Science

Early Americans Mined Iron to Make Art, Not War

Fast-Growing Redwoods Break the Law

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Giant Footprint

How the world's 6.6 billion people threaten the health of the ecosystem

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Roots of the Sea

What mangroves give the world and why we can't afford to lose them

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Mountain Messengers

Scientists scale peaks and study plants to understand the impact of warming

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Up in Smoke

Amazon research that has withstood thieves and arsonists now faces its greatest challenge

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Ground Thaw

Geographer Christopher Burn explains why permafrost is thawing

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Spy On "Old Faithful"

Giant Palm Found Hiding Under Madagascar Sun

Frogs on the EDGE

Maverick Wave Theory

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Turn the Page

Electronic books may soon vie with library cards for space in your pocket

Jeweler Harry Winston donated the famous Hope Diamond—the largest-known deep blue diamond in the world—to the Smithsonian Institution in 1958. It arrived in a plain brown package by registered mail, insured for one million dollars. Surrounded by 16 white pear-shaped and cushion-cut diamonds and hanging from a chain with 45 diamonds, the rare gem attracts 6 million visitors a year to the Natural History Museum.

Glow-in-the-Dark Jewels

How the Hope Diamond's mysterious phosphorescence led to "fingerprinting" blue diamonds

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The Big Red Hope

"Tinkerbell" in Southern Skies

Despite $100 Oil, U.S. Gas Still a Bargain

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UPDATE: State of Emergency

The latest on the endangered mountain gorillas in war-ravaged Congo

What Bugged the Dinosaurs?: Insects, Disease, and Death in the Cretaceous

Did the Dinosaurs Bug Out?

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Pyramid Ages the Aztecs

Sardines

Good News-bad News in a Tin of Sardines

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