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The history of cleanliness begins hundreds and hundreds of years ago, when rudimentary hygienic practices were often associated with religious and purification rituals. In 220 B.C., Greek philosophers analysed and even questioned the reasons for cleaning. "Why clean and cleanse? To change what is not beautiful...

Confirmation bias is the cognitive phenomenon, typical of human nature, that leads us to confirm a hypothesis by means of evidence in favour of it, rather than trying to take into account evidence other than what we believe to be correct. This type of bias...