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Polar Extremes
Paleontologist Kirk Johnson explores the dynamic history—and future—of ice at the poles.
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Particles Unknown
Join the hunt for the universe’s most common—yet most elusive and baffling—particle.
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Nature's Fear Factor
Can bringing predators—and fear—back into an ecosystem help restore its natural balance?
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Ice Age Footprints
Ancient footprints provide new evidence of humans and extinct giant beasts of the Ice Age.