did-you-kno: Ancient Persian engineers made their own freezers that kept ice cold - even during desert summers. By 400 BCE, they had perfected the ‘yakhchal,’ which are made of thick, heat-resistant materials. They had vents to funnel breezes

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did-you-kno: Ancient Persian engineers made their own freezers that kept ice cold - even during desert summers. By 400 BCE, they had perfected the ‘yakhchal,’ which are made of thick, heat-resistant materials. They had vents to funnel breezes

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