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Plastic water pipes may be cheaper, but they also come with risks. Mark Bernard/iStock/Getty Images Plus

Lead water pipes created a health disaster in Flint, but replacing them with cheaper plastic − as some cities are doing − carries hidden costs

Durability and the risk of chemicals being released when pipes heat up are just 2 concerns about plastic pipes.
Philadelphia’s public high schools face a trade-off between emphasizing academic and technical skills. Hill Street Studios/DigitalVision Collection via Getty Images

Most Philly public school students have college ambitions − but their level of preparation depends on which high school they attend

A sociologist and former high school math teacher found that Philadelphia students face starkly different expectations for college depending on what type of school they attend.