This study exploits the differential effects of the Vietnam War across birth cohorts to measure the effects of combat exposure on later violence and crime. Combat exposure and violent acts are measured using self-reports from the National Vietnam Veterans Readjustment Study. I find large...

We study an intensive math instruction policy that assigned low-skilled ninth graders to an algebra course that doubled instructional time, altered peer composition and emphasized problem solving skills. A regression discontinuity design shows substantial positive impacts of double-dose algebra...