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Facebook will use members' Web browsing habits to help advertisers target their ads more effectively. Facebook also announced a feature that allows users to see why targeted ads are coming their way.

Clinton's new memoir, Hard Choices, outlines her four years as secretary of state under President Obama. She talks about her vote for the Iraq War, women's rights and political "gamers."

Brazil and Croatia face off in the first game of the 2014 World Cup. Organizers hope the start of the tournament directs attention back on the field and away from the problems in preparation.

Pulitzer Prize-winning poet Charles Wright, who will serve as the next poet laureate, tells NPR's Melissa Block that his inspirations — landscape, language and God — have stayed constant for 50 years.

The militant group known as the Islamic State of Iraq and Syria already controls the cities of Mosul and Tikrit, and has now taken towns in Diyalah province.

The Army sergeant spent five years as a captive of the Taliban. He arrived at Brooke Army Medical Center in San Antonio early Friday morning after spending nearly two weeks recuperating in Germany.

A new study of athletes suggests exercise may help support a rich, diverse mix of bacteria in the gut. But scientists say the athletes' high-protein diet may also be supporting the community.

The next time this phenomenon will happen is Aug. 13, 2049.

In a country shaped by warlords, Saturday's presidential election features two urbane men with doctorates vying to replace Hamid Karzai. Both want close U.S. relations, including a security deal.

Host Michel Martin looks at gun culture in the America and abroad, and asks two experts what the U.S. can learn from how other countries handle firearms.