Which kind of mask is best?
BBC, 02 Feb 2021
There are so many different kinds of face coverings, that it can be hard to know which is most effective.
The BBC's science editor David Shukman has examined the pros and cons of different mask designs.
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The BBC's science editor David Shukman has examined the pros and cons of different mask designs.
Please subscribe HERE http://bit.ly/1rbfUog
#BBCNews
