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Passport: Show | Hide

Which technologies worked—and which didn't—in the race to track down the men behind the...
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After a massive extinction, diverse marsupials came to dominate this isolated continent...

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Some 250 million years ago, some of the largest, most dangerous reptiles ruled this land.
NOVA  ·  Episode 4013

Meteor Strike


A meteor burst into a fireball over Siberia. Can we spot the next deadly asteroid in time?

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