Humans need to know and be able to detect when another person is lying for a world of reasons. It can be boiled down to being a necessary evolutionary-developed survival skill, because in certain instances (say if one person told another that they wouldn’t eat all the food and then did), it could cost someone their life. Of course, a lie detector machine will help, but the most valuable skill when it comes to detecting when someone is lying is recognizing the signs of lying, particularly how our language changes.
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