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New Scientist on MSN7d
Before the Great Wall, Chinese rulers built a shallow ditchA network of trenches, walls and enclosures built across the steppes of China and Mongolia 800 years ago seems to have been ...
Various dynasties worked on the 2,485-mile-long (4,000-km) MWS, such as the Jin dynasty (1115 to 1234 CE), whose empire ...
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