Why does the vending machine care which direction my dollar is facing?
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Dollar bills have multiple counterfeit protections in them. Vending machines are designed to look for those counterfeit protections and reject bills if they don’t find them. If you put your bill into the vending machine facing the wrong direction, those protection features will not be in the places that the vending machine is expecting them to be in, and it will think it’s a fake bill.
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