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Seeking science, why are the five Nordic countries and Luxembourg, Switzerland so rich?

Luxembourg is located in the northwest of Europe, surrounded by neighboring countries, such as France, Germany and Belgium. It is a small landlocked country, the size of which is equivalent to a county in China.

It is also the only remaining grand duchy in continental Europe, the capital Luxembourg [1]. Luxembourg is a member of the European Union. Because there are many dutiful castles in China, it is also called "pocket kingdom" and "country of thousands of castles" [2]. Because of its rich terrain