• The UK Committee on Medical Aspects of Radiation in the Environment found no excess cancers within 25 kilometres of nuclear plants. Because of an editing mistake, our story “Nuke-plant leukaemia link?” (9 February, p 6) conveyed exactly the opposite.
• The reference for the paper by Craig Wheeler and colleagues on the shape of the Cassiopeia A supernova remnant should have been www.arxiv.org/abs/0711.3925 (26 January, p 16).
