Let's see. Fire, the wheel, the lever, cooked food, houses, clothes, domesticated plants, domesticated animals, boats, the saddle, the windmill, aqueducts, engineering, multistory buildings, running water, the steam engine, the internal combustion engine, geology, chemistry, elements, electricity, the telegraph, the telephone, the integrated circuit, the computer, biology, evolution, airplanes, the jet engine, the rocket, space flight, medicine, philosophy, money, economics, the division of labor, and labor saving devices of all kinds