This is the correct way to sneeze
“Over the past decade or so, schools and day-care centers around the country have gradually adopted the technique as a way to ward off colds, flu, whooping cough and other easily transmitted bugs. It’s been replacing the traditional cover-your-mouth-with-your-hands-or-a-tissue approach that has long been considered the polite and most sanitary technique.
The reasons are fairly obvious “” when you use your hands to block a cough or sneeze, the germs stay here. And your hands can then spread the germs to doorknobs, desks, chairs and anything else you touch.”
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I was always taught it was bad manners and rude to wipe your snot on your sleeve!
I have seen people do this a few times, and thought it was just a quirk. I didn’t realize there was a good reason for it.