MIT is one of several schools that offer classes through edX, which provides free online courses in partnership with some of the country's top universities. Joe Raedle/Getty Images hide caption

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Viewers have criticized the lack of characters of color in Marvel's Agent Carter -- K. Tempest Bradford says it's just one of a long line of properties that overlook the presence of African-Americans outside of slavery, Reconstruction and the civil rights era. Kelsey McNeal/ABC hide caption

itoggle caption Kelsey McNeal/ABC