time travel
is it theoretically possible to travel through time? absolutely. but only forwards. not backwards. we are all travelling through time right now. at pretty much the same rate. so to disappear from the now and show up in the future without aging, all you have to do is travel around at nearly the speed of light. simple no? ender did it in speaker for the dead. completely plausible. however, hollywood excepted, there's no way to go the other way. sorry.