I had nightmare moment last night. What if it’s this website that has changed history? What if the very fact of my having reported my presence here, in public, together with the small amount of information I’ve given about the project, has somehow changed things? But surely any changes could only be to the future – not the past? Or is time/the universe/whatever like a pool, and the ripples from the stone I’ve dropped in have gone not only forwards but also backwards, to change the past? I’m not sure if I need to be a physicist, or a philosopher to answer that.