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The latter were placed on different high points along the wall so they could be clearly seen.

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Today tourists can visit some parts of the wall that were renovated by the Chinese government.

The first magnetic compass was invented in China probably during the Qin dynasty (221-206 BC).

During the Ming Dynasty (from 368 to 1644), people started using bricks in a lot of areas of the wall. The Great Wall extends from Shanhaiguan located in the east, to Lop Lake found in the west.

It roughly defines the southern edge of Inner Mongolia.

The Silk Road helped the Chinese to trade their valuable silk fabric to other nations.

Japan was able to obtain the secrets of raising silkworms and silk manufacturing in the 3rd century.A Chinese legend says that the first silk thread was created when a cocoon accidentally fell into the hot tea of Si-Ling-Chi, a Chinese Empress and the wife of Emperor Huang-ti. she managed to come up with the way of using silk in weaving.She found that the threads of the cocoon were uncoiling and decided later to experiment with silkworms. Silk turned out to be very important to the economy of China and people kept its secret for thousands of years and the Great Wall of China helped them to do so.Chinese were able to develop technologies that required knowledge in numerous fields including mechanics, hydraulics, mathematics, horology, astronomy, agriculture, engineering, craftsmanship, nautics, and warfare.Find out which inventions created in ancient China are considered to be some of the most important.Lodestone, a naturally magnetized mineral composed of iron oxide, was initially used by fortune tellers in ancient China to make their fortune telling boards.

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