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[–] Reow [S] ago 

My guess is that the biggest impacts it would have are on crime and history. As far as crimes go, investigations would be simplified significantly and courts would no longer need to rely on witness testimony. Meanwhile, criminals would have incentive to ensure crimes were committed in inaccessible locations, and disguises were used even when there were no witnesses. Many past mysteries would be cleared up, and I'm guessing a considerable number of convictions would be overturned.

As far as history goes, historians could determine with near complete accuracy what transpired in the past. This would be revolutionary for the field - competing hypotheses could be easily tested, myths could be established or rejected with certainty, dead languages could be revived, and so forth.