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The University of Washington is joining a massive, free experiment in online education that adherents believe has the potential to revolutionize the way college classes are taught, open up access to some of the university's most sought-after courses, and drive down the cost of a degree.

The university has signed a contract to provide an online startup called Coursera with courses in math, computer science, computational finance and information security. Coursera already provides free courses to anyone wanting to participate, although students do not earn credit, at least for now.