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A zipper has tiny teeth that lock together to close it.

A zipper has tiny teeth that lock together to close it.

When you slide the zipper up, the little teeth link up like a hug. Slide it down and they let go.

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Buttons slip through little holes to hold clothes closed. Buttons slip through little holes to hold clothes closed. We tie shoelaces into a bow to keep our shoes on snug. We tie shoelaces into a bow to keep our shoes on snug. Velcro has tiny hooks and loops that stick together. Velcro has tiny hooks and loops that stick together. Getting dressed by yourself is a skill you grow into. Getting dressed by yourself is a skill you grow into. The zipper was invented more than 100 years ago. The zipper was invented more than 100 years ago.