It costs the United Kingdom £161 million per week to be in the EU, not £250 million, as stated in the Editorial ‘Turning point’ ( Nature 534, 295; 2016). The News story ‘Gene therapies pose million-dollar conundrum’ ( Nature 534, 305–306; 2016) should have said that cancer drugs that unleash the power of the immune system cost up to $40,000 per month, not per year. And the News Feature ‘The secret history of ancient toilets’ ( Nature 533, 456–458; 2016) incorrectly said that roundworms and whipworms cause dysentery — they cause problems such as malnutrition.