If I told someone in a parallel yep more primitive world all about computers, and even give them a laptop formatted with Linux Ubuntu, and they reverse engineer it, and then I go back to my world, and years later go back in time to before I went to the parallel world and switch the laptop with Ubuntu for a MacBook Air, with OSX, then go back to my current/future time and wait a few more years and go across to the other wold again to check up on them, which OS would they be using, Ubuntu or OSX? Keep in mind that this time line was changed, and effects the other parallel world, but in the parallel world, I did not go back in time.
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