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Absolute Zero
The story of the harnessing of cold and the race to reach the lowest temperature possible

America's Stone Age Explorers
Who were the first Americans, and where did they come from?

Ancient Creature of the Deep
Meet the coelacanth, a bizarre fish and "living fossil" that has changed little in its 400 million years on Earth.

Ancient Refuge in the Holy Land
Israel's remote Cave of Letters holds clues to a Jewish uprising against the Romans.

Animal Hospital
High-tech health care comes to veterinary medicine—radiology to surgery, intensive care to sports medicine.

Ape Genius
Experts zero in on what separates humans from our closest living relatives.

Arctic Passage
Relive two legendary expeditions—one tragic, one triumphant—to pioneer a route through the Northwest Passage.

Astrospies
An elite corps of secret U.S. astronauts is trained to gather intelligence on the Soviets during the Cold War.

Avalanche!
Scientists take you inside a snow slide to unlock its deadly secrets.