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In a congressional debate in Los Angeles, a uniformed officer had to put daylight between the candidates. Things got ugly when the two Democrats discussed immigration.

A child's question and an old paradox: If the sky is filled with stars, why is it dark at night? Physicists say the answer lies in those deep dark spaces between stars — evidence of our expanding universe.

The rise could spell good news for the economy if it means the crucial holiday shopping season will bring strong sales for retailers. It also might be an indicator of how voters will be feeling when they go to the polls.

Every August, the ozone hole begins to grow over Antarctica, reaching its maximum size by late September. But by the New Year, it's gone again. Russell Schnell, of NOAA's Earth System Research Laboratory, explains the weird forces behind the ozone hole's formation--and why, in recent years, an ozone hole has capped the Arctic too.

Rumors about the former Cuban leader's health have swirled on social media for the past day, but Fidel Castro's son says the 86-year-old is just fine, exercising and going on with his everyday activities.

Malarkey is "meaningless talk, nonsense." Vice President Biden said that's what GOP vice presidential nominee Paul Ryan was spreading. Where the word came from is a bit of a mystery.

A sharecropper's son, he was appointed to the central bank's board in 1966 and served into 1974. Brimmer went on to serve the nation in other ways, including as chairman of the Washington, D.C., Control Board.

United Mine Workers officials suspect the Obama administration doesn't want to move forward on the new rules during the presidential campaign. The federal mine safety chief says the process takes time.

Willow Tufano's life over the past few months was sort of surreal. She got caught up in two dramas: America's housing market and America's media circus. Now she's trying to get her own reality show.

Though the gap between spending and revenues has narrowed, it has stayed above the $1 trillion mark.