This article summarizes key findings of the American Association of University Women (AAUW)'s research report, "Why So Few? Women in Science, Technology, Engineering, and Mathematics" (2010). The report profiles research that demonstrates how social and environmental factors—including stereotypes, cultural beliefs, and implicit bias—act as barriers to girls’ and women’s full participation in these fields. This article provides a brief explanation of their findings and recommends what science centers and museums can do to promote girls' participation in science and math. The full report is