Rock climber Dean Potter has become one of the most innovative and successful climbers of his generation. Follow him as he tackles some astounding feats on sheer rock faces.

From the creators of critically acclaimed Inside 9/11 comes another powerful journalistic account, Inside Hurricane Katrina. Go beyond the round-the-clock news coverage for a comprehensive look behind the devastation caused by nature's fury and human error. How did this happen? Can it happen again? Why weren't emergency personnel fully ready to respond to a real disaster? Using comprehensive analysis of events, hours of government audio tapes, and personal interviews, National Geographic takes viewers into the eye of Katrina to uncover the decisions and circumstances that determined the fate of the Gulf residents.

On March 16, 1966, Neil Armstrong and David Scott launch into space aboard the Gemini 8 capsule. The mission is to rendezvous and dock with the Agena space module , a critical step in reaching the moon.

Gemini 8 successfully docked with Gemini Agena target vehicle GATV-6 hours 34 min after liftoff. Because of problems with the spacecraft control system, the crew was forced to undock after approximately 30 min.

The spacecraft-target vehicle combination had begun to encounter increasing yaw and roll rates. The crew regained control of their spacecraft by using the reentry control system, which prompted an early landing in a secondary landing area in the Pacific. No EVA was performed.

The failure was caused by an electrical short in control system. Docking and re-rendezvous secondary objectives were not achieved due to the shortened mission.

Every year, hundreds of people are killed by elephants and the number of casualties keeps rising. We travel to India to find out why elephants, the world's favorite circus act, are becoming such a deadly problem.

They are some of the biggest pyramids on the planet, millions of tons of stone and earth towering above the landscape in a display of massive wealth and power. But it wasn't the pharaohs that built these pyramids. This is the majestic ancient city of Teotihuacán, Mexico, home to one of the most powerful civilizations of its time.

But why, around 750 AD, did the advanced civilization that created Teotihuacán suddenly vanish? The identities of its founders, the language they spoke and even the original name of the city are all unknown. DNA analysis of bodies from Teotihuacán shows they weren't Mayan, Incan or Aztec, but an entirely different civilization.

It was assumed to have been a peaceful, utopian society, but the latest discoveries are revealing a much darker scenario. In the depths of Teotihuacán's pyramids, experts have uncovered vault after vault filled with curious human remains.

Through historical recreations and spectacular CGI, Pyramids of Death brings the world of these ancient people to life, from their remarkable feats of construction and engineering to their grisly methods of human sacrifice. Follow the investigation step by step and unravel the mysteries surrounding the rise and fall of one of the ancient world's most powerful and least understood civilizations.

From the alleged sighting in 1947 to the incident at Roswell, N.M., military personnel, scientists and ordinary citizens give extraordinary accounts of encounters with the unexplained.

In life, the creature probably resembled a chimpanzee more than anything else. It moved through a lakeside landscape of grasslands and forest searching for food, accompanied by small bands of its fellows, most likely, and keeping a sharp eye out for pythons, crocodiles and saber-toothed cats. This animal probably shared the forest with apes and monkeys and, like them, spent some time up in the trees. It may have walked upright, which apes rarely do for very long at a stretch. But at a casual glance, it would have seemed to our eyes like just another chimp.

In death, however, this creature has just sent shock waves through the world of science. After eight grueling years of hunting in the hot, wind-scoured desert of central Africa, an international team of researchers has uncovered one of the most sensational fossil finds in living memory: the well-preserved skull of a chimp-size animal, probably a male, that doesn't fit any known species. According to paleontologist Michel Brunet of the University of Poitiers in France, whose team reported the find in Nature last week, there is no way it could have been an ape of any kind. It was almost certainly a hominid — a member of a subdivision of the primate family whose only living representative is modern man. And it has left scientists gasping with astonishment for several reasons.

To start with, it is nearly 7 million years old — a million years more ancient than the previous record holder. Indeed, this new species is as much older than the famous Lucy as Lucy is older than we are. It almost certainly dates from very near that crucial moment in prehistory when hominids began to tread an evolutionary path that diverged from that of chimps, our closest living relatives. Even more surprising, this ancient hominid was not discovered anywhere near the Great Rift Valley of East Africa, where all the record setters of the past three decades have been found. Instead, it turned up in the sub-Saharan Sahel region of Chad, more than 1,500 miles to the west, forcing a rethinking of the conventional wisdom about where humans arose.

Dino Autopsy is a discovery that promises to transform what scientists believe about the dinosaur … a virtually intact dino mummy. Nearly everything we know of dinosaurs comes from bones and teeth, usually the only tissue durable enough to fossilize. The conditions that preserved this extraordinary mummy were one in a million, and early examination offers never-before-seen details of what they really looked like, as well as clues to how they moved and lived. The paleontologists involved already believe that this could prove to be one of the most important dinosaur discoveries of all time.

The recently discovered partially intact dino mummy, named Dakota, is one of the most important dinosaur discoveries in recent times calling into question our conception of dinosaurs’ body shape, skin preservation and movement.

Fossilised skin and tendons have allowed us to reconstruct major muscle sizes, with many body parts offering a tantalising glimpse of a 3-D dinosaur.

The scan of the 3,600kg body was of the one of the largest CT scans ever undertaken!

In Dino Death Trap head deep into China's Junggar Basin where palaeontologists have uncovered the remains of dinosaurs previously unknown to science in a discovery which could reveal the secrets of dinosaur evolution. While in Dino Autopsy we get under the skin of a dinosaur with exclusive access to the excavation of one of the most intact dinosaur mummies ever found.

In Dino Death Trap, an extraordinary dinosaur find follows a team of palaeontologists in western China as they unearth a virtual black hole in dinosaur evolution. Led by Dr James Clark of George Washington University and Dr Xu Xing of the Chinese Academy of Sciences, the team uncovers hundreds of exceptionally preserved dinosaur fossils, including new species that were astonishingly found stacked on top of one another in pits of death in the dry and desolate Junggar Basin. Preserved for 160 million years, a total of 400 specimens and around 40 different species, including bizarre ancestors of the T-Rex and the triceratops and an ancient crocodilian, were discovered in the pits. The scientists believe they may even have found the elusive ‘missing link’ in the middle Jurassic, when dinosaur evolution went wild. Watch in awe as the amazing creatures are digitally brought back to life and we probe the mystery of how these dinosaurs lived and died.