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(Reuters) - Environmental groups filed suit on Thursday seeking federal regulation of lead in ammunition, claiming exposure to the toxic metal from spent bullets fired into the environment by hunters kills millions of birds and poses a risk to human health. The Center for Biological Diversity was among 100 organizations that this year unsuccessfully petitioned the U.S

As a first line of defense, steel barrels buried deep underground are designed to keep dangerous plutonium waste from seeping into the soil and surrounding bedrock, and, eventually, contaminating the groundwater. But after several thousand years, those barrels will naturally begin to disintegrate due to corrosion. A team of scientists at Argonne National Lab (ANL) in Argonne, Ill., has determined what may happen to this toxic waste once its container disappears.

Hopes for new Alzheimer's drugs that would slow or stop the disease's inexorable decline have repeatedly foundered in recent years. Large pharmaceutical companies, which have pushed ahead with drugs that stop the buildup of toxic proteins that damage and kill brain cells, have reported a recurring string of bad news.

For months, many New York City firefighters worked in the toxic air at ground zero, digging through the rubble of the World Trade Center. Now, as Dr