• Our leader on the human microbiome suffered a terminological failure. The idea that TB might have helped us evolve large brains is only a hypothesis (21 June, p 5).
• Ali Maalin was the last person to catch smallpox naturally (14 June, p 38), however the final cases occurred in a lab accident in 1978.
• A slip of the tongue: the closing remark in our article on the space-borne X-ray machine should have been attributed to Rich Boling (21 June, p 14).
• A case of mistaken identity: the gorillas of Virunga National Park are the Eastern lowland subspecies (24 May, p 12).
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