From: National Geographic Channel on Sat, May 07 2011 7:00 PM

Explorer tells the story of a moment that changed the world forever: the dropping of the atomic bomb on August 6, 1945.

From: National Geographic Channel on Sat, May 07 2011 7:00 PM

Street dogs rescued from Ethiopia come to DogTown for a shot at domestic life and a golden with a mangled paw gets some help.

From: National Geographic Channel on Sat, May 07 2011 7:00 PM

Street dogs rescued from Ethiopia come to DogTown for a shot at domestic life and a golden with a mangled paw gets some help.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

A collie mix is taught to ignore his aggressive instincts after killing other animals, and a trainer rescues an emaciated stray.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

All of us have occasional sleepless nights, but for people with fatal familial insomnia, it’s the beginning of the end.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

Officers raid a house run by suspected human smugglers and uncover a secret tunnel below city streets.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

Officer Hector Navarro stops a silver pickup truck at the Nogales port of entry — and ends up breaking a drug bust record.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

Trainers take on the shyest dog they’ve ever seen and a hyperactive shepard mix, as Dr. Mike performs grueling 8-hour surgery.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

Pilot John Manheimer and his team patrol the Sonoran Desert searching for illegal border crossers and drug smugglers.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

DogTown works overtime to heal a terrier mix suffering from a mystery illness and then preps rescued Beagles for adoption.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

Robots are being developed to probe the icy waters on Europa. But would they survive the extreme cold and searing radiation?

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

The newly overhauled U.S.S. Eisenhower is set to deploy for the first time in four years, but her crew must prove its mettle.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

While Dr. Mike struggles with difficult surgery on a Labrador, DogTown welcomes rescued breeding dogs from an LA puppy mill.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

Riley heads to Portland, Ore, where a fault in the John Day Dam is stopping cargo traffic in its tracks.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

Outwardly a white power group, this violent prison gang’s real interest is in controlling drug and extortion rackets.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

From eating light bulbs to exorcising demons, some will go to extreme measures to heal - and be healed.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

Music star Emmylou Harris calls for help with a vicious shepherd mix named Gunnar. Can DogTown help?

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

Riley joins a team on the 800-mile Trans-Alaska oil pipeline - the conduit for almost 15 percent of America?s oil production.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

Explorer investigates the science behind the terrifying dangers of a high-altitude electromagnetic pulse, or HEMP.

From: National Geographic Channel on Sat, May 07 2011 6:59 PM

Touching the dead, to many, is taboo. But what if it was your job? Meet the people who handle our remains.