"With its open-ended nature and robust creation tools, Minecraft has been used to create some amazing things. And as one teacher learned, those very same elements that make the game so compelling also make it a great educational tool. Around two months ago, Joel Levin, a computer teacher at Manhattan's Columbia Grammar and Preparatory School, decided to start using the game to teach an entire unit to his first- and second-grade students. The lessons took place almost entirely in the world of Minecraft. And it was a huge hit."