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How did ancient Persians manage to preserve ice in the desert heat without modern technology?

The Icehouse of Abarkouh in Yazd Province, Iran, provides a fascinating answer to this question. This conical structure, known as a Yakhchāl, employed innovative methods to store ice through the sweltering summer months. During winter nights, shallow ponds would freeze, and the ice was transferred into the icehouse's thick mud-brick walls, designed for insulation. The structure’s tall, narrow top allowed hot air to escape, while natural airflow provided cooling. Its underground storage further stabilized the temperature, ensuring

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