A visitor, Dave Kaplan, has sent me some correspondence
that he has had with Bob, the time traveler in search of a dimensional warp generator
Another visitor has pointed out that Bob is not the first time traveler to have visited us. Three years ago a guy named John Titor
made a big splash for a couple of months, before he mysteriously disappeared (he said he was returning to his own time). I guess John had a dimensional warp generator, whereas Bob doesn't.