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Grades 9-12



Article: Zircons Recast Earth's Earliest Era

Rocks older than 4 billion years are not available to study, making the first 500 million years of Earth's history particularly mysterious. But cutting-edge techniques are now allowing geologists to study survivors of Earth's early era.



Species and Sprawl: Humans

Sprawl is affecting Homo sapiens as it does many other species: it alters our habitat, hampers our mobility, and diminishes odds for survival.



Species and Sprawl: Yellow Starthistle

Seeds can't move by themselves, so they rely on moving things to give them a lift. Discover how cars are taking homespun seed dispersal mechanisms to a new level.



Species and Sprawl: Mountain Lions

What's the animal-friendly antidote to California's urbanization? Some believe the solution is to make the corridors between disparate patches of wild lands truly useable by many different species.



Elephants Return to the Forest

Unlike most zoo-raised or domestic species, Asian elephants have never been selectively bred, so they remain genetically wild. See how this helps with forest reintroduction efforts. 



The Burdens of a Beast

Unlike people in Africa, who kept their distance from elephants except to hunt them, people in Asia have lived closely with elephants since at least 2000 B.C. Take a closer look at the underlying bond that exists today. 



Asian Elephants: Threats and Solutions

The Asian elephant once roamed from the Tigris and Euphrates rivers in western Asia as far east as China's Yangtze River. Take a closer look at this now highly endangered species. 



The Past and Future Vigor of an Urban River

In April 1609, English explorer Henry Hudson set sail in his ship the Half Moon in search of a Northwest Passage to the Pacific Ocean. While he didn't find it, he did navigate the Bronx River. See how it's changed in the centuries since Hudson's voyage.


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