I just finished reading 11/22/63 which focuses on time travel however, with everything in my heart wanting to believe its possible, I (not being anything close to smart) highly doubt that you can visit a time that has already passed. It just doesnt make sense. It would be like everything that has ever happened has been "recorded" (for a lack of better words), but really, has it? I dont know. This shit blows my goddamn mind....and I dont smoke.