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Fist bumps and high-fives -- it's how principal David Wilson interacts with students as he walks down the halls of Chaparral High School in Las Vegas.

The unconventional style is a trademark of Wilson, who was brought to the high school in 2010 as part of a turnaround effort by the Clark County School District. At the time, Chaparral was one of the worst-performing high schools in Nevada, a state that ranks near the very bottom in national graduation rates.

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