In this photo taken Nov. 15, 2012, Peter Struck, Associate Professor of 

In this photo taken Nov. 15, 2012, Peter Struck, Associate Professor of Classical Studies at the University of Pennsylvania, left, has a microphone attached by technology coordinator Jordan Boggs as they prepare to record a lecture by Struck on Greek Mythology in Philadelphia. In 15 years of teaching, Struck has guided perhaps a few hundred students annually in his classes on Greek and Roman mythology through the works of Homer, Sophocles, Aeschylus and others — "the oldest strands of our cultural DNA." But if you gathered all of those tuition-paying, in-person students together, the group would pale in size compared with the 54,000 from around the world who, this fall alone, are taking his class online for free — a "Massive Open Online Course," or MOOC, offered through a company called Coursera. (AP Photo/Matt Slocum)
Associated Press
In this photo taken Nov. 15, 2012, Peter Struck, Associate Professor of Classical Studies at the University of Pennsylvania, left, has a microphone attached by technology coordinator Jordan Boggs as they prepare to record a lecture by Struck on Greek Mythology in Philadelphia. In 15 years of teaching, Struck has guided perhaps a few hundred students annually in his classes on Greek and Roman mythology through the works of Homer, Sophocles, Aeschylus and others — "the oldest strands of our cultural DNA." But if you gathered all of those tuition-paying, in-person students together, the group would pale in size compared with the 54,000 from around the world who, this fall alone, are taking his class online for free — a "Massive Open Online Course," or MOOC, offered through a company called Coursera. (AP Photo/Matt Slocum)
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