But you are using one of the greatest inventions ever made. The light bulb led to new energy breakthroughs — from power plants and electric transmission lines to home appliances and electric motors.

Even though phones nowadays are significantly more sophisticated, it's unlikely that Bell would recognize his groundbreaking invention in its current incarnation. 6. The Light Bulb The light bulb ...

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In 1877, after Edison invented the phonograph, Johnson took the machine on tour, charging crowds to drum up excitement. When Edison patented the light bulb in 1880, its exact value was hard to ...