US President Barack Obama on Tuesday condemned African leaders who refuse to give up power at the end of their terms in office, as he made the first address to the African Union (AU) by a US leader. "Africa's democratic progress is at risk when leaders refuse to step aside when their terms end," Obama said in a speech at the AU's headquarters in the Ethiopian capital Addis Ababa.

Barack Obama has arrived in Kenya on the first visit to his ancestral home as serving US president. During his two-day visit Mr Obama will hold talks with Kenyan President Uhuru Kenyatta and other top officials. Trade will feature strongly, but Mr Obama also said he would deliver a "blunt message" to African leaders about gay rights and discrimination.

Street artist Shepard Fairey and the Viacom-owned MTV, home to teen moms and teen wolves, are the Felix and Oscar of American culture wars. That they found common ground is something of a triumph. Their web series, Rebel Music, now in its second season, spotlights creative teenagers who express themselves in a dismissive world. From Iranian metal heads to Native American DJ environmentalists, Rebel Music encompasses the punk art gamut.

NEW YORK -- NBC News has walked back its Monday report that a Pakistani intelligence officer provided the CIA with Osama bin Laden’s whereabouts a year before the U.S. raid in May 2011, a claim