Meg Urry's book review 'Myth of the missing mothers' (Nature 458, 150–151; 2009) incorrectly referred to two contributors as the daughters of editor Emily Monosson. They are the daughters of Anne Douglass, a scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
Mark Buchanan's book review 'Bringing clarity to complexity' (Nature 458, 411; 2009) incorrectly referred to “the late Jim Crutchfield”, who is still very much alive.
Our sincere apologies to all concerned.
The online version of the original article can be found at 10.1038/458150a