You're missing an important point though - going back in time and showing your invention to those in the past would cause a disruption to the space time continuum and both parties would cease to exist!
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"A man's ethical behavior should be based effectually on sympathy, education and social ties and needs; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death"
- Albert Einstein
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