I am an international student who comes from Macau, where people usually don't know where it is. Whenever people don't know where it is, I will tell them that it is near Hong Kong. It is a very small city and is known as the little Las Vegas of Asia. Our living environment is surrounded by many casinos. I used to dislike Macau because it's so crowded. There are many visitors from all over the world, especially from China which visits every day. However, when I went to study abroad in the United States, I changed my mind. I think Macau can describe me easily. For example, it's a small city and I'm a tiny person compared to an American. People who don't like casino will think why should I go to visit Macau, there is nothing around. It's just that I took an English writing course. We were randomly divided into groups of 4. In my group we have two Vietnamese American girls, a white guy and a Chinese guy, which is me. At first I was afraid that the situation would repeat itself. I knew I already had some prejudices about people from previous experiences. Fortunately, their attitude made me feel respectful and comfortable and we shared many experiences. We had to prepare a presentation for the class. We perfectly define the idea of ​​“superadditivity” when our result is 1+1=3, by Scott E. Page from “Making the Difference: Applying a Logic of Diversity.” I'm not good at English, but I have different thoughts. I told her and one of the Vietnamese American girls would help me turn it into a full version. The other Vietnamese American girl is good at creating PowerPoint, so she made it and it looks very beautiful. The white guy who can give interesting speeches was responsible for presenting our ideas. In the process of work, we were very happy and in harmony. This was the first time in the United States, I had the feeling of working in a team. If we didn't have each other, the presentation might not be so perfect. It has been a valuable experience in my life that teaches me to work with others who do not have the same cultures, backgrounds and knowledge. I also learned that while my ability is important, the power of the mind. After that lesson, I took another lesson that also required doing some group work. We were 5 people, an American girl, an American boy, a Vietnamese girl and two Chinese, including me. The American boy rarely showed up to class. However, when he arrived, the American girl spoke to him with joy. When we had group discussions, she would just listen and agree with what he said. When we three Asians tried to express our opinions, she would just nod and never think about our opinion. It was so obvious to notice because when it was our turn to tell the class what we had found, she only used her own ideas every time. The most relevant reason that can explain her attitude was that she was biased and liked working with someone who had a similar background to hers, which is favoritism within the group. On the other hand, I had benefited from favoritism within the group. I went to a Chinese restaurant with my friend. The owner is also Chinese and gives us a discount during some Chinese holidays. It was so nice to have people in the US taking care of us. In-group favoritism can be helpful but it can also be harmful. After class discussion and my experience, I recognize that I should avoid in-group favoritism in my future life or