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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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.
Dr. Keri treats small cats, and then sees firsthand how those issues can arise in big cats.
Trying some traditional and new dog sports to find out how to keep dogs fit and mentally healthy.
Dr. Keri's dog, Siri, brings home a wild baby fox, which starts her on a quest to learn more about caring for wildlife.
Dr. Keri looks after bulls who seem determined to hurt themselves.
French Polynesia's great hammerhead sharks are extraordinarily shy animals.
The atoll of Fakarava in Polynesia is a true underwater paradise.
Satellites of all sizes; how satellites are made and tested; the building of NASA's ICESat 2.
How rockets are made; how they blast off and make their way through the Earth's atmosphere.
Outer space; sending tourists into space; Virgin Galactic; the International Space Station.
The moon; teams competing for the Google Lunar X Prize; returning to the moon.
Creating and testing high-altitude balloons to survive the rigors of near space.
The seahorse; the Thomson's gazelle.
Creatures of Asia: the snow leopard; the Komodo dragon.
Creatures of Europe: the mongoose; the dragonfly.
Creatures of North America: the Canada goose; the beaver.
Creatures of South America; a jaguar's jaws' ability to crush bone; Galapagos tortoise.
Using squids to create a new kind of camera; tiny shrimp help scientists create bullet-proof armor.
Danni Washington explores the world of bio-hybrid science.
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