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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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Back to the Moon
Discover why scientists and entrepreneurs alike have their sights set on the Moon again.
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Ice Age Footprints
Ancient footprints provide new evidence of humans and extinct giant beasts of the Ice Age.
NOVA
Decoding da Vinci
Discover the science behind Leonardo da Vinci's masterpieces—and Mona Lisa's iconic smile.
