Two events made September 1 a memorable day for Jesse Cullum. First, he lost a pair of Oakley sunglasses. Second, he saved the life of President Ulysses S. Grant. Its the near future, and the technology exists to open doorways into the past - but not our past, not exactly. Each past is effectively an alternative world, identical to ours but only up to the date on which we access it. And a given past can be reached only once. After a passageway is open, its the only road to that particular past once closed, it cant be reopened. A passageway has been opened to a version of late nineteenth century Ohio. Its been in operation for most