College students in a classroom.
College students in a classroom. - 
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Would you rather have a teacher or a computer grade your schoolwork?

EdX, a Harvard-MIT project, will offer essay grading software to colleges free of charge. You might imagine that teachers and professors, who often have to tackle a pile of student essays as high an elephant's eye, would embrace the labor saving. But, not all professors do.

Jonathan Zittrain, professor of law and computer science at Harvard, joins Marketplace Tech host to explain how the computer program works and whether it measures up to the human eye.