I mean the first 'Back to the Future' is kind of a perfect script I think in terms of handling time travel the best. It depends on your definition. To me that means it effectively uses it in the story.

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I think there ought to be a strict separation or wall built between our religious faith and our practice of political authority in office. I don't think the President of the United States should extoll Christianity if he happens to be a Christian at the expense of Judaism Islam or other faiths.