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Other technological advances made in the course of the Paleolithic era have been clothes and shelter; the adoption of each technologies cannot be dated precisely, but they had been a key to humanity's progress. As the Paleolithic era progressed, dwellings turned extra subtle and more elaborate; as early as 380 ka, people have been developing short-term wood huts. Clothing, adapted from the fur and hides of hunted animals, helped humanity expand into colder areas; humans began to migrateout of Africa by 200 ka and into different continents similar to Eurasia. The discovery and use of fire, a simple power source with many profound makes use of, was a turning point in the technological evolution of humankind. Fire, fueled with wood and charcoal, allowed early humans to cook their food to increase its digestibility, improving its nutrient worth and broadening the number of meals that could probably be eaten. In a pre-industrial society, meals production, which is carried out by way ...