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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.

President Obama said Tuesday he will nominate Marine Gen. Joseph F. Dunford to be the next chairman of the Joint Chiefs of Staff, the nation's highest-ranking military officer.

Right now, solar panels make electricity. But a team of engineers in California wants to take solar energy one step further. They're trying to create a device that uses sunlight to make a liquid fuel that goes in our gas tanks.

Authorities have dropped charges against a man accused of mailing ricin-laced letters to President Obama and Congress.

Florida Republican Senator Marco Rubio hit the Sunday morning TV talk shows to promote, and preemptively defend, the bipartisan immigration overhaul that is expected to be released this week. Rubio appeared on seven nationally broadcast shows.

Same-sex marriage got huge headlines at the Supreme Court last month, but in the world of science and medicine, the case being argued on Monday is far more important. The lawsuit deals with a truly 21st century issue that in some cases can pit drugmakers against patients.

Director Sam Raimi and star James Franco can't provide enough pizzazz to carry Oz the Great and Powerful aloft. Their effects-heavy prequel to 1939's Wizard of Oz serves up a long-winded answer to a question most probably weren't asking.

In the 19th century, Bolivar freed six countries from Spanish rule. Almost 200 years later, the warrior statesman is still a widely celebrated Latin American hero, but his story is also little understood. In a new biography, Marie Arana aims to separate fact from fiction.

The White House is cheering a better than expected jobs report. But economists caution that automatic government spending cuts could lead to slower job growth in the months to come.

The Trump administration is citing wildfire suppression as the reason it's seeking to undo the Roadless Rule. Science suggests more roads will cause more fires.