Mask inventor Peter Tsai puts retirement on hold to help ease N95 shortage in the US

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Taiwanese-American scientist Peter Tsai has put his retirement plans on hold, saying he could no longer sit back and watch as medical workers reuse masks and protective equipment while they help coronavirus patients. More than 30 years ago, the scientist came up with a filtration method that helps N95 masks block 95 per cent of all particles. Now, Tsai is working with virologists and the medical industry to develop a way to improve the N95, so the respirators can be safely sterilised and reused.

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