• The “record-breaking crust” we mentioned in Greenland (22 December 2007, p 24) is 3.8 billion years old – not 1000 times younger, as we stated.
• We described Weta Digital as “giving Gollum a voice that sounded human” (27 October 2007, p 32). Gollum’s words were spoken by the human actor Andy Serkis.
