Strachan, Anna Lee, television director, television producer.

Bicks, Michael, television director, television producer, screenwriters.

Yost, Peter, television director, television producer, screenwriters.

Teeling, Jane, television director, television producer.

Bertelsen, Phil, television director, television producer, screenwriters.

Klein, Larry (Producer), television director, television producer, screenwriters.

Wolfinger, Kirk, television director, television producer.

Palmquist, Owen, television director, television producer, screenwriters.

WGBH (Television station : Boston, Mass.), broadcaster.

PBS Distribution (Firm) publisher.

directed by Anna Lee Strachan ; written by Michael Bicks ; produced by Michael Bicks & Anna Lee Strachan ; written, produced & directed by Peter Yost ; produced and directed by Jane Teeling and Phil Bertelsen ; written by Phil Bertelsen -- directed by Anna Lee Strachan ; written by Michael Bicks ; produced by Michael Bicks & Anna Lee Strachan ; written, produced & directed by Larry Klein ; produced and directed by Kirk Wolfinger, Owen Palmquist ; written by Owen Palmquist.

a NOVA production for WGBH Boston.

Bicks, Michael, screenwriter, television producer, television director.

Strachan, Anna Lee, screenwriter, television producer, television director.

Pogue, David, 1963- host.

Santos, Laurie, on-screen participant.

WGBH (Television station : Boston, Mass.), production company.

Public Broadcasting Service (U.S.) publisher, broadcaster.

PBS Distribution (Firm) film distributor.

produced for WGBH/Boston ; written, produced and directed by Michael Bicks & Anna Lee Strachan.

Bicks, Michael, screenwriter, television director, television producer.

Strachan, Anna Lee, screenwriter, television director, television producer.

Mateen, Khari, composer.

Little Bay Pictures, LLC, production company.

American Experience Films, production company.

Public Broadcasting Service (U.S.), publisher.

PBS Distribution (Firm), film distributor.

Little Bay Pictures, LLC for American experience ; American Experience Films ; written, produced and directed by Michael Bicks & Anna Lee Strachan.

Bicks, Michael, film director, film producer, screenwriter.

Strachan, Anna Lee, film director, film producer, screenwriter.

Alvarado, David (David Anthony), film director, film producer.

Sussberg, Jason, film director, film producer, screenwriter.

Berlin, Heather, host.

PBS Distribution (Firm), publisher.

produced and directed by Michael Bicks and Anna Lee Strachan, David Alvarado and Jason Sussberg ; written by Michael Bicks, Anna Lee Strachan, Jason Sussberg.

Greene, Brian, 1963-

McMaster, Joseph.

Sahula, Jonathan.

Cort, Julia.

Bartlett, Dick, 1942-

Judd, Graham.

Streeter, Sabin.

Audette, Steve.

MacLowry, Randall.

Rosen, Josh.

DeNooyer, Rushmore.

Elisco, David

Quade, Doug.

Strachan, Anna Lee.

Greene, Brian, 1963- Elegant universe.

Greene, Brian, 1963- Fabric of the cosmos.

PBS Distribution (Firm)

WGBH (Television station : Boston, Mass.)

Channel Four (Great Britain)

David Hickman Films (Firm)

Sveriges television.

Norddeutscher Rundfunk.

WGBH Educational Foundation.

ARTE France.

National Geographic Channel (Television station : Washington, D.C.)

Bicks, Michael, screenwriter, television director, television producer.

Strachan, Anna Lee, screenwriter, television director, television producer.

Tinworth, Rob, editor of moving image work.

Longo, Jason, director of photography.

Cort, Julia, television producer.

Schmidt, Chris, television producer.

David, Keith, narrator.

Pinker, Steven, 1954- commentator.

Wrangham, Richard W., 1948- commentator.

Morris, Ian, 1960- commentator.

Mendoza, Rubén G., 1956- commentator.

Mateen, Khari, composer (expression)

Little Bay Pictures, LLC, production company.

Public Broadcasting Service (U.S.), publisher, broadcaster.

PBS Distribution (Firm), film distributor.

a Nova production by Little Bay Pictures, LLC for WGBH Boston ; written, produced and directed by Michael Bicks & Anna Lee Strachan.

Sahula, Jonathan, television producer.

McMaster, Joseph, television producer, screenwriter.

Wallace, Melanie (Producer)

Swartz, Howard B., television producer.

Aspell, Paula S., television producer.

Judd, Graham, television producer, television director, screenwriter.

Streeter, Sabin, television producer, television director, screenwriter.

MacLowry, Randall, television producer, television director, screenwriter.

Cort, Julia, television producer, television director, screenwriter.

Rosen, Josh, television producer, television director, screenwriter.

DeNooyer, Rushmore, television producer, television director, screenwriter.

Elisco, David screenwriter.

Quade, Doug, television producer, film editor.

Strachan, Anna Lee, television producer.

Greene, Brian, 1963- host.

Audette, Steve, film editor.

Humphreys, Robert, director of photography.

McCarthy, Stephen (Cinematographer)

Tomney, Ed, composer (expression)

Greene, Brian, 1963- Fabric of the cosmos.

32-12 Media (Firm), production company.

Film Posse (Firm), production company.

Spine Films, production company.

Lone Wolf Documentary Group, production company.

ARTE France production company.

National Geographic Channel (Television station : Washington, D.C.), production company.

WGBH Educational Foundation, production company.

PBS Home Video film distributor.

produced and directed by Graham Judd and Sabin Streeter ; telescript by Graham Judd & Sabin Streeter ; story by Joseph McMaster and Graham Judd & Sabin Streeter produced and directed by Randall MacLowry ; telescript by Randall MacLowry ; story by Joseph McMaster and Randall MacLowry produced and directed by Julia Cort and Josh Rosen ; telescript by Julia Cort and Josh Rosen ; story by Joseph McMaster and Josh Rosen (ca. 55 min.) -- produced and directed by Rushmore DeNooyer ; telescript by Rushmore DeNooyer ; story by Joseph McMaster and David Elisco and Rushmore DeNooyer ; produced by Doug Quade ; produced by Anna Lee Strachan (ca. 56 min.)

senior producer, Jonathan Shula ; series executive producer, Joseph McMaster ; senior series producer, Melanie Wallace ; executive producer, Howard Swartz ; senior executive producer, Paula S. Apsell ; a NOVA Production by 32-12 Media (program 1), Film Posse (program 2), Spine Films (program 3), Lone Wolf Documentary Group (program 4) ; in association with ARTE France and National Geographic Channel ; WGBH Educational Foundation.