What would it be?
Time travel is something man wish he could achieve. Kinda like being able to fly like a bird. However unless there's some crazy DNA mix up at a science lab, man as we know him will never be born with wings. As far as time travel, we can always dream about the past or imagine going back in time.
With that said, if you could change one event in time, what event would it be. It can be a personal or world event.