Claim:
"A face mask protects others but not yourself."
Let's make a simple experiment:
Hold a handkerchief (or a bandanna or a T-Shirt or ...) in front of your face.
Then breathe out.
The handkerchief will move away from your face.
Then breathe in.
The handkerchief will move near your face.
Conclusion:
While breathing in a higher percentage of air will be filtered.
Of course there are other aspects to be considered.
Now a little advice:
If your face mask has two gaps on both sides of the nose put some cotton wool in these gaps.
And:
WASH YOUR HANDS!
Finally a few videos about making your own face mask:
T-Shirt
https://www.youtube.com/watch?v=pFsxId5cbnE
Paper, T-Shirt, bandanna
https://www.youtube.com/watch?v=9yP_fnr4oVY
bandanna
https://www.youtube.com/watch?v=1r2C1zGUHbU
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