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Zircon Chronology: Dating the Oldest Material on Earth

The mineral zircon serves as a tiny time capsule, recording geologic events—it's especially useful because the oldest discovered grains (4.2 billion to 4.3 billion years old) are not much younger than the Earth itself.

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James Hutton: The Founder of Modern Geology

Until the late 18th century, most people believed the Earth was about 6,000 years old. Hutton changed this belief by proposing that geologic forces operate at the same rate today as in the past.

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Inge Lehmann: Discoverer of the Earth's Inner Core

Each one of the thousands of earthquakes that occur every year offers a brief glimpse of what's happening deep inside the Earth. Lehmann used seismic signals to change our knowledge of the Earth's core.

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Jesup Revisited

In the past century, how much has life changed in the North Pacific? Explore this question with photographs on display in eight regional museums in the Russian far east.

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Reefs in Crisis

Humans have harmlessly harvested coral reefs for thousands—or even hundreds of thousands—of years. So why has our behavior in recent years suddenly put reefs at risk?

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Jaguars

Because they feed on everything from monkeys and pacas to armadillos and alligators, jaguars play a key role in the rain forest ecosystem. Learn how protecting them safeguards the jungles of Belize.

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The Green Guerillas

From a humble start 25 years ago tossing seed-filled water balloons into abandoned city lots, the Green Guerillas have grown into an organization that has created and maintains 1,000 urban gardens.

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