A DIY air purifier that costs less than $100 to make is taking American classrooms by storm

At the end of last year, Shiven Taneja was someone who was looking for a solution. His community of Mississauga, Ontario, entered its fifth wave of COVID, and Omicron was a terrifying, fast-spreading variant, but rapid testing was scarce and the availability of booster shots severely limited. He wanted a way to reduce the risk. …

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