Passengers with face masks wait for a train at the Alexanderplatz underground station in Berlin, Germany, April 27, 2020.
Passengers with face masks wait for a train at the Alexanderplatz underground station in Berlin, Germany, April 27, 2020.

Face masks have gained worldwide importance as we battle the deadly coronavirus together. Most countries have recommended their citizens wear face masks to stem the spread of COVID-19.  But there's a right way and a wrong way to do so.  Here's what you need to know.

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