NASA (National Aeronautics and Space Administration) is currently undertaking a project called Learning Technology with the goal of developing new and innovative ways to educate people on science, technology, engineering, and mathematics.

Currently, NASA LT is is exploring the possibility of developing an educational Massively Multiplayer Online Game. This project definitely has a lot of potential as pointed out by the project's official site:

Virtual worlds with scientifically accurate simulations could permit learners to tinker with chemical reactions in living cells, practice operating, and repairing expensive equipment, and experience microgravity, making it easier to grasp complex concepts and transfer this understanding quickly to practical problems.