By carefully logging students’ every action online, a company called Knewton says, it can personalize questions and lessons to help people learn faster. Skeptics say that’s not proven.
By Tom Simonite
Why: Social gaming has dramatically expanded the demographic appeal of computer games and created new business models for game companies.
Key innovation: Zynga has mastered the art of giving away games and then persuading players to make in-game purchases of virtual goods, sometimes adding up to many times the typical purchase price of a game.