Gilbert, Daniel Todd., host.

Sweet, Jesse.

Gazit, Chana.

Youngelson, Jack.

WGBH (Television station : Boston, Mass.). Science Unit.

Vulcan Productions.

Public Broadcasting Service (U.S.)

produced by Jesse Sweet, Sabin Streeter, Alexis Bloom ; written by Jesse Sweet and Daniel Gilbert

produced by Chana Gazit and Mary Robertson ; directed by Chana Gazit ; written by Chana Gazit and Daniel Gilbert

produced by Sabin Streeter, Jack Youngelson, Tina Nguyen ; directed by Jack Youngelson ; written by Jack Youngelson and Daniel Gilbert

a co-production of the NOVA/WGBH Science Unit and Vulcan Productions, Inc. ; a film by Kunhardt McGee Productions.

Gilbert, Daniel Todd.

Sweet, Jesse.

Streeter, Sabin.

Bloom, Alexis.

Gazit, Chana.

Robertson, Mary (Television producer)

Youngelson, Jack.

Nguyen, Tina (Film producer)

Judd, Graham.

Mirowitz, Lisa.

Bacon, Michael, 1948-

WGBH (Television station : Boston, Mass.). Science Unit.

Vulcan Productions.

Kunhardt McGee Productions.

WGBH Educational Foundation.

Public Broadcasting Service (U.S.)

PBS Distribution (Firm)

produced by Jesse Sweet, Sabin Streeter and Alexis Bloom ; written by Jesse Sweet and Daniel Gilbert

produced by Chana Gazit and Mary Robertson ; written by Chana Gazit and Daniel Gilbert ; directed by Chana Gazit

produced by Sabin Streeter, Jack Youngelson, Tina Nguyen ; written by Jack Youngelson and Daniel Gilbert ; directed by Jack Youngelson

senior producers, Graham Judd, Lisa Mirowitz ; a co-production of the NOVA/WGBH Science Unit and Vulcan Productions, Inc. ; a film by Kunhardt McGee Productions.