This article talks about a prominent researcher and an elementary school who teamed up last year to identify what works--and what does not--when it comes to teaching young children about gender bullying. Rebecca Bigler, a psychologist at the University of Texas-Austin whose nationally recognized research focuses on racial stereotyping and gender role development, organized a research project to determine whether young students could be taught to challenge sexist remarks made by their peers--and, if they could be, whether their gender attitudes would change. The study was conducted at St. Francis Elementary among students in kindergarten through 3rd grade. What worked, it turns out, was not reading about people who defy gender stereotypes. What affected students' attitudes and behaviors was learning and practicing what to say when gender bullying occurs. Although this study has limitations, its findings are clear: Teachers and schools need to talk explicitly with young children about gender bullying and how to interrupt it.