From: National Geographic Channel on Sat, May 07 2011 6:58 PM

From a warlord’s coffers, to the prestigious diamond market. Just how far are we willing to go to possess these remarkable jewels?

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Having evolved a range of amazing natural weapons to survive, bears now face climate change and the dominance of man.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Having evolved a range of amazing natural weapons to survive, bears now face climate change and the dominance of man.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Joseph Mengele spent years doing bizarre medical experiments on twins at Auschwitz...but did his research end there?

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Explorer looks at the science of solitary and discovers what it means to be absolutely alone.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Death Row talks to inmates approaching execution in Huntsville, TX, as well as loved ones and players in the act of execution.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

John & McKenzie Garcia take a road trip to help their favorite foster dog, Little Girl, begin life in a new home.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

The fatal conflict at Kent State brought the chaos of the Vietnam War to American soil.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

If you’re looking for inspiration for your next fishing trip, you've come to the right place.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

If you’re looking for inspiration for your next fishing trip, you've come to the right place.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

The Fight Science team invites SWAT officers to the lab to put police techniques and equipment through the ultimate stress test.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Wendy undergoes cognitive therapy to understand her fear of heights. Then she faces her ultimate nightmare, being hoisted up 40 stories onto construction scaffolding.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Wendy undergoes cognitive therapy to understand her fear of heights. Then she faces her ultimate nightmare, being hoisted up 40 stories onto construction scaffolding.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Ah, summer. A time for catching fireflies and pop-fly baseballs. Grab a lemonade and learn how it all works.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Harrowing firsthand accounts from combat veterans provide a fresh, personal look at the first major battle of the Vietnam War.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

The Fight Science team puts an elite breed of special operations forces to the test.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Follow the journey of four of the most challenging pit bulls found on Michael Vicks property as DogTown helps rehabilitate them.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Explorer, the longest-running documentary series on cable, marks it 25th anniversary with a two-hour special hosted by Lisa Ling.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Understanding the behavior of hammerhead sharks may be the key to ensuring their survival.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Riley joins a crew lifting a 50 ton boiler 160 feet up a tower and suspending it above 24,000 mirrors to create solar power.