• In the News and Views in Brief item “Cell biology: Muscle mice” (Nature 422, 393; 2003), the adult stem cells referred to were derived not from human bone marrow but from synovial membrane.

• The correctly spelt name of the author whose work was discussed by Ian Stewart in “Mathematics: Regime change in meteorology” (Nature 422, 571–573; 2003) is Daan Crommelin.