When students return to Chelsea High School next month, they'll get more than an impeccable attendance record if they make it to class each day: They'll get cash. Under a new plan, a student who misses not a single day per quarter will receive $25 in an account - redeemable upon graduation. In doing so, the school joins a number of districts throughout the country turning to incentives to boost test scores, GPAs, and student turnout. Some schools, like Chelsea High, are focused solely on attendance. Officials there maintain that they can't carry out their mission if a student is...