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airplane Ancient Ancient Greece animals barrel became bits blades blast furnace boat bone burned called camera cars change the world chemical Christiaan Huygens clocks cylinder designed Diesel discs drill early Earth Edison electric motors electrical signals electronic Europe explosion farm faster filament fire fuel fusion power gases groove gunpowder guns Gutenberg heat hole Homo erectus Homo habilis hydrogen idea ink feed inside invented inventors iron jet engine launch lens lenses light bulb lives machine magnet maps metal Microchips MICROSCOPE Middle East million years ago modern Moon nuclear NUCLEAR FUSION orbit piano pieces piston planes plow printing propellers pull push radio waves recording roads rock Roman Rudolf Diesel sail satellite scientist screw ships soon sounds SPACE ROCKET Splice the mainbrace steam engine stone tank telephone telescopes Thomas Edison tiny toilet Valves Vinyl records wheel Whoops wire