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BrainStuff

HowStuffWorks

Science & Medicine, Natural Sciences, Society & Culture, Technology

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Science & Medicine 12
Natural Sciences 4

Whether the topic is popcorn or particle physics, you can count on BrainStuff to explore -- and explain -- the everyday science in the world around us.

Why do most zippers say 'YKK' on the pull-tab?

March 19th, 2010

Episode 568 of 1067 episodes

Have you ever wondered why zippers often have the letters 'YKK' etched into them? Learn more about the Japanese company behind the tiny letters -- and the zippers -- in this episode.

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