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Online learning: Campus 2.0 : Nature News & Comment 

“When one professor can teach 50,000 people it alters the economics of education.” 

“Restructuring even one lecture into short, self-contained segments takes a fair amount of thinking.” So does coming up with good, compelling questions to engage the students between the segments. Then there is the push for high-quality production, he says. “It takes many hours to produce one hour of quality video.” 

But there is also no substitute for a conversation.