"Digital instruction faces limits. Online, you will never smell a burning resistor or get your hands wet in a biology lab. Yet the economics of distributing instruction over the Web are so favorable that they seem to threaten anyone building a campus or hiring teachers. At edX, Agarwal says, the same three-person team of a professor plus assistants that used to teach analog circuit design to 400 students at MIT now handles 10,000 online and could take a hundred times more."
— Coursera, edX, and MOOCs Are Changing the Online Education Business
