How does a ZIPPER works??

       
     A Zipper or Zip fastener is a mechanical device used for closing two open ends of fabric or any material. This small piece of engineering has a lot of applications. It is even used in Space suits and Pressure suits developed by NASA. 
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              The zipper consists two rows of teeths facing each other with a small offset. Each teeth is not placed exactly opposite to other teeth; It is misplaced by a small distance.

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