By SUSAN DYNARSKI, NY Times
A single teacher can reach thousands of students in an online course, opening up a world of knowledge to anyone with an internet connection. This limitless reach also offers substantial benefits for school districts that need to save money, by reducing the number of teachers. But in high schools and colleges, there is mounting evidence that the growth of online education is hurting a critical group: the less proficient students who are precisely those most in need of skilled classroom teachers. Online courses can be broken down into several categories, and some are more effective than others.
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