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The Species That Put the "Danger" in "Endangered"
From poison frogs to river dolphins, these 5 species are hanging on by a thread.
Sliced: Inside a Tornado
To find out how twisters work, researchers send probes right into the belly of the beast.
Each Grain of Sand a Tiny Work of Art
Microscopic photos of sand show that it's a lot more than just little tan rocks.
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