The Retired Inventor of N95 Masks is Back at Work, Mostly for Free, to Fight COVID-19



Peter Tsai retired two years ago, but the materials scientist says he’s never been busier. “I started working almost 20 hours a day,” he said, adding he’s doing it mostly on a volunteer basis. “But I didn’t mind.” He is so hard at work that he literally made a temporary laboratory in his house!


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Photo Credit: Jonathan J. Castellon

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