The timeline in the News story 'Cancer trial errors revealed' ( Nature 469, 139–140; 2011) stated that Harold Varmus asked the Institute of Medicine to review Duke University's trials in June 2010. He made this request in July 2010.

The News story 'Tevatron faces final curtain' ( Nature 469, 141; 2011) states that the Mu2e experiment will study the decay of muons to electrons. In fact, it will look for evidence of neutrino-less conversion of muons to electrons.

The story 'Science fortunes of Balkan neighbours diverge' ( Nature 469, 142–143; 2011) wrongly referred to the Romanian Academy of Sciences — it should have said the Romanian Academy. Also Bulgaria cut the budget of its Academy of Sciences by 38% to 60 million leva (US$40 million), not 75 million leva as stated.