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Hear harrowing stories from survivors of Moore’s massive tornado and meet scientists who...
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A meteor burst into a fireball over Siberia. Can we spot the next deadly asteroid in time?

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After a massive extinction, diverse marsupials came to dominate this isolated continent...
NOVA  ·  Episode 4014

Manhunt—Boston Bombers


Which technologies worked—and which didn't—in the race to track down the men behind the marathon attack?

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