The first version of the mask is for normal people in daily use. — Photo courtesy of Metran
HANOI (Vietnam News/ANN): Face masks have become an inseparable part of our daily life amid the Covid-19 pandemic, but many wearers wish they didn't feel so stuffy while protecting their health.
A Vietnamese scientist living in Japan has invented an air-purifying face mask that kills bacteria and viruses, while creating a flow of cool, fresh air for wearers.
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