Desperately, we want to change our past, not to have done those awful things. We ask science to invent a way to let us go back, to give us a re-do.      Sadly, scientists tell us, time is a one-way journey, like that final walk to the electric chair. No, they say, you can’t go back and do something different; that’s impossible.      But we don’t need to visit the past, they explain, because everyone’s past changes itself. At night, in sleep, our memories gradually give us a new … [Read more...]