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Wal-Mart To Pay $81 Million For Hazardous Waste Dumping

The retail giant pleaded guilty to improperly disposing of toxic pollutants in California and Missouri in the period 2003 to 2005.
NPR

The Business And Science Of Storm Shelters

There are no definitive numbers on how many people were saved by storm shelters in the deadly tornado in Moore, Okla. There's little doubt that those who sought cover in previously-installed underground shelters and safe rooms were protected. Still, most people in high-risk areas don't have them.
NPR

Beneath A Glacier's White, Researchers See Green

Underneath a receding glacier in the Canadian Arctic, researchers found something surprising: a kind of plant related to moss that was not only still green, but also growing.
NPR

Study Is First To Chart Amphibian Populations' Decline In U.S.

Populations of frogs, salamanders and other amphibians are declining at an average rate of 3.7 percent each year, according to a U.S. Geological Survey study released this week.
NPR

'Crazy Ants' Spreading In The Southeastern US

In parts of the southeastern US, aggressive fire ants have been driven out by an even more recent arrival, the tawny crazy ant. Edward LeBrun, a researcher at the University of Texas at Austin, describes the newcomers and how one invasive species can out-invade another.
NPR

Tracking Killer Tornadoes

A series of tornadoes struck the central United States this week, including a powerful storm in Oklahoma that killed at least 24 people. Marshall Shepherd, the president of the American Meteorological Society, describes the ingredients of major tornadoes, and how they are predicted.
NPR

Reinventing Farming For A Changing Climate

Scientists say climate change could increase pests and weeds, lengthen growing seasons and turn dry soil to dust. Farmers are already on the offensive, adopting no-till cropping methods to conserve water and experimenting with different seeds. And scientists are using a technique called gene silencing to develop new crops--without tinkering with the plants' DNA.

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