Making missiles to tracking them

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South Africa’s deep diamond and gold mines use air-conditioning to allow miners to work at thousands of feet underground, which would otherwise be suffocating. Air conditioning involves every part of the US space program, from making missiles to tracking them through the atmosphere.

For many years, inventors have been repairing the air-conditioning method. The ancient Egyptians and Romans relieved the heat by hanging woven mats soaked in water at the entrances of their houses so that the air could be carried by evaporation. In the 15th century AD, famous artists and inventors built hydraulic fans.