This DIY air purifier costs far less than a HEPA purifier, and studies say it works

The Corsi-Rosenthal Box is a DIY air purifier. Some are making theirs kid-friendly by adding unique design elements, while others are getting creative in how to transport them from office to class. (left: @roofeo24 on Twitter, right: James Andrew Smith) The Corsi-Rosenthal Box is a DIY air purifier. Some are making theirs kid-friendly by adding unique design elements, while others are getting creative in how to transport them from office to class. (left: @roofeo24 on Twitter, right: James Andrew Smith)

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Protests of strict COVID-19 lockdown measures hit Shanghai, Beijing

Protests against China's strict 'zero-COVID' policies resurfaced in Shanghai and Beijing on Sunday afternoon, continuing a round of demonstrations that have spread across the country since a deadly apartment fire in the northwestern city of Urumqi led to questions over such rigid anti-virus measures.

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