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The negotiations in Vienna are aimed at limiting Iran's nuclear program in return for lifting economic sanctions imposed by the West.

The Vatican announced that Pope Francis will visit Cuba and the U.S. Sept. 19-28. He will become the first pope to address Congress.

Entrepreneurs are turning to Oak Ridge National Lab's supercomputer to make all sorts of things, including maps that are much more accurate in predicting how a neighborhood will fare in a flood.

There is an extra "leap" second in Tuesday's clock. The second is designed to keep the clocks in synch with earth's rotation, but some people would like to take it away.

After missing a loan payment, Greece is one step closer to the possibility of quitting the euro, analysts say. And, they say, the crisis poses a danger to the eurozone itself.

With New Jersey Gov. Chris Christie in the race, there are now 14 Republican candidates for president. Two more are expected to join by the end of July.

Thirty-three years of tax returns — the most ever released by a presidential candidate — show he earned $29 million since leaving office. He also paid an average tax rate of 36 percent over that time.

The residue from meth labs can cause health problems, but people aren't always told that the house they're buying is contaminated. An Indiana law requires disclosure but not mandatory testing.

Mindy Przeor founded an after-school program in Mesa, Ariz., to get elementary school kids up and running.

At its height, Martha Stewart Living Omnimedia was worth $2 billion. Her company is being sold to Sequential Brands Group for $353 million. Linda Wertheimer talks to brand analyst Liz Dunn.