Peter Tsai, the inventor of the electrostatically charged filter used in face masks, has emerged from retirement to help boost filter production and reuse. Here, he’s pictured at the Oak Ridge National Laboratory in Tennessee, where he has loaned his own equipment to the filter-production line. “Even though I’m mostly working for free, I feel a responsibility to help out during the pandemic,” says Tsai. “Otherwise, I would regret it for the rest of my life.” (Nature | 3 min read)
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