The ball on top of a flagpole is called a 'truck'.
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Scientists in China have built a prototype high-speed maglev train that is theoretically capable of reaching speeds of up to 1,800 mph (2,900 km/h).
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The blueprint for a floating city has just been approved by the largest port construction and design company in China. It's entirely self-sustainable, and extends underwater.
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The United States produces enough plastic film annually to cover the entire state of Texas.
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Jumbo jets use 4,000 gallons of fuel to take off.
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If a car is travelling at 55 miles per hour it will travel 56 feet before the driver can shift his foot from the accelerator to the brake.
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