Scientists: Endangered frog rebounding in Yosemite park (Update)

A native California frog once on the brink of extinction is making an encouraging comeback in Yosemite National Park, raising hopes for amphibians like it worldwide that are dying off at an alarming rate, researchers said ...

Energy industry develops nontoxic fracking fluids

The oil and gas industry is trying to ease environmental concerns by developing nontoxic fluids for the drilling process known as fracking, but it's not clear whether the new product will be widely embraced by drilling companies.

Security flaws could taint 2012 US election: report

Security flaws in voting technology in a number of US states could taint the outcome of the 2012 election, a study concluded Wednesday, saying it was "highly likely" some systems will fail.

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