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The difference between computer simulations and computer games is subtle but important. At the core, the distinction is that simulations are about things (or systems) and how they behave, and games are about a fun user experience. That distinction may be a bit too rigid, however....

This summer, when your kids' favorite science museum boasts a new augmented-reality environmental simulation? Same deal. If in the next few years a video game teaches you anything - how to conserve energy, eat a balanced diet or solve quadratic equations - consider the invisible hand of one of the most unconventional White House hires in recent memory.