There's also the Observer Paradox. Someone theorised that if time travel had been invented in the future, all sorts of famous events would be surrounded by massive crowds from the future watching them. Since history doesn't record hordes of gawking tourists from the Tuscaloose of 3050 watching Lincoln get shot, it's a safe bet nobody Up The Line invented time travel.
Take that as you will.
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The first run through of any experimental procedure is to identify any potential errors by making them.
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