Water areas occupy two-thirds of the planet's surface. Since the ancient times people have tried to overcome water obstacles and establish contact with other civilizations.
The first vehicle people dared to use for overcoming water areas was the ordinary girder. Afterward people realized that using more than one girder is safer and more convenient. A new vehicle, the ferryboat, was invented.
In the 5th century sailboats came to replace them. The first sailboat has been created in Egypt. The sailboat had a military significance for Egyptians. First it was a necessity and secondly –a luxury.
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