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Since earthquakes are in the news recently: We needed a method of detecting vibration in equipment, so I whipped up a simple vibration detector. One day, when the equipment was off, I saw that the detector was registering quite a bit of movement, even though I could not feel anything. I heard later that there had been an earthquake a few hundred miles away. That's when I had the "a ha" moment and decided to make a Seismic detector. - http://www.instructables.com/id/Earthquake-Vibration-Sensor/
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