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-The first radio broadcast in history took place on Christmas Eve 1906, when the song 'O Holy Night' and some Bible verses could be heard from Brant Rock Station (Massachusetts).

-In 1910, Henry H.C. Dunwoody and Greenleaf Whittier Pickard invented the galena radio, the first radio device in history. This AM (Amplitude Modulated) radio receiver detected radio signals in the medium and short wave band.

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-Ten years later, the first regular broadcasts with entertainment programmes began.

-In 1922, George Frost developed a prototype radio receiver and installed it in his Ford Model T, the most popular car at the time. It would take a few years for this invention to be incorporated into the automobile.

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-The first Spanish radio experimenter, Matías Balsera, founded the first Madrid association of radio amateurs and broadcast an opera from the Teatro Real in Madrid in 1912.

-Between 1923 and 1924, the first broadcasts were made on Radio Ibérica in Madrid. The first radio station in Spain was EAJ-1 Radio Barcelona and the second was EAJ-2 Radio de Madrid.

-23 February 1981 was an important day in the history of radio in Spain. That night, Spanish society was able to follow live on radio the attempted coup d'état that took place in the Congress of Deputies.

-Known as 'La Noche de los Transistores' (The Night of the Transistors), that day marked the consolidation of radio as a news medium.

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-In the 1940s, radio took a leap forward with the appearance of the first frequency modulation (FM) systems, which improved the radio system.

-John Bardeen, Walter Brattain and William Shockley were three engineers at the Bell Company, one of the first and most important telecommunications companies.

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-The three evolved the world of radio and electronics by inventing the first transistors in 1948 and received the Nobel Prize in Physics in 1956.

-Transistors were small devices that replaced radio lamps and made it possible to reduce the size of receivers.

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Learn how Alexander Graham Bell went to revolutionize telegraphy, but instead invented the telephone Contunico © ZDF Enterprises GmbH, Mainz

NARRATOR: In the mid-19th century, telegraphy was considered a miraculous technology. But its limits were quickly reached, since only one message at a time could be transmitted down the telegraph wire. The telegraph companies of the time invested heavily in research in an effort to increase the transmission rate along with their profits. The greatest inventors of the 19th century, among them Thomas Edison, were hard at work on a solution. Edison's genius produced a machine that could send up to four messages at the same time. Alexander Graham Bell, an unknown teacher of deaf-mutes, also threw his hat into the ring in this technical race, although for other reasons. His was eager to help people take communication to new heights. An original drawing from his diaries reveals how Bell went about solving the problem of voice transmission. Sound waves produced by a voice cause a membrane to vibrate, moving a thin metal sheet within a magnetic coil. This generates an electrical current with subtle fluctuations that are transferred to a membrane at the receiver, which makes them once again audible. At least this was his theory. But turning this theory into reality took many, many attempts and experiments.

Bell worked day and night on the problem of transmitting speech over distance. He invested every penny he had and confronted the best engineers of his time. In March 1876, Bell and his assistant Thomas Watson held the first telephone call in history. On his 29th birthday, Bell achieved his lifelong dream. He received the hotly contested patent for a technology that remains an indispensable part of our lives to this day. He wanted to revolutionize telegraphy, but instead he invented the telephone. Bell unveiled his invention to the public at the World's Fair in Philadelphia, where he was awarded a prize for the most useful invention of his time.

JOSEPH HOPPE: "The press showered him with attention. All at once he went from being an unknown inventor to a personality known throughout the nation, perhaps even the world."

NARRATOR: The demand for Bell's telephones was gigantic. But initially they were only for rent, not for sale, allowing Bell to retain control over the telephone business. His fortune grew accordingly. After Bell became known as the inventor of the telephone, many other scientists tried to claim the title. Even though other inventors had been working on similar ideas at the same time, Bell's telephone remains a pioneering invention to this day. This is most likely because he was the first to receive a patent for his invention.

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Learn how Alexander Graham Bell went to revolutionize telegraphy, but instead invented the telephone

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NARRATOR: In the mid-19th century, telegraphy was considered a miraculous technology. But its limits were quickly reached, since only one message at a time could be transmitted down the telegraph wire. The telegraph companies of the time invested heavily in research in an effort to increase the transmission rate along with their profits.