A multi-lab test of the facial feedback hypothesis by the Many Smiles Collaboration - Coles, Nicholas A.; March, David S.; Marmolejo-Ramos, Fernando; Larsen, Jeff T.; Arinze, Nwadiogo C.; Ndukaihe, Izuchukwu L. G.; Willis, Megan L.; Foroni, Francesco; Reggev, Niv; Mokady, Aviv; Forscher, Patrick S.; Hunter, John F.; et al. (Nature Human Behaviour, 2022)