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Refugee Fuce Drying Food: Peruvian Inca

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Surprisingly, freeze drying food has been around since 1250 BC where Peruvian Incas used a primitive form of freeze drying in order to preserve food. Placing food on high elevation tables or platforms, potatoes and meat were frozen over night and then dried in the hot sun. During the two World Wars, machines were developed in order to dry foods, including coffee for the first time. NASA further developed the technique as a means to feed astronauts on extended space missions. The process of freeze drying consists of first freezing the food solid. Using a low heat vacuum chamber, the frozen water crystals evaporate from ice to water vapor, in a process called sublimation. The second drying, under slightly higher heat, removes any remaining
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