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Why Do Electrical Plugs Have Holes in the Prongs? | Simple Things Surprising Histories Electrical plugs are everyday items that hide a fascinating, century-old secret. In this video, we explain why electrical plugs have holes in the prongs step by step using real history and verified engineering facts. This documentary-style episode from Simple Things Surprising Histories covers the complete history of the electrical plug, from early 1900s inventions to the hidden manufacturing and safety purposes of modern wall outlets. Topics covered in this video: • What standard North American electrical plugs look like • How early 1900s homes were wired before wall outlets existed • Harvey Hubbell's invention of the first detachable electrical plug • The original "bump and hole" locking mechanism from 1913 • How modern wall outlets work using friction and pressure plates • Why manufacturers still put holes in the metal prongs today • How prong holes assist in factory injection molding • The life-saving safety feature of "lockout-tagout" mechanisms Chapters: 00:00 - Intro: The Hidden Detail 01:03 - Chapter 1: The Bumpy History 02:15 - Chapter 2: The Modern Outlet Illusion 03:08 - Chapter 3: The Secret Second Life 04:08 - Outro: The Final Takeaway This video is designed for students, educators, and general audiences who want a clear explanation of everyday engineering without unnecessary complexity. All explanations are factual, educational, and suitable for learning purposes. If you are searching for: why do plugs have holes in the prongs, electrical plug holes explained, Harvey Hubbell invention, how electrical outlets work, history of the electrical plug, lockout tagout safety, everyday mysteries explained, or engineering secrets, this video provides a complete and accurate overview. #EverydayMysteries #HowItsMade #EngineeringFacts #ScienceExplained #ElectricalEngineering #HistoryFacts #EducationalDocumentary #scienceexplained #sciencefacts #sciencedocumentary #simplethings #simplethingssurprisinghistories

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