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The prosecution's star witness underwent a withering cross-examination on Thursday at Roger Clemens' perjury trial. Brian McNamee is the only person with firsthand evidence that contradicts the baseball-pitching ace, but is he a believable witness?

If all goes well, an unmanned capsule will become the first commercial spacecraft to visit the International Space Station. SpaceX and NASA have been working together to make this launch happen, navigating cultural differences between the young startup and the veteran agency.

As President Obama hosts leaders of the Group of Eight, he's announcing a major initiative to boost investments in rural Africa. The program aims to lift millions out of poverty and will include several billion dollars in investments from private companies.

Police say Richard Matthews stole a $20,000 diamond in Windsor, Ontario. He apparently swapped it for a fake gem and ate the real one. But police caught him. Feeding him high-fiber food, they've been waiting a week for the gem to emerge.

The social media giant's stock started trading publicly for the first time today. Interest was huge — more shares traded hands than on the first day of any other initial public offering.

A watchdog group says New Mexico lacks enough inspectors to adequately oversee the tens of thousands of oil and natural gas wells across the state.…

Mitt Romney releases his first general election campaign ad. Plus wealthy GOP investors say their super PAC won't run a smear campaign connecting controversial pastor Jeremiah Wright with President Obama. Host Michel Martin discusses the latest political developments with Lenny McAllister of Politic365.com and author Michael Fauntroy.

Prosecutors released a trove of new information detailing the investigation of Trayvon Martin's death. Martin was the unarmed Florida teen killed by neighborhood watch volunteer George Zimmerman in February. Host Michel Martin speaks with NPR's Greg Allen, who says the material could be helpful to both sides in the case.

Some of the world's fastest growing economies are in Africa. But hunger is still a widespread reality there, and will be a major topic at this weekend's G8 summit. Host Michel Martin discusses efforts to fight hunger on the continent with USAIDs Tjada McKenna and Mwiza Munthali of the advocacy group TransAfrica.

The decision comes months after the U.S. announced that countries that criminalize homosexuality could face cuts to their foreign aid.