Shhh….can you hear it? That strange, inexplicable hum? Since the 1970s, low-frequency rumbles have been reportedly heard around the world — spawning numerous conspiracy theories about the source.
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A spinal micro-implant that helps paralysis patients regain motor functions. A coal processing plant now serving as a solar power facility. A liquid polymer that can move and grab objects. These are five of the most talked about engineering and geoscience stories of 2019.
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