Since 2001, the Center for Research on Children in the United States (CROCUS) at Georgetown University has worked on a variety of research projects relating to children and public policy. Many of them have focused on early childhood education, including research on pre-K programs, child care programs, and Head Start. Faculty and students have also examined child traffic fatalities, juvenile justice, and the strategies of child advocacy groups, among other research projects. The current focus of CROCUS is the Oklahoma Pre-K program, which now reaches a higher percentage of four-year-olds than any other pre-K program in the U.S.