Nikola Tesla (July 9/10, 1856 – January 7, 1943) ushered in the age of electrical power and is regarded as one of the greatest scientists in the history of technology. He was a inventor, physicist, mechanical engineer and electrical engineer, and is recognized among the most accomplished scientists of the late 19th and early 20th century. He developed the induction motor and the fluorescent light-bulb, and created alternating current, which he proved safe by passing it through his body. In the United States, Tesla's fame rivaled that of any other inventor or scientist in history or in popular culture. After his demonstration of wireless communication in 1893 and after being the victor in the "War of Currents," he was widely respected as America's greatest electrical engineer. Much of his early work pioneered modern electrical engineering and many of his discoveries were of groundbreaking importance. Tesla's legacy can be seen across modern civilization wherever electricity is used. Aside from his work on electromagnetism and engineering, Tesla is said to have contributed in varying degrees to the fields of robotics, ballistics, computer science, nuclear physics, and theoretical physics. Tesla considered his exploration of various questions raised by science as ultimately a means to improve the human condition with the principles of science and industrial progress, and one that was compatible with nature.