At the height of its power between the 9th and 15th centuries, Angkor was a resplendent city, considered the most extensive urban complex of the pre-industrial world. But by the late 16th century, the empire was in its death throes.
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Manuel Calderon de la Barca Sanchez examines the nature of forces and matter in the universe.
Between a jagged cliff face and a roaring ocean, lives a colony of Australian Sea Lions. In an environment equally harsh and beautiful, be immersed in a classic tale guided by one of Australia's unique, intelligent, and playful animals.
Animals travel more than 500 miles across the Serengeti plains in Tanzania and Kenya.
The snakes that live in the desert are highly adaptable, putting Nigel's skills to the test.
Mexico is home to an incredible 400 snake species, nearly a fifth of which are venomous.
Nigel seeks out deadly snakes from the wetlands of the Rio Grande to the Amazon rainforest.
Examining the most poisonous and deadly snakes in the archipelago of the Philippines.
Jump in the flow of the East Australian Current with migrating humpback whales.
SETI searches for intelligent life in the universe; top candidates to host life beyond Earth.
Robots; Robonaut; the Space Exploration Vehicle; the ATHLETE rover.
What it takes to be an astronaut; the Neutral Buoyancy Laboratory; space suits.
Mars; Curiosity rover; Mars Desert Research Station.
A look at China's immense historical records, which include data about warfare, traditions and more.
A look at the Dark Age's pagan Vikings, forgers of crucible steel and the Ulfberht Sword.
A look at the societies that flourished 2,000 years before Christ.
A look at the areas around the world where planes, ships and people seem to vanish without a trace.
Humpback whales have come back from the brink of extinction, but they are difficult to approach.
As people go about their daily lives, few stop to think about what their food is really made of.
At the height of its power between the 9th and 15th centuries, Angkor was a resplendent city, considered the most extensive urban complex of the pre-industrial world. But by the late 16th century, the empire was in its death throes.
Almost everywhere is over 30 C and some places in the south are even reaching 50 C.
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