“In Silicon Valley, some feel anxious about the growing class divide they see around screen-time. Kirstin Stecher and her husband, who works as an engineer at Facebook, are raising their kids almost completely screen-free.

“Is this coming from a place of information — like, we know a lot about these screens,” she said. “Or is it coming from a place of privilege, that we don’t need them as badly?””

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“As those working to build products become more wary, the business of getting screens in front of kids is booming. Apple and Google compete ferociously to get products into schools and target students at an early age, when brand loyalty begins to form. Google published a case study of its work with the Hoover City, Ala., school district, saying technology equips students “with skills of the future.””

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“For a lot of kids in Antioch, those schools don’t have the resources for extracurricular activities, and their parents can’t afford nannies,” Dr. Freed said. He said the knowledge gap around tech’s danger is enormous.

–nellie bowles, “The Digital Gap Between Rich and Poor Kids Is Not What We Expected” for times