: This is where we run into a problem... If the Jjarro change their own history
: enough, they can (and most likely would) cease to exist due to simple laws
: of paradox (ya cant kill your gramps as a kid and still expect to be born
: now can ya?) So, they vanish. But, if they vanish, the changes they made
: vanish, and they come back. Endless cycle, and sucks much... So, they are
: never allowed to make enough of a change to cause them to cease to exist,
: and gradually lost ALL ability to affect the universe around them. So,
: they get bored and move on, to somewhere that that could still act.
...This is one of the best arguments *against* time travel. More evidence it can't be done.