What Is the Great Wall of China?
What Is the Great Wall of China? More than two thousand years ago, the Chinese emperor Qin Shih Huang Ti decided to build a huge wall to keep out his enemies. It came...
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How Does Albatross Use Dynamic Soaring Maneuvers to Fly?
How Does Albatross Use Dynamic Soaring Maneuvers to Fly? The mighty albatross can use its huge 3.5 metre wings to circumnavigate the globe in just 46 days. But its...
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How Does a Cylinder Lock and Key Work?
How Does a Cylinder Lock and Key Work? A cylinder lock is made up of a revolving metal cylinder. Five small pins fall down into the cylinder when it is locked. There...
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What Is Tombstoning?
Tombstoning is the act of jumping in a straight vertical posture into the sea or other body of water from a high jumping platform, such as a cliff. This posture of the...
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How Far Away Is the Horizon?
The distance to the horizon, the imaginary line where the sky seems to meet the earth, depends on how high our eyes are above the level of the land we are looking...
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