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The Dow Jones industrial average tacked on 109 points Thursday for a gain of less than 1 percent. But the small rise brought a big milestone, as the industrial index closed above 16,000 for the first time in its history. The index had touched the mark earlier this week but fell short by the day's end.

At Oak Ridge National Laboratory, scientists use a powerful computer known as Titan to simulate everything from the inner workings of a nuclear reactor to the complicated effects of climate change on human populations -- on a global scale. Until recently, Titan was the most powerful supercomputer on the planet, but now there's a new No. 1.

An obscure tax code provision crafted for drug dealers is giving state-licensed medical marijuana dispensaries a headache.

One of President Obama's gun control proposals appears to have widespread support -- universal background checks for gun purchases. Some experts on mental health and gun violence find problems with the current laws, and they say the system doesn't do a very good job of predicting and preventing gun crime.

An oft-repeated bit of campaign advice held that, "It's the economy, stupid." But maybe in this mid-term election cycle, that's not quite right.

The Quechan Indian Tribe is seeking an injunction to stop a large wind project adjacent to Anza-Borrego Desert State Park. The tribe says the federal government has ignored its concerns about potential damage to cultural and archeological sites.

Just five days before Election Day, President Obama returned to the campaign trail after spending several days preoccupied with overseeing the federal response to the devastation in the Northeast in the wake of Superstorm Sandy.

A federal regulator is blocking the government-owned mortgage giants Fannie Mae and Freddie Mac from reducing the principal that homeowners owe on their mortgages in order to avoid foreclosures.

President Barack Obama wants to hire 40 immigration judges to deal with the flood of Central American children and families arriving at the U.S. border with Mexico, but an immigration judge in California says it won't be enough.

Late-season storms that provided a robust snowpack and improved pumping conditions have prompted the federal government to increase water supplies to San Joaquin Valley farmers.