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A 17-year-old high school senior beats three different versions of artificial arms in an international robotic arm-wrestling competition. The match was a test of technology aimed at developing artificial muscles.

President Bush taps a career civil servant and biologist to become the next head of the Environmental Protection Agency. Stephen Johnson has worked at the EPA for 24 years, most recently as the agency's acting head. He will be the first career EPA official to head the agency.

A report from scientists who advise the government concludes that the levels of the toxic chemical perchlorate currently found in drinking water do not pose a major threat to the nation's health. But an EPA report from 2002 -- and some environmental groups -- contradict that finding. NPR's Jon Hamilton reports.

President Bush announces Environmental Protection Agency head Michael Leavitt as his choice for secretary of the Department of Health and Human Services. Leavitt would take over the post vacated by outgoing Secretary Tommy Thompson. Hear NPR's Don Gonyea.

A team from the Environmental Protection Agency undertakes the difficult task of cleaning up spilled mercury at Cardozo High School in Washington, D.C. No one in the school was contaminated, but the building has been closed on and off for more than a week while the cleanup proceeds.

Earlier this August, a study published in the journal Environmental Science and Technology concluded that farmed-raised salmon were found to have high levels of flame-retardant chemicals that could harm humans. Actor and satirist Harry Shearer says the answer for the salmon farmers is to take this lemon and make lemonade, with the right spin. His answer: Sammy the Flame-Resistant Salmon.

The Environmental Protection Agency announces a new rule on mercury emissions from coal-fire power plants that will phase in reductions over 20 years. The plan delays deep cuts in mercury pollution for about 10 years.

Scientists studying the biology of hunger say our cravings for the unhealthy may have a lot to do with evolution. But there's hope, too: Studies of eating behaviors suggest we may be able to lose weight by eating more.

A new NPR survey shows 11% of Americans have experienced extreme heat in the past five years and had health problems stemming from a lack of air conditioning at home.

The House Jan. 6 committee held a hearing Thursday with testimony from former DOJ officials on how Donald Trump tried to use the department to spread false claims about election fraud.