• The research into the effects of railway privatisation in the UK was published in volume 60 of Social Psychology Quarterly, p 355, not volume 63 (22 August, p 40).
• The feature on other dimensions included a quote from Roger Penrose (29 August, p 34). The words are indeed Penrose’s but the book Gravitation in which they appeared was not written by him, as we stated, but by Charles W. Misner, Kip S. Thorne and John Archibald Wheeler.
