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For the second time in less than a decade, the D.C. Public Schools system has shown it can’t count, overstating its population by as much as 13,000 students. An external audit of the school system’s aging facilities matched census data with school enrollment records and uncovered the error. The cause of the discrepancy is unclear—school officials are currently hand-counting students—but it is worth noting that each principal is awarded funds and teachers based on the enrollment at his or her school, and that the inflated numbers also crank up additional federal matching funds. When enrollment drops midyear, most principals are loath to correct stats, fearing cuts to appropriations and personnel.