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Coral reefs around the world are vanishing at an unprecedented rate. A team of divers, photographers and scientists set out on a thrilling ocean adventure to discover why and to reveal the underwater mystery to the world.

Nature's dramas play out in one of the most remarkable ecosystems on Earth: Yellowstone.

Aerial Africa reveals the fascinating stories you'd never find if you weren't in the air.

The story of Qin Shi Huang is as epic in life as it is in death. Crowned as a boy king over 2,000 years ago, he grew to unify China for the first time, establishing a new form of government, uniform laws, and a single writing system that is still in use today. He also ordered the construction of a royal tomb that is larger than the Great Pyramid of Giza and is guarded by a massive army of terracotta warriors. Explore the transformative life and magnificent afterlife of China's first emperor.

A team of experts analyze the deaths of notable people while examining their lives.

In the far reaches of the North, wolf and bear come head to head. Winter has been long. The melting ice reveal scattered carcasses in the Swamp: a feast worth fighting for. The bears must fatten up before Winter comes again, the wolves must strengthen their pack. The Swamp has been their battleground for decades, who will rule the North?

In the heart of Africa, a new era is dawning. Rwanda is one of Africa's smallest nations and it's is heading towards an important milestone - it's about to receive its first resident lion pride in twenty-five years. Two and a half decades ago a brutal civil war ripped through the country, killing close to two million people and wiping out its most iconic wildlife. Even the great predators vanished from the landscape. The wilderness turned into farmland and the plains fell silent. Rwanda has worked hard to recover from the atrocities of war; it's regained its peace...and rejuvenated its wildlife. Today the wild plains are flourishing and great herds of antelope thrive once more. It's a garden of Eden for any herbivore, but there's still one thing missing...lions. Rwanda is eagerly anticipating their first lion reintroduction. Leaving their native home in South Africa, seven lions are making the arduous journey, covering thousands of miles to the heart of Africa. Their destination is Akagera, Rwanda's idyllic National Park. They are the last piece of the puzzle that will complete the rejuvenation of this land. For Rwanda, they symbolise the redemption of an entire nation - a country rebuilt and renewed. It's a long haul by road, but for the lions, this journey is only just beginning. To survive in this foreign land, the lions will have to master a barrage of challenges. The first will be to band together and form a pride. These lions are not bound by blood, they're a random collection of five females and two males, chosen for strong genes rather than family ties. In order to master their new kingdom, they will need to learn to hunt as a team and support each other. The key to the success of this reintroduction lies in a strong sisterhood of lionesses who will hunt and provide for the pride and the two young males, who will protect them and sire new generations of cubs to re-establish a healthy lion population in the Rwandan wilderness.

When a vicious fight with the Male leopard results in her cub's death, Malika must reinvent herself after the loss. In the battle to survive she faces dangerous enemies and must hunt way outside her comfort zone. Her desperation inspires ingenious new ambush techniques and each success slowly rebuilds her confidence till she has the courage to face her enemies and regain her former glory.

Every day, almost 200,000 people pass through Frankfurt Airport. Flying has become so routine, that most travelers never consider what a remarkable feat of human ingenuity it is. But that's about to change. X-Ray: Mega Airport takes you behind the scenes, from the tarmac to the terminal to the aircraft, revealing how everything in this intricately designed mini-city functions. Using state-of-the-art camera technology and computer imagery, we detail the engineering inside the planes, the machinery, and even the brains of the people who work here.

There is an island where dragons still roam. A Jurassic type underworld where ancient warlords still rule. Where they fight for supremacy...where they fight to survive. Komodo Island - deep in the remote basin of the Pacific Ocean - its an ancient Kingdom of fire and brimstone. Here, a string of 452 volcanoes erupt from the ocean bed, its known as "The Ring of Fire" and it's the perfect habitat for dragons. Komodo Dragons! The largest living lizard on the planet with 34 million years of survival in his DNA. Its no surprise that he's still known as a dragon, he has the presence of an ancient gladiator. He's armored in claws and scales, but instead of spitting fire, he spits deadly venom.

When it rains, it pours in Nxai Pan in northern Botswana. Lush plains scattered with vast herds of antelope stretch to the horizon. It is a veritable paradise. But Nxai Pan is a place of harsh contradictions. For when the rainy season is over, the lake dries up, leaving behind only cracked, desiccated salt pans as the desert, and its devastating heat returns. The biggest contradiction of all, then, is to call a place of such struggle "hell on earth" - because for some - this is still paradise. The lions of Nxai Pan have perfected the art of survival in some of the harshest conditions in Africa. A coalition of two mighty male lions rules this empire, their tenure spanning almost a decade. Their territory is vast, their females are loyal, and their hold on their land is ironclad. But they're getting old, and the looming dry season holds the promise of being one of the deadliest yet. Can these desert kings and their megapride dominate another dry season, or will this be their last?

From the spectacular shores of the Red Sea to the scorching heat of the Negev desert, Israel boasts a diverse array of natural landscapes. Explore the vast kaleidoscope of animal and plant life that populate its dramatic topography.

Portraits: where art, biography, history and identity collide. Kim Sajet (director of the National Portrait Gallery) chats with artists, historians, and thought leaders about the big and small ways in which portraits shape the world.

There's an alien world hidden just beneath our feet, where digging freaks tunnel in damp, claustrophobic blackness. Underground since the dawn of time, they've evolved quirky coping mechanisms, crafty weapons and disgusting habits. We unearth the creepy, the violent and the extraordinary, before we reveal the biggest digger of them all. Human flesh-eaters, Zombie hordes and Sand-Strikers uncovered at last. Come delve into Incredible Diggers!

It's the stuff of nightmares, a killer snake of immense size and strength, with a strike faster than the blink of an eye. She's 20-feet long. She has no hands, no arms, no legs, but she'll crush you to death in 15 minutes. She's an African rock python and she's queen of the constrictors - snakes that squeeze for a living. On the Savannah of South Africa, she goes about her daily business, but the details of her life are never observed. This is her story.

For extreme angler, Andy Coetzee, hunting down and landing the notorious Nile perch will quite possibly be the highlight of his fishing career.

It starts off talking about how animals adapted to become venomous and how they are still adapting and using their skills to this very day.

Documentary which follows a family of cheetahs on the plains of the southern Serengeti.

A caving expedition recently discovered a community of dwarf crocodiles living in the Abanda Caves, Gabon. The crocs are living in pitch darkness, hunt bats and some have bright-orange skin. Part of the original team returns to find out more about this bizarre phenomenon. It's mission impossible to access the crocs world and there's no way of knowing what they might find.

Megatron/Matrix is roughly the size of a billboard and holds 215 monitors displayed in an eight-channel video installation with custom electronics, bright colors, and sound, at the Smithsonian American Art Museum.

Marine biologist and doctoral student Amani Webber-Schultz rates 10 shark attacks in movies and TV shows, such as "Jaws," for realism.

STEM in 30 is an online science educational program for middle school students produced by the Smithsonian's National Air and Space Museum. Each episode features special guests and different science, math, engineering or technology topics.

For angling legend Andy Coetzee, coming face-to-face with a Giant Barracuda is still a blank box on his bucket list. He risks life and limb to feed his obsession and track down this terrifying fang-fish in the murky waters of Gabon.

Second beach at Port St Johns is a small, rocky cove on the rural coast of southern Africa, well known locally for its excellent surfing conditions. But now a dramatic story of death, witchcraft and mystery is playing out as marauding sharks kill and eat local surfers. It has been the scene of five horrific shark attacks, turning this peaceful stretch of beach into the African equivalent of Amity.