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.
 Learn more about your ad-choices at https://www.iheartpodcastnetwork.com

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. Learn more about your ad-choices at https://www.iheartpodcastnetwork.com

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

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.

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

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