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Educator's Guide for CNN Presents
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AIRS: Sunday, 8 p.m.  |  Additional air times
Harsh Continent

If there is a final frontier on Earth, it is the forbidding ice and frozen tundra of Antarctica. The story »

GALLERY: Life at the bottom of the Earth
QUIZ: Penguins, ice channels and explorers
NOTEBOOKS: The harsh continent | 'Weird mojo'
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