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The discovery that electromagnetic waves are capable of transmitting information sparked the invention of radio. The technology scaled like the old inventions in the telegraph as well as the telephone. According to some researchers, the amplitude modulation technique originated in the experimental and theoretical work of Leblanc, in 1886, Mayer (1875) and Rayleigh (1894). For example, the very first successful attempt to transmit audio signals over telephone lines happened inside mid-1870s and this may be called one of the first transmissions happening by using some type of amplitude modulation. The Hunger Games trailer opens with Katniss Everdeen and her longtime friend Gale Hawthorne (Liam Hemsworth) hunting inside the woods of District 12, one of many improvised parts of Panem. Trouble has arrived because they accidentally see the reaping ' where youngsters are forced to participate in a lottery, through which two of options are chosen to battle to the death match to be broadcast nationally of Panem. Katniss doesn't want her sister Prim to be sucked in the Hunger Games. Therefore, she volunteers to change Prim, which begins a brand new life for her and her sweetheart Peeta Mellark.