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Brazil's political and economic meltdown creates challenges for doctors trying to get a handle on the outbreak.

Janet Yellen cleared a key hurdle in her path to become the next chair of the U.S. Federal Reserve, after a Senate Banking Committee hearing went smoothly Thursday. The most difficult questions centered on the Fed's stimulus efforts.

Renewable energy has become a $220 billion a year industry. But to significantly slow climate change, the power of wind, solar and other renewable sources must vastly expand. Some say the tech breakthroughs needed are on the horizon, though a top economist sees a tougher road ahead.

Patty Stonesifer once held a top spot at Microsoft. After that, she spent years at the helm of philanthropy giant the Gates Foundation. But this year, Stonesifer downsized. She's taken on a smaller-scale role as CEO of Martha's Table, a Washington, D.C., nonprofit that serves the poor.

Half or more of U.S. households say the financial impact of the pandemic has been serious. An NPR and Harvard survey found Houston households were affected the most, especially Blacks and Latinos.

China is battling coronavirus outbreaks in six cities. More than 20 million people are in some form of lockdown.

Congressional lawmakers are sounding a new bipartisan tone against a rising threat led by Russian President Vladimir Putin. Still, there is GOP divide on how President Biden should move forward.

A new artificial intelligence program has beaten the world's best players in the popular PlayStation racing game Gran Turismo Sport. But the impact could be felt far beyond that.

President Biden wants to counter the economic might of China. He visited a semiconductor plant outside Seoul to kick off a trip aimed at his top foreign policy priority.

The Air Force Academy says it is taking measures to address concerns that Evangelical Christians exercise too much influence at the school and are trying to force their religion on others.