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Can we return apex predators to their natural environments without endangering humans?

Are we alone—and if not, what might the inhabitants of far-flung worlds look like?

Host David Pogue tries to find out if there are physical limits to how fast we can go.

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

How can cities prepare for rising seas and raging storms?

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

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