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The Microsoft founder and philanthropist talks with NPR's David Greene about why he's spent billions on health efforts in developing countries, and about the prospect of beating polio and malaria.

In Tuesday's Senate GOP primary, there's little ideological difference between the top candidates, and no one can lay exclusive claim to Tea Party support.

It's clear this year that this will not be another 2010 or 2012, when upstarts embarrassed the GOP's conventional favorites in primary after primary.

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.

What rights do participants in an airline's frequent-flier plan have to their miles or points? That's the question before the U.S. Supreme Court on Tuesday, when the justices examine whether, and under what circumstances, frequent fliers can sue in these disputes.

If not for flawed classification of deaths, medical mistakes would be the third leading cause of U.S. deaths, Johns Hopkins researchers say. They're calling on the CDC to track deaths from errors.

The documentary Help Us Find Sunil Tripathi explores what happened after a tweet misidentified a Brown University student as one of the Boston Marathon bombing suspects.

The two nations topping the world in greenhouse gas emissions agreed at the Paris talks to cut way back. But critics have stalled a key part of the U.S. plan, and China's good start may be fragile.

Paul Ryan has been speaker of the U.S. House of Representatives for almost six months. How hard is his job about to get ahead of the Republican National Convention?

The former Virginia governor and his wife were charged with 11 counts of conspiracy to commit fraud under federal law. Now, the nation's top court will decide whether to uphold the conviction.