Watch Wednesday, July 24, 2013 at 8pm | Embark with conservation ecologist Chris Morgan on a great challenge: to find and film the Siberian tiger.

Watch Wednesday, July 17, 2013 at 8pm | Documentary about Lonesome George, officially the loneliest animal on the planet until his death in June 2012.

Watch Wednesday, July 10, 2013 at 8pm | Follow a team of experts who build and test two accurate replicas of Egyptian royal chariots.

Watch Tuesday, July 16, 2013 at 10pm| Find out how the field of forensics, with few uniform standards and unproven science, can undermine the search for justice.

Watch Wednesday, July 3, 2013 at 9pm | Decipher genetic information that illuminates the origin of dogs — with implications for human culture.

Watch Wednesday, July 3, 2013 at 8pm | Revel in the resurgence of the bald eagle, the American emblem that's come roaring back from the brink of extinction.