People say that there's an “epidemic” in the works, but not the infectious disease kind. Instead, it’s swarms of preteens flooding Sephora stores across the country, ravaging makeup and skincare ...

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Listen to more stories on the Noa app. At least once a month, someone asks Kathryn Keough, a clinical psychologist at the mental-health nonprofit Child Mind Institute, if their child is in trouble. An ...