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A stone tool is, in the most general sense, any tool made either partially or entirely out of stone.
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In its primitive form, a wheel is a circular block of a hard and durable material
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water pump is any device for moving water
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Paper is a thin sheet material produced by mechanically and/or chemically processing cellulose fibres derived from wood
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A clock is a device used to measure, keep, and indicate time
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Is an instrument used to see objects that are too small to be seen by the naked eye
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Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge.
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An electric motor is an electrical machine that converts electrical energy into mechanical energy
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cement is a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together
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was a gadget to talk into distance
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Dynamite is an explosive made of nitroglycerin and stabilizers.
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Radio is the technology of signaling and communicating using radio waves.
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is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to the mechanical compression
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Cinematography, the art of motion-picture photography
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A nuclear reactor, formerly known as an atomic pile, is a device used to initiate and control a self-sustained nuclear chain reaction
