How a nondescript box has saved lives during the pandemic, and reveals the power of grassroots innovation

One afternoon, a dozen Arizona State University students gathered to spend the morning cutting cardboard, taping fans and assembling filters in an effort to build 125 portable air purifiers for local schools. That same morning, staff members at a homeless shelter in Los Angeles were setting up 20 homemade purifiers of their own, while in Brookline, Massachusetts, another DIY air purifier was whirring quietly in the back of a day care classroom as children played.

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