• A conversion error made as our feature about cockroaches (16 April, p 40) was being prepared for publication led to the radiation doses we quoted being out by four orders of magnitude. The correct figures are 64 grays for cockroaches, 640 grays for fruit flies and 1800 grays for Habrobracon wasps.
• The story headlined “Invisible princess keeps kids honest” (23 April, p 18) should have said 67 children were involved in the study reported on.
