The graphic in the News story ‘China seeks cosmic-ray win’ (Nature 543, 300–301; 2017) erroneously gave the surface area of the surface-water Cherenkov detector as 80 m2. In fact, the area is 80,000 m2. The News story ‘Ancient volcanoes exposed’ (Nature 543, 295–296; 2017) wrongly said that ancient Siberian volcanic eruptions could have raised global temperatures by 7 °C per year, rather than over 100 years. And the News Feature ‘A new twist on epigenetics’ (Nature 542, 406–408; 2017) omitted a reference (M. J. Koziol et al. Nature Struct. Mol. Biol. 23, 24–30; 2016) that demonstrated 6mA in mammalian cells.