Question

who is Nicolas tesla?

Answer 1

Nicola Tesla is greatest scientists of all time
Inventor Nikola Tesla contributed to the development of an alternating-current electrical system that's widely used today and discovered the rotating magnetic field (the basis of most AC machinery).

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Answer 2

Nikola Tesla was born in 1856 in Smiljan, Croatia, then part of the Austro-Hungarian Empire. His father was a priest in the Serbian Orthodox church and his mother managed the family’s farm. In 1863 Tesla’s brother Daniel was killed in a riding accident. The shock of the loss unsettled the 7-year-old Tesla, who reported seeing visions—the first signs of his lifelong mental illnesses.