Paluck, E. L. (2009). Reducing intergroup prejudice and conflict using the media: a field experiment in Rwanda. Journal of personality and social psychology, 96(3), 574.
Providing villages in post-genocidal Rwanda access to a radio soap opera that described positive norms of intergroup relationships led villages to be less likely to require that their children marry within their group, to be more willing to speak out in dissent, and to report more empathy for other Rwandans.