Just five years after leaving the day-to-day operations of Microsoft [1], Bill Gates has become a major player in education policy [2] — and some teachers are not pleased, the Huffington Post reports. The Bill & Melinda Gates Foundation [3] has donated billions of dollars to advocacy groups and research organizations that support causes such as charter schools and standardized testing. The foundation’s ability to spend unprecedented amounts of money on education reform causes has recently made Gates unduly influential in the education world [4]…