• Thanks to the many learned readers who reminded us that “octopi” (5 October, p 10) could not possibly be the correct plural of “octopus” as it is derived from Greek. But we got it right when we referred to octopuses the following week (12 October, p 24).
• In “Sea lion scores top marks in memory test” (26 October, p 25) we reported that “sea lions may have the best memory of all non-human creatures”. We should add that, as yet, no other animal has been tested for this length of time.
• In “Who are we?” (26 October, p 44) we stated that there were no volcanoes to provide ash for carbon dating. That should have read radiometric dating.
• The picture of Titan with “Titan probe could find a world of weirdness” (19 October, p 25) should have been credited to Mark Robertson-Tessi of the Arizona Space Grant program, working in collaboration with Ralph Lorenz, who emphasises that because of its thick atmosphere, Titan would appear dark red, not blue as shown.
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