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It’s been nearly seven years since the beginning of Flint, Michigan’s water crisis, when high levels of lead from corroded lead pipes led to water shortages and health issues for city residents. Since then, many other cities around the country have had their own problems with lead. Researchers estimate that millions of Americans are living with pipes that need to be replaced. 

As Wired reported earlier this month, Toledo, Ohio is one of the latest cities trying to get ahead of its legacy of lead plumbing, with the help of an algorithm created by University of Michigan researchers. The model was originally created to help the city of Flint more quickly—and less expensively—target which homes were most likely to need their pipes replaced. 

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