This article is very useful and reliable as it gives only facts rather than opinions and also, these information gives us many new ideas on politeness is very important for everyone such as In the United States people shake hands firmly for a few minute but in some the Middle Eastern countries, people hold the person's hand gently for a longer, and If someone invite you to dinner. Some countries, you should arrive there on time, but some other countries you should arrive there after the time of the invitation around 30 to 60 minutes.