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A network of inexpensive seismometers, installed in people’s living rooms, gardens and workplaces across Haiti, is helping scientists to unravel the inner workings of the magnitude-7.2 earthquake that devastated the southwestern part of the Caribbean nation this month. The community-science effort launched after the country’s last major earthquake — a magnitude-7 tremor in 2010 that killed more than 100,000 people — and has since helped to reveal details about Haiti’s seismic activity.