1891——Made a report entitled "Experiments on Extremely High Frequency Alternating Current and Its Application in Artificial Wireless Luminescence" and applied for a patent for "Star Oscillator for Vibrating Transmitters" . \x0d\ 1892 - Came to London and gave a report entitled "Luminescence and other high-frequency phenomena" at the Royal Academy of Sciences, and gave a report on "Alternating Current Experiments at High Voltage and High Frequency" at the Institute of Electrical Engineers, and in Paris Made the same report. \x0d\ \x0d\ Tesla also invented the Tesla transformer, the AC motor, the foundation of modern computers, wireless communications, solar systems, radar devices, robots, death rays, lie detectors, and proposed the concept of electromagnetic radio frequency weapons.. .These inventions and discoveries surpassed the science and technology of the time by several eras, and some theories cannot be perfectly answered even by today's most advanced science and technology. After Tesla's death, the U.S. FBI confiscated all his design drawings and experimental works, and the U.S. military has not stopped studying his papers to this day. This also creates a sense of mystery for Tesla.