Are Face Masks Effective?

I just read an article on face masks. It's basic and totally makes sense. As masks have been mandated in Guatemala starting on Monday, this is good info.

Even if you don't have a "professional mask", the article says

When speaking while unmasked, thousands of droplets were produced. In one 16.6 millisecond snapshot alone, the lasers detected 360 droplets. This translates to 21,600 droplets in just a second of speaking and over a million particles when talking for a minute.

However, when the speaker’s mouth was covered with the damp cloth, the visible droplets were reduced to zero.