When you meet someone face-to-face for the first time, how you are judged is based on non-verbal data---your appearance and your body language. I know that people say: don't judge a book by its cover, but the reality is that most people do. Unless you are aware of another person's culture, you can also create a bad impression unintentionally, for example standing too close or avoiding looking at a person's face when you are speaking.

A happy smile. :) Nothing says it like a smile.

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