Book review of Cristina Bicchieri: Norms in the wild: how to diagnose, measure, and change social norms. Oxford: Oxford University Press, 2016, 264 pp. “Philosophy isn’t useful for changing the world,” parents of philosophy students and Karl Marx tell us (at least about non-Marxist philosophy). Cristina Bicchieri’s new book Norms in the Wild provides an impressive antidote against this worry. It stands to change of social practices as Che Guevara’s Guerrilla Warfare stands to political revolutions. Bicchieri combines hands-on advice on how to change social practices with compelling theoretical analyses of social norms.