"The numbers are incredible," says photographer Suzi Eszterhas of the multitudes of migrating wildebeests that cross from Tanzania to Kenya and back each year.

For Wildebeests, Danger Ahead

Africa’s wildebeest migration pits a million thundering animals against a gantlet of perils, even—some experts fear—climate change

Memories are stored in a region of the brain called the hippocampus, shown in red in this computer illustration.

How Our Brains Make Memories

Surprising new research about the act of remembering may help people with post-traumatic stress disorder

When some turtles swim south in the fall, scores of them get trapped by Cape Cod, where many die of hypothermia.

Saving the World’s Most Endangered Sea Turtle

Stranded on Cape Cod beaches, these Kemp’s ridley turtles are getting a helping hand from volunteers and researchers

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Wild Things: Life as We Know It

Running elephants, far-flying mosquitos, ancient crocodiles and more…

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Frog Genes Haven’t Jumped Much

Icebergs Contribute to Sea Level Rise

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Exceptional Fossils Record Dinosaur Feather Changes

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Dinosaur Sighting: Dental Dinosaur

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Lost Soviet Reflector Found on the Moon

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Tyrannosaurus rex, the “Prize Fighter of Antiquity”

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UPDATED: The World’s Worst Oil Spills

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Cat Brain Inspires Computer Design

Aardonyx celestae

Digging Up Dinosaurs in South Africa

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Was “Jack the Ripper” Really a Tyrannosaurus?

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The Sun Is More Than a Blob of Yellow

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Tracks of Giants Created Dino Death Traps

While geologist don't know how long the eruption of Eyjafjallajökull could go on for, the last eruption in 1821 went until 1823.

What We Know From the Icelandic Volcano

Geologist Elizabeth Cottrell discusses the effects of the Icelandic volcanic eruption and the work of the Smithsonian’s Global Volcanism Program

Earth Day Events 2010

Learn about Earth Day celebrations in your community

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A Letter From Earth

The main plaza of Monte Albán, in the Oaxaca Valley. Building J

Bureaucracy Is Good?

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