He had a photographic memory.
Possessing the ability to read books and periodicals while simultaneously committing them to memory served Tesla well; he used all the information he acquired as an internal library, available at his beck and call. As a result, Tesla rarely made drawings of his inventions, but worked from a picture or a memory in his head.
He spoke 8 languages.
No doubt hastened by his eidetic—commonly known as photographic—memory, Tesla was fluent in 8 different languages: Serbo-Croatian, English, Czech, German, French, Hungarian, Italian and Latin. Linguists refer to such a person as a “hyper polyglot”, or someone who can speak more than six languages with great proficiency.
He invented the first hydroelectric power plant.
In 1895, along with George Westinghouse, Tesla built the first power plant to tap the hydroelectric potential trapped within Niagara Falls. The Niagara Falls Power Company marked the final victory of Tesla’s Poly-phase Alternating Current (AC) electricity, which powers the world today.