What Causes a ‘Wrinkle’ in Paper Money?

Paper money gets wrinkled because it’s touched by a lot of people. Every time someone holds, folds, or drops the money, it changes shape, like when you crumple up a piece of paper and then flatten it again. Over time, those little changes become big wrinkles.

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Examples

  1. A dollar bill gets wrinkled when a kid folds it to put in their lunch box.
  2. Your favorite $20 bill has wrinkles from being used at the grocery store every week.
  3. When you drop your wallet on the floor, money inside gets crumpled.

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