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His explanation was impossible to understand.

I am very interested in social science.

Statistical mechanics is a branch of physics that provides a theoretical framework for understanding macroscopic phenomena from a microscopic perspective.

He is majoring in statistics.

Demography is a branch of social science that studies the structure, distribution, and changes in human population.

The next census will be conducted next year.

Tokyo is the city with the highest population density in Japan.

Looking at the population pyramid, you can see that this country is aging.