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History of the Great Wall of China


The construction of the Great Wall of China dates back to the third century BC, and many of the fortresses in the wall date back hundreds of years. Before that, China was divided into a number of kingdoms during the Warring States Period. Around 220 BC. Qin Shi Huang, the first king of the United China, ordered the removal of ancient fortresses, the merging of ancient fences along the northern border and the construction of a single wall of more than 5,000 kilometers to protect China from attacks from the north.

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The largest crocodile species in the world

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What is the light

Visible light is part of the electromagnetic spectrum extending from 700 nm wavelength, up to 400 nm wavelength, in other words visible light is a part of the electromagnetic wave that is generated and has all wavelengths. There are many attempts to measure the speed of light throughout history. It is logical and logical to think of the law of speed, which states that it is equal to distance divided by time, but with light, it is not that simple, it is very fast, Which is equal to (299,792,458 m / s).
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The most beautiful areas in Qatar

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