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How to break glass with a fragment of a spark plug (Part 1)

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Uploaded on Jun 28, 2011

Mike shows how porcelain from a spark plug can break glass with ease. Then tries to do the same with a rock. Why doesn't he just use the hammer? Because this is not a video on how to break glass with a hammer. Why does he talk like a caveman? For fun and to explain it in a simple manner. No, you don't need a vise to recreate this. Why does this work? Search the comments below. Some very knowledgeable people break it down for you.

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