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Physicists from the California Institute of Technology and the University of Cambridge recorded these groans by visiting huge sand mounds in Death Valley National Park and the Mojave Desert. Looming more than 30 feet tall, these dunes experience avalanches that can last for minutes at a time. Geomechanicist Nathalie Vriend and her colleagues decided to record these avalanches using geophones, devices that measure the velocity particles being pushed by sound waves in the earth or underwater.