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EntertainmentAdmire the world's oldest citadel
The Erbil ancient citadel is of particular interest to historians because it is the oldest inhabited residential area in the world.The Forbidden City - China
The Unesco Scientific, Educational and Cultural Organization has recognized the Forbidden City, also known as China's Imperial Palace, as a World Cultural Heritage in 1987.
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Why are diesel engines not used in small cars?
Why does every lock have a 'mysterious' small hole at the bottom?
Why is Mount Everest so attractive to so many people?
Why will the Earth never be 'swallowed' if one day the Sun turns into a black hole?
Record selling price for the gold watch of the richest passenger on the Titanic
Humans' heat tolerance limit is not as high as we think
Atomic clocks are off by only 300 trillionths of a second every day
China wants to bring Mars samples before the US
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