• In “A new chimp on the block” (30 July, p 13), we published a map that showed a partially incorrect distribution for P. t. schweinfurthii. The small north-eastern area shaded light brown is in fact a forest area in Ethiopia, a country in which chimpanzees are not found.
• In “Spellbound” (30 July, p 32), the correct page number for the reference to the study in which mediums were tested under controlled conditions is p 215. Ciaran O’Keeffe was the co-author.
• Due to confusion during editing, the line, “The voltage of the country’s national grid fluctuates at around 50 hertz” appeared in our story about smart fridges (30 July, p 24). It was intended to read “the frequency of the country’s national grid hovers around 50 hertz”.
• A zeptogram or zeppogram is 10-21 grams, and is thus one thousandth of “a billionth of a billionth of a gram”, or 1000 times smaller than we stated in our article on detecting terrorists’ explosives (16 July, p 10).
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