Four major universities are joining forces with Coursera, a Silicon Valley startup, to offer free online classes in more than three-dozen subjects. iStockphoto.com hide caption

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President Obama appeared with sixth-grader Keiry Herrera of Graham Road Elementary School in Falls Church, Va., as he spoke about No Child Left Behind last September at the White House. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP