Why Do Beer Bottle Caps Have Exactly 21 Ridges?

Have you ever noticed that beer bottle caps always seem to have the same number of ridges? In this episode of History of Simple Things, we uncover the fascinating story behind the humble crown cap and why the standard beer bottle cap has exactly 21 ridges. From the invention that revolutionized bottled beverages to the engineering decisions that shaped modern manufacturing, you'll discover how a seemingly insignificant design detail became a worldwide standard. Timestamps: 0:03 - Intro 1:03 - The Need for a Better Bottle Seal 2:05 - The Invention of the Crown Cap 3:03 - What the Ridges Actually Do 4:02 - Why There Are Exactly 21 Ridges 5:03 - The Power of Standardization 6:01 - More Than Just a Bottle Cap 6:56 - Conclusion #historyofsimplethings #beerbottle #caps #engineering #industrialdesign #manufacturing #everydayobjects #history #design #howitsmade #didyouknow #bottlecap Medium Rock by Audionautix is licensed under a Creative Commons Attribution 4.0 license. https://creativecommons.org/licenses/by/4.0/