Nikola Tesla needed ambient electricity to make his wireless inventions work. So he created the Tesla coil.
At the 1893 Columbian Exposition in Chicago, 160,000 light bulbs lit up the evening sky over Chicago.
In Nikola Tesla's original contract with George Westinghouse, the inventor was promised a bonus of $2.50 for every horsepower of alternating current sold.
Nikola Tesla stunned audiences when he wirelessly lit up glass tubes filled with gas. He called it cold light.