Polar Extremes

Following a trail of fossils found in all the wrong places–beech trees in Antarctica, redwoods and hippo-like mammals in the Arctic–NOVA uncovers the bizarre history of the poles, from miles-thick ice sheets to warm polar forests teeming with life.

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Human Nature

We can now edit the human genome with a tool called CRISPR. But how far should we go?

Nature's Fear Factor

Can bringing predators—and fear—back into an ecosystem help restore its natural balance?

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Eagle Power

Follow eagles from the nest to the skies to see what makes these predators so remarkable.

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