If it were possibleit hasn't been invented in this universe yet, so no-one could have come back.
If someone did invent it and go back in time, they'd alter all the events in that universe starting from the time they went back to and turn it into a different universe; they'd then be pretty screwed, because they might not have a future to go back to (given that the events of the universe after their visit were different.)
(If someone did invent it and go back in time, they'd alter all the events in that universe starting from the time they went back to and turn it into a different universe; they'd then be pretty screwed, because they might not have a future to go back to (given that the events of the universe after their visit were different.)
The Mock TurtIe ™ --- Thinks you are a cunt, on,
Wed 16 Nov 2005, 19:14,
archived)