Whether or not masks are effective in fighting corona infection is described here.

It's also clear that you can't think of being infected or not as a "0" and a "1", as described here.

But whatever the effect, it is true that "masks" have become a kind of etiquette.

And the "mask" is the first step of steps in so-called "corona literacy".

For me, I would like to suggest that in addition to this mask, the COCOA (new corona contact verification app) be included in this etiquette.

I've already written a lot about COCOA, so please refer to it.

Installing COCOA is a personal choice, but I would recommend that you install it.

It's not so much "full security" as it is "not at all worth the cost to hack.

I believe you can determine a person's "corona literacy" by whether or not they have/don't have implement a "COCOA installation".

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There are many ways to do this, but the easiest way is to ask a question,

"Have you installed COCOA?

If the person says "of course", I think his/her literacy level is "1".

"Oh, COCOA. But I'm worried about personal information...", I think it's safe to say that he/she have a literacy level of "0.9".

In comparison to,

If the person says "COCOA? What's that?", I think his/her literacy level is "0".

If you're a so-called "self-restraint police" and you don't know COCOA, I will hit you absolutely.

In addition, I will shout "Do not be silly!" loudly,

(To be continued)