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Online courses look for a business model

Professor Jeremy Adelman has taught a world-history class at Princeton University for several years, but as he led about 60 students through 700 years of history on the ivy-covered campus this past fall, one thing was different: Another 89,000 students tuned into his lectures free of charge via Coursera, an online platform.

More by Melissa Korn and Jennifer Levitz for The Wall Street Journal.