A tree-climbing scientist takes the measure of a 3,200-year-old, 247-foot-tall sequoia.
National Geographic on TV: Big Cat Week
Find out why you shouldn’t panic—at least, not yet.
Once heavily hunted for its valuable skin but now protected, Brazil's yacare caiman is striding back in gratifying numbers.
Visions: Your Shot
Next: Jellyfish Currents
Nuclear Power, Risking a Comeback - It's controversial. It's expensive. And it might just save the Earth.
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