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Another key part of the positive psychology literature is called "grit", which means the ability to do the work needed to reach a goal, to stick with it, to not give up. Angela Lee Duckworth, a Chinese-American psychology professor, also at the University of Pennsylvania, developed a test for grit. She found a technique called "growth mindset", which shows struggling students that they can build their mental capacities by focusing on special areas where they are having difficulties. Just letting students know that they can improve makes a big difference in their attitudes, Duckworth says.

Ankara's military operation followed US officials' statements on a planned Kurdish-led "border security force (BSF)" to be established in the future in Syria along the 900-km border with Turkey, a move that has angered Turkey.

Apartment buildings and mountains peek through the fog in Xishui county, Guizhou province, on Sunday. [Photo by Luo Jin/for chinadaily.com.cn]

Apart from Hong Kong and Shenzhen, another seven Chinese cities, all on the mainland, were also included in the top 50. New York took the top spot as the most competitive city in the world, followed by Tokyo and London.

Any hotpot restaurant is only as good as its broth. Ao Ba Nian has taken this maxim and made it a focal point by using ingredients, such as the bones from pork and chicken and wild mushrooms that are slowly simmered for more than eight hours to release every ounce of their flavors.