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Vermont Sen. Bernie Sanders is the favorite heading into the caucuses, but polls have shown a tightly jumbled race at the top. Here are key questions and answers about Monday night.

The president says no one told him about the threat to U.S. troops in Afghanistan. Reports say the information was available in a detailed intelligence file called the President's Daily Briefing.

A new color-coded map, backed by a coalition of top scientists, provides a way of comparing outbreak severity across communities, down to the county level.

Charles Booker, a Black progressive state representative, is mounting a strong challenge to Amy McGrath, the veteran recruited by top Democrats to run against Senate Majority Leader Mitch McConnell.

In the early 2000s, war games about pandemics popped up. But participants say the outbreak threat couldn't compete with more visible national security concerns such as wars and terrorist attacks.

How much will Donald Trump pad his lead, and what will Ted Cruz do next? Even if Bernie Sanders wins, Hillary Clinton's lead is virtually insurmountable. And the GOP Senate primary is one to watch.

A top education analyst says the U.S. probably could get some more people through college by footing the bill, and it would probably pay for itself. But it isn't an open-and-shut case.

Jeb Bush's shifting positions on the Iraq War gave an opening to Republican rivals for the presidential nomination. And will Hillary Clinton answer questions directly on her trip to Iowa next week?

Three states go to the polls Tuesday, starting what will be an eight-week stretch of primaries in the U.S. For a look at the intra-party political landscape, NPR's Charlie Mahtesian has this overview.

Photographer Andria Hautamaki is used to limited connectivity, living on an off-grid ranch in Chilean Patagonia. Now, her access to the Internet and other humans is further reduced.