Americans really love to greet each other even if one does not know each other. When you walk pass the stranger, it is ok to say hi or hello and you can expect to receive the greeting back with a smiley face. In Thailand, we usually do not talk to the stranger except for the rural area where people are really friendly. Moreover, American always ask like “How are you?” and even if you are really sick, you have to say “I’m fine…” cough cough…