What Is a Bailey Bridge?
A Bailey bridge is a type of pre-fabricated truss bridge designed by Sir Donald Bailey, an Englishman, during the Second World War. It is co
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Checkerboard Grid
The six sections below are parts of a 5 x 5 checkerboard grid. Can you piece them back together to form the original pattern?
What Is Hydropolis?
What Is Hydropolis? The Hydropolis Underwater Hotel and Resort is a proposed underwater hotel in Dubai, designed by Prof. Roland Dieterle in
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 to be
How Do We Hear Sounds?
How Do We Hear Sounds? When sounds are made, they set up movements in the air. These movements are called sound waves. The cup-like shape of