• Marie Curie was alive between 1867 and 1934, not 1854 and 1923 as we stated (4 July, p 23).
• Laurie Dizney and others reported their findings on the spread of infection in mice in Emerging Infectious Diseases (4 July, p 12).
• The name of the Yale University anthropologist mentioned in “The End of War” is Carol Ember, not Carolyn (4 July, p 38).
• There were two valid solutions to Enigma 1546 (4 July, p 24): 38.5 and 57.5 square centimetres. A second £15 prize has been awarded to R. F. Tindell of Great Shelford, Cambridgeshire, UK.
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