Bifalgorithm post

How did ancient Persians keep ice frozen all summer in desert temperatures over 100 degrees Fahrenheit? Storing ice in the desert should be impossible since heat melts ice within hours. But Persians built massive domed structures called "Yakchaws" that kept ice solid for months in scorching heat. These ice houses had walls over six feet thick made from sand, clay, egg whites, lime, goat hair, and ash. This mixture created insulation better than modern materials. The dome shape reflected heat away and underground ice pit stayed naturally cool. In winter, Persians flooded shallow pools at night when temperatures dropped below freezing. By morning, they'd harvest sheets of ice and store them in underground chambers. The thick walls and dome design kept temperatures low enough to prevent melting. Some Yakhchals could store over 5,000 cubic meters of ice, enough to supply entire cities throughout brutal summer months. These ice houses were so effective that many are still standing in Iran today.

How did ancient Persians keep ice frozen all summer in desert temperatures over 100 degrees Fahrenheit? Storing ice in the desert should be impossible since he…