Hedy Lamarr came into the spotlight of world cinema at II. at the Venice Film Festival in 1934. It was thanks to the experimental film Ecstasy by the Prague director Gustav Machaté, who caused a world sensation with Heda’s erotic scenes. The film was so shocking that its broadcast was condemned by Pope Pius XX and Adolf Hitler even banned its broadcast completely. He even angered Heda’s sickly jealous German husband, gunsmith Friedrich Mandel, who tried to buy up all his copies. In the end, Hedy ran away from her husband to the USA, where she met L. B. Mayer on a boat, and thus the legend of one of the most beautiful actresses of the silver screen was born. Although she became a movie star whose beautiful face inspired Disney’s Snow White, her contribution to science was more fundamental. During her stay in Prague, the young actress originally from Vienna, Hedy Lamarr, was still called Hedy Kiesler, her full name was Hedwig Eva Maria Kiesler. You can find her traces in Prague in the center of Prague on Wenceslas Square, where the production company of the film Extase Slavia-film was based, in the Alcron Hotel, where the main star of the film was rented a room on the condition that she would also organize a “tea for journalists” and in large cafes where she met film producers, directors and fellow actors. Le Corbusier himself was captivated by the phenomenon of Prague cafes, located on the first floors of all the houses in Wenceslas Square. And he also had a reason: when you walked past them in the evening, you could hear top jazz big bands playing everywhere and you could observe hundreds of people dancing. Even the premiere of the film Extase took place on Wenceslas Square: in the Lucerna cinema, the oldest still operating cinema in Prague. It was opened in the summer of 1909 in a beautiful late Art Nouveau style and today it is a national cultural monument, which is the highest level of architectural heritage protection in the Czech Republic. By the way, Lucerne Palace was built by the grandfather of the famous Czech president and playwright Václav Havel, and his uncle Miloš Havel founded the Barrandov film studios, where the movie Extase was filmed. The next life path of Hedy Lamarr in Hollywood is extremely interesting. For example, she starred alongside Clark Gable or Judy Garland, but her love scandals remained in the minds of viewers, and her film career was practically ended by drug addiction and kleptomania. Independent of her acting and singing career, she got the idea of how to remotely control the torpedoes that protected Britain’s shipping supply from German U-boats. Together with musician George Antheil, they patented a communication system based on a hopping radio signal that could not be intercepted. FHSS – Frequency Hopping Spread Spectrum later became the basis of signal transmission by satellite television, mobile phones, GPS and WI-FI. It granted this patent to the state for free and made no profit from it. She received satisfaction only shortly before her death in 1997, when the international organization Electronic Frontier Foundation awarded her the Pioneer Awards. Hedy died on January 19, 2000 in Florida and her ashes were scattered near her birthplace in Vienna Forest, Austria, according to her wishes.