Is al Qaeda a Real Threat?

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Is al Qaeda becoming more powerful? Two years after Osama bin Laden was killed, there are fears the terrorist group is planning attacks from Yemen and other countries. Also, new revelations about NSA monitoring of US correspondence, and the fascinating case of Henrietta Lacks, the African American woman who died young from cervical cancer. Her cells would be used by science to save the lives of millions of people. Now her  family has a say in what the future research will be. Madeleine Brand guest hosts.

Banner image: A police trooper checks a van at the entrance of Sanaa International Airport August 7, 2013. Al Qaeda's Yemen-based branch AQAP has been behind plots against Western targets and neighbouring Saudi Arabia. Photo: Khaled Abdullah/Reuters