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Professor Zones is on a plane to Jordan, where the city of stone is located. Suddenly, the engines catch fire! The pilot is knocked unconscious – and there are no parachutes! Of course, our heroine knows how to fly – but the ignition key has fallen off. Where is the spare key?

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Interesting fact:

Did you know that beneath the city of Xi’an, China, there’s an underground army of some 8,000 terracotta soldiers? They’re protecting the tomb of China’s first emperor, Qin Shi Huang. More than 2,200 years old, the mausoleum resembles an entire underground city and covers an area of 98 square kilometres!

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