What are the surprising facts of China?

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What surprised me when I learned about China is that all popular social media are banned in China.

Besides, you can know more surprising information-

1:- Paper, compass, first invented by China

2:- 18% of the total population of the world are Chinese citizens

3:- The Great Wall of China covers an area of more than 13,000,000 miles

4:- To mention many at once,

China has the world's longest canal, high-speed railway, world's second tallest building,