Here’s a cool thing. When you’re sick, or allergic, or something flies up your nose, and you spasm and expel mucus, it’s polite for anyone around you, including complete strangers, to call attention to it. In English-speaking countries they say “Bless you,” in most of Europe they say “Health.” In almost every culture, …
Source: LifeHacker – Let’s All Stop Saying Bless You