Wolf Documentary Group for WGBH/Boston ; produced by Kirk Wolfinger and Donna Huttemann ; written, produced, and directed by Rushmore Denooyer