Margaret Warner talks to former Reagan administration official Michael Pillsbury and The Nation's Robert Dreyfuss on what past endeavors by the United States to offer military aid to rebel movements can teach government officials today about providing weapons to the Syrian opposition.
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The P4 laboratory, on the campus of the Wuhan Institute of Virology, in Wuhan, in China's central Hubei province. (Hector Retamal/AFP via Getty Images)