• In the News & Views article “Quantum chemistry: The little molecules that could” by Cris H. Greene (Nature 458, 975–976; 2009), the equivalent for 1 millikelvin should have been given as 100 billionths of an electronvolt, not 4 billionths.

• In one of the obituary articles about John Maddox, “Maddox by his successor” by Philip Campbell (Nature 458, 985–986; 2009), Nietzsche was misspelled.