In an in-depth investigative series, Erin Richards of the Milwaukee Journal Sentinel looks at how high rates of student mobility -- changing schools at least once during an academic year -- hurts their academic progress. Among the findings: 1 in 10 students statewide are moving between campuses annually. The figure is significantly higher in Milwaukee, where 1 in 4 students change schools during the year. How do Wisconsin’s school choice options factor into student churn? How did Richards crunch the data? And what solutions are educators and policymakers floating to combat mobility? Richards, who recently joined USA Today as a national education reporter, offers story ideas for local journalists looking at high turnover in their own districts.