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Earlier quoted context omitted.
>smiling a universal human thing that worked everywhere as a sign of friendliness Smiling is always a sign of friendliness. It's just that some places you cannot expect to smile at nothing and will end up looking silly. In those places even small talk is frowned upon unless you really want to be their friends. The author missed the most important part in this: In these countries you cannot be friendly and not be frie…
He's probably thinking about Bulgaria, which is famous for this.