Grizzly Empire

The Serengeti is one of the most brutal environments on the planet. It's also home to the tough Vumbi lion pride. Using ground-breaking new tools (including a lion-proof peeping Tom robot), National Geographic explorers Michael "Nick" Nichols and Nathan Williamson embed with the lions to reveal a never-before-seen view into a world with razor thin margins between life and death.

Around 800 BC, Kush, a little-known subject state of Egypt, rose up and conquered the Egyptians, enthroned its own Pharaohs, and ruled over the empire of King Tut for nearly 100 years. This unlikely chapter of history has been buried by the Egyptians and belittled by early archaeologists, who refused to believe that dark skinned Africans could have risen so high. But now, in the heart of Sudan, archeologists Geoff Emberling and Tim Kendall are bringing the truth about the Black Pharaohs to life.

America's Greatest Animals takes us across North America on a revelatory mission: which of the continent's landmark creatures deserve to make the list?

Five lion prides in Africa compete for scare food and each have adopted their own style of hunting. Follow them as they take down everything from buffalo to giraffes. Only the most cunning and capable will survive.

“The American President” is a series that aired on PBS in 2000 profiling 41 U.S. chief executives, using exclusive interviews with Presidents Clinton, Bush, Ford, and Carter. Well known figures lend their voice to presidents of the past who lived before sound recordings, including: Colin Powell, Bob Dole, Walter Cronkite, Ben Bradlee, John Glenn, James Carville, Andrew Young, and the Rev. Billy Graham. Narrated by Hugh Sidey.

After filming one of the most unusual attacks ever seen in the African savannah - four cheetahs being brutally attacked by two male lions - filmmaker Reinhard "Leo" Kuenkel joins forces with world-renowned lion expert Craig Packer to decipher what happened during this incredible take down, and more importantly, why it happened in the first place. They go frame by frame though the footage of the fight to break the details of the attack, and place them in the context of what they know about the way these animals act. Along the way, Kuenkel and Packer make some stunning revelations about the dark relationship between lions and cheetahs, and perhaps finally explain one of the last great African wildlife mysteries.

On a summer's night, there's nothing more magic than watching the soft glow of fireflies switching on and off. Few other life forms on land can light up the night, but in the dark depths of the oceans, it's a different story: nearly 90% of all species shine from within. Whether it's to scare off predators, fish for prey, or lure a mate, the language of light is everywhere in the ocean depths, and scientists are finally starting to decode it.

National Geographic's landmark event series, The Greeks, brings together historians, archaeologists, actors, athletes, scientists and artists to launch a groundbreaking exploration into the ancient Greeks' journey - not just to better understand their past, but to discover how their legacy illuminates our present, and will shape our future. The story of the Greeks is the story of us.

The tornado that struck El Reno, Oklahoma, on May 31, 2013, defined superlatives. It was the largest twister ever recorded on Earth.

The saltwater crocodile , the largest reptile there dominates the rivers and estuaries of northern Australia . It is an example of adaptability and strength, success and longevity. Year after year adapting to their harsh environment and he faces every challenge reaffirming his reign in its territory.

Undiscovered Haiti follows José Andrés into the heart of this mysterious country; through its unique cuisine we discover the history and culture - and see into the future - of a proud and rarely understood people.

What animals do when they think no one is watching.

Wild animals kill people every day - but the most dangerous creatures aren't always what you think. From tigers to mosquitos, animals can kill in a multitude of ways.