Woah. The premise of Quantum leap doesn't make any sense. A dude travels back in time to fix what went wrong in the past. But since it was in the past, wouldn't it have already have happened, and thus be already "fixed"? Therefore negating the purpose of time travel in the first place? And if he did do these things, wouldn't he be creating history, (and it would already have been documented anyhow)? The end result is that he traveled back in time to do whatever, but since whatever was already done, he didn't travel back into time to fix it. Time Travel is the Schrodinger's cat paradox of the Sci-Fi world.