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Ice Mummies
Archeologists from the Andes to the Alps and beyond learn about lost cultures from remarkably well-preserved human remains.

The Incredible Journey of the Butterflies
Follow the 2,000-mile migration of monarchs to a sanctuary in the highlands of Mexico.

Into the Abyss
A daring expedition attempts to retrieve several "black smoker chimneys" from the seafloor a mile and a half down.

Infinite Secrets
A battered manuscript turns up after 1,000 years, revealing the mind of the Greek genius Archimedes.

Island of the Sharks
Visit Costa Rica's Cocos Island, which boasts more sharks per cubic yard of water than perhaps any other place on the planet.

Island of the Spirits
On the island of Hokkaido in the far north of Japan lives an extraordinary spectrum of life.

Is There Life on Mars?
The decades-long search for life on the Red Planet heats up with the discovery of frozen water.