About ten years ago I wrote to The Guardian's 'Notes & Queries', asking the question "Has anyone seriously investigated time travel?" I got two replies, one explaining how it is, in all probability, technically possible but definitely not recommended, and another wag who replied with something like "Is time travel possible? Of course it is. Margaret Thatcher took Britain back to the Victorian Age and Curtis LeMay bombed North Vietnam back to the Stone Age." There is now an autobiography, The Time Traveller by Ronald Mallett, who has spent his life trying to build a time machine so he could go back and see his late father again. Story here.
