"It has crossed my mind. But if I did such a thing, there's no telling what setting thing's right might do. I would change so very much. I mean to say, your parents might never have married, you might never have been born, Voldemort might have been vanquished, but there's no guarantee that another Dark wizard wouldn't have risen to take his place.

Time is not something to muck about with, even for the best of reasons.

Oh, and as for number three, thanks. That means a lot coming from you, Auror."