Tesla’s unusual habits and poor social skills, but on the other hand, his love for science and changing things, made him very popular. He had famous close friends such as conservationist John Muir, one of the founders of the Sierra Club, who loved the idea of Tesla’s hydroelectric power system. At the peak of his career, he lived in the Waldorf Astoria with financiers Henry Clay Frick and Thomas Fortune Ryan. One of his famous friends was Mark Twain, with whom he has an exquisite legend. Tesla was working on a high-frequency oscillator, popularly called an earthquake machine, and it almost brought the block to ruins. Twain was known for having digestive problems, and Tesla invited him over knowing his problems. He told him to stand on the platform while he turned on the oscillator, and shortly after Twain jumped off and ran for the facilities.