• Marcus Chown’s review of The Coming Convergence (12 April, p 46) described author Stanley Schmidt as “former editor” of the science-fiction magazine Analog. Actually, he is still the editor. Sorry.
• Our article on an asthma drug that can restore the sense of smell (12 April, p 15) described cAMP and cGMP as proteins. They are, in fact, nucleotides.
• David Wengrow’s research on branded goods in Mesopotamia (26 April, p 10) is reported in Current Anthropology, vol 49, p 7, not, as we said, Current Archaeology.
