Runways, rockets and Russell's teapot | Brief letters

Stonehenge tunnel | Ants and acid | Lost from the Guardian | Yorkshire pudding | Elon MuskWould it be possible to have a free gamble on which major public work will be completed first: the Stonehenge tunnel or Heathrow's third runway (First proposals for Stonehenge's ?1.6bn road tunnel revealed, 8 February)?David ProtheroHarlington, Bedfordshireo Morwenna Ferrier (The faddy eater, G2, 8 February) ascribes the flavour of ants to "the varying levels of ascorbic acid they contain". This is incorrect. Ascorbic acid is vitamin C. What ants contain is memorably described by Ogden Nash: The ant has made itself illustrious / Through constant labouring industrious. / So what? Would you be calm and placid / If you were full of formic acid?Sebastian RobinsonGlasgow Continue reading...