119 years ago today, December 24, 1906 (November 9, 1906, the lunar calendar), radio broadcasting was invented. "December 24, 1906, was Christmas Eve in the West. On this day, most Americans were preparing for Christmas tomorrow. However, at about 8 o'clock that night, on ships shuttling back and forth off the coast of New England in the United States, some radio operators who were accustomed to hearing the sound of Morse code suddenly heard the sound of people talking and music coming from their headphones. It turned out that someone was reading Bible stories and playing Handel's records. At the end of the song, the man with a beautiful voice congratulated everyone on a Merry Christmas. The radio operators were stunned. They shouted loudly and passed their headphones to their companions to prove that they were not babbling in their dreams..."This broadcast was a test broadcast played by Fessenden, the inventor of radio broadcasting, during a broadcast experiment. From a technical point of view, this move is the first time for humans to realize radio broadcasting. Fessenden was born on October 6, 1866 in Quebec, Canada. In the early 20th century, Fessenden taught at the University of Pittsburgh in the United States. During this period, he devoted himself to radio research, and then worked for Westinghouse Electric Company for a period of time. While working at Westinghouse Electric Company, Fessenden still did not give up his research on radio. In 1896, Marconi, who was also studying in the field of radio, successfully transmitted a telegram on the Salisburg Plain in the United Kingdom. The world was shocked and people competed for legend. Fessenden was very depressed to see Marconi walking in front of him. In order to relax, he came to Peterborough, Ontario to play. Although it was for relaxation, all he could think about was radio transmission. One day, he was thinking by the lake and subconsciously threw a stone into the water. The ripples on the lake suddenly lit up his eyes: If sound could be continuously transmitted in radio waves like the ripples on the lake, what would the effect be? Fessenden himself would never have imagined that a seemingly crazy idea at the time had guided him on the right path. He returned to his residence and worked frantically on his new idea. Once, his assistant accidentally jammed the transmission button on the experimental device, and the beep from the device was transmitted by radio to another room where Fessenden was. This phenomenon greatly inspired Fessenden, who believed that since beeps could be transmitted through radio, so could human voices. In this way, another bold idea appeared in his mind. Fessenden clearly knew that with his years of research experience, he could completely turn this idea into reality. So Fessenden set up his new laboratory on an island on the Potomac River and built a receiving station 50 kilometers from the town of Arlington, Virginia, to facilitate experiments. On December 23, 1900, Fessenden's radio technology entered a new stage. He would experiment with the use of radio to transmit sound. Assistant Sessen was at a receiving station 50 kilometers away. "One, two, three, four. Siesen, is it snowing there? If you hear it, please send me a telegram." After speaking into the transmitter microphone, Fessenden waited nervously. A moment later, he received a telegram from his assistant: "Yes, it's snowing here." The ecstatic Fessenden solemnly wrote in the experimental notebook: "This afternoon, here on Kaubo Island, we used radio to realize voice transmission. This was the world's first voice transmission, but the transmission effect this time was not ideal. In the same year, Fessenden established a special laboratory in Brant City, Massachusetts, in the United States, to continue conducting radio call experiments. After hard research, he gradually mastered the modulation technology of transforming human voice into audio electrical signals through microphones, and then superimposed the audio electrical signals on high-frequency electromagnetic waves for transmission. At the same time, he also mastered the technology of demodulating audio signals from radio waves and restoring them into sound through reception and detection. As the technology matured, on Christmas Eve in 1906, Fessenden sent his blessings through radio broadcasts. Although the entire broadcast took only a few minutes, it heralded a revolution in human dissemination of information. Nowadays, radio broadcasting technology has been applied to various fields, bringing great convenience to mankind. Fessenden was studying radio broadcasting