• One Soviet cosmonaut died during re-entry in the 1960s, not two as was stated in “We have a problem” (25 September, p 19). Vladimir Komarov’s parachutes failed to open on 24 April 1967.
• The authors whose manuscripts we mentioned being housed in the Duchess Anna Amalia Library in Weimar were Johann Wolfgang Goethe and Friedrich Schiller (18 September, p 5).
