By 400 BC, Persian engineers had invented a refrigerator in the middle of the desert. Ice was imported in large quantities from the nearby mountains during the winter months and stored in Yakhchal. These are conical buildings made of a special insulating mixture of clay, goat's wool, and egg white, which prevent the penetration of daytime heat.

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By 400 BC, Persian engineers had invented a refrigerator in the middle of the desert. Ice was imported in large quantities from the nearby mountains during the winter months and stored in Yakhchal. These are conical buildings made of a special insulating mixture of clay, goat's wool, and egg white, which prevent the penetration of daytime heat.

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6.77K viewsMay 18 at 07:59