Lint forms on organic fibers like cotton and wool through normal wear and tear. Essentially, as the clothes rub up against your skin or other surfaces, it forms lint. Then, when the clothes are washed, the water lifts the lint. Once the clothes go in the dryer and the water evaporates from the lint, it is released from the clothes. An airstream formed by the dryer pulls the lint into the screen and you get that soft, felty lint.
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