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By Jessica Grose

Opinion Writer

An app nearly prevented me from picking up my own child this week. My younger daughter’s day camp has a convoluted, high-tech authorization system. Before camp started, I needed to log into its website, download an auto-generated code and activate it. When I meet the bus, I type my code into a counselor’s phone.

In the best of circumstances, this is an extra — and to me, unnecessary — step. As Let Grow, a nonprofit supporting........

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