• Our description of the Hampshire tree planning test (30 October, p 43) failed to make it clear that you can only move a number on or off the end of a branch of the tree, and cannot slide one over another.
• We said: “Each year, 75 million babies are born” (6 November, p 32). That is the increase in population; the number of babies born is .
• The skinks whose sex-determination Ido Pen and colleagues studied (30 October, p 18) was Niveoscincus ocellatus, not N. greeni.
• The correct DOI for the paper in Biological Psychiatry we mention in the article “Sins of the fathers” (6 November, p 8) is .
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