Eventually, the working of metals led to the discovery of alloys corresponding to bronze and brass . The discovery of fireplace was described by Charles Darwin as “possibly the greatest ever made by man”. Archeological, dietary, and social evidence level to “continuous fire-use” no much less than 1.5 Mya. Fire, fueled with wood and charcoal, allowed early people to cook their food to extend its digestibility, improving its nutrient worth and broadening the number of foods that might be eaten.

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