More than half of the country's teachers are baby boomers, and states like Colorado already are experiencing a trend of younger, less experienced teachers. To draw more teachers to high-needs classrooms, the Denver public-school system is allowing career-changers to become teachers without a degree in education and offering incentives to retain teachers and prevent turnover. "Our highest focus is: How do we retain our best teachers and how do we get them in our neediest schools?" Denver's superintendent said.
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