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Is it possible to put a dollar value on the beauty of a river or to judge the worth of a wetland? Some conservationists think so.

Allison Jarrell, Contributor

San Francisco is the first city in the United States to require retailers to notify customers about cell phone radiation levels.

Eric Betz, Contributor

Congressional committee calls for increased oversight and better credentials for medical physicists.

Audrey Hoffer, Contributor

Expert panel revisits the danger of air travel during a pandemic.

Jason Socrates Bardi, Editor

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