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Fakes, pranks, bluffs, deceptions, plagiarism, placebos... Throughout history, humanity has told so many lies that sometimes it is doubtful whether it has ever told the truth! Lies are discussed in scientific studies and articles, poems and novels. So what is a lie? Why does everyone lie? And does everyone really lie? Is lying always bad? And what does it lead to? Are liars always exposed? And how is it done?