A tree-climbing scientist takes the measure of a 3,200-year-old, 247-foot-tall sequoia.
Find out why you shouldn’t panic—at least, not yet.
First printed 400 years ago, it molded the English language, buttressed the
Once heavily hunted for its valuable skin but now protected, Brazil's yacare caiman is striding back in gratifying numbers.
Isolated Socotra, 220 miles from mainland Yemen, is home to a panoply of strange plants and animals uniquely adapted to the hot, harsh, windswept island.
In his award-winning film, photographer Pete McBride follows Jonathan Waterman's attempt to paddle down the Colorado River from source to sea, with surprising results.
Tease your brain with this geometric puzzle.
Nuclear Power, Risking a Comeback - It's controversial. It's expensive. And it might just save the Earth.
Freshwater fish are dying. Scientists have a rescue plan.