"They thought they'd managed this problem a few years ago. But Washington state Gov. Jay Inslee got a disturbing call Friday from Energy Secretary Steven Chu: Nuclear waste is leaking out of a tank in one of the most contaminated nuclear waste sites in the U.S."

"U.S. farmers will plant crops this spring under the shadow of a persistent drought that grips prime farmland from the mississippi river to the rocky mountains, with grain supplies already tight from drought losses in 2012."

"Event billed as largest climate protest in US history intended as show of force as Obama nears decision on controversial project."

Are people exposed to doses of bisphenol A in their canned foods and other consumer products that can harm them? Or are the amounts too low to cause any harm? This is the crux of a vehement debate that is being waged as federal officials are trying to decide whether the chemical, known as BPA, should be regulated."

"Autism certainly involves the brain, but researchers increasingly believe it is actually a collection of problems that affects the whole body, the accumulation of seemingly minor events that start in the womb. PAULINE TAM unravels the complexity of factors that combine to cause the disorder."

"SIMI VALLEY, Calif. -- NASA has agreed to an 'excessive and unnecessarily costly cleanup' of a former rocket test facility near Los Angeles that was the site of a partial nuclear meltdown in 1959, the space agency's watchdog said Thursday."

"What happens to fish that swim in waters tainted by traces of drugs that people take? When it's an anti-anxiety drug, they become hyper, anti-social and aggressive, a study found. They even get the munchies."

"Anonymous billionaires donated $120m to more than 100 anti-climate groups working to discredit climate change science."

"A U.S. District Court in Denver handed down a precedent-setting decision on Wednesday, ruling that the Bureau of Land Management must reveal the names of companies or individuals nominating public land for oil and gas drilling."

"A newly discovered asteroid about half the size of a football field will pass nearer to Earth than any other known object of its size on Friday, giving scientists a rare opportunity for close-up observations without launching a probe."