The Outlook article 'Industrial strength' (Nature 537, S57–S59; 2016) incorrectly stated that the 1999 trial at the University of Pennsylvania was based on a retrovirus; it was in fact based on an adenovirus.

Also, the Outlook Q&A 'Illuminated Universe' (Nature 537, S205; 2016) incorrectly gave the amount of dark energy in a cubic metre of space as 10–27 kilograms instead of 10−27 kilograms.