[wmspringer]

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i think you may be grasping what i am trying to say. say time travel is created at time ( X ). It would make sense that we would not be able to travel to anytime prior to ( X ), but would be able to travel freely anytime after ( X ). Although the airport analogy may not be the best to use in this situation, i think it gets the general idea across. how about, you cant listen to a cd without a cd player.

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I think you're trying to say that you feel time travel should require a reciever rather than just a transmitter :-)