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Vivien He researched, designed, built, and tested the device over the summer. The device was roughly $100. (Photo from Vivien He)   When an earthquake occurs, having even just a few seconds of warning can make a big difference. A heads-up gives people a chance to protect themselves. This is what ShakeAlert, an earthquake early warning system, aims to do. But the system is expensive and very consumer-friendly. Recently, a high school junior built a cheaper solution using parts that totaled ...

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