The News story ‘Study aims to put IPCC under a lens’ (Nature 502, 281; 2013) said that Jean-Pascal van Ypersele was at the Catholic University of Leuven. He is at the Catholic University of Louvain in Louvain-la-Neuve. The Editorial ‘The maze of impact metrics’ (Nature 502, 271; 2013) wrongly located the University of North Texas — it is in Denton, Texas.