The study found that the cotton cloth masks filtered out up to 23 per cent of the smallest particle size of 0.3 microns on which the virus can travel.
from Top World News- News18.com https://ift.tt/3AePz1H
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सेमी-हाई स्पीड वंदे भारत ट्रेनों की बड़ी सफलता के बाद रेल मंत्री अश्विनी वैष्णव ने कहा कि पहली वंदे भारत स्लीपर ट्रेनसेट पर काम तेजी से आगे ...
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