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Additionally, children could contribute labor to the raising of crops more readily than they could to the hunter-gatherer economy. The discovery and use of fire, a simple energy source with many profound uses, 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 value and broadening the number of foods that could be eaten. The distinction between science, engineering, and technology is not always clear. If You Have 'an Idea To Change History' You Can Earn Up To 250 Thousand Pesos In This Initiative Of History Channel Since technology can be so simple or so complex, there are many types of technology. One type is mechanical technology, which includes wheels, cams, levers, gears, belts, and engines. Things that turn, or allow motion in one direction to cause a different kind of motion, are mechanical. The wheel is probably one of the m