What is the science behind face coverings?

There has been limited research on the efficacy of cloth face coverings in preventing spread of COVID-19, but studies have shown that well-made face coverings that fit snugly against the wearer’s chin and face, have multiple layers, and do not impede the wearer’s ability to breathe may reduce the transmission of large respiratory droplets. Learn more about the science behind face coverings here. 

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1. Is there a difference between "cloth" and "fabric" face coverings?
2. What is a cloth face covering?
3. What is the science behind face coverings?
4. Can a business owner require masks upon entry?
5. When is a face covering not needed?
6. Can I wear a face shield instead of a mask?
7. If I have a medical exemption from wearing a mask I can work at my job without one, right?
8. Is anyone exempt from wearing a face covering?
9. Can I use an N95 respirator or surgical mask instead?