What do you know about radio?

The radio has a long, rich and interesting history, much of which is not commonly known.  Here is a short list of some fun facts you may not know about how radio’s history still influences us today.
Guiglielmo Marconi sent the first ever radio transmission in 1896. Despite being known as “the father of radio”, he was only able to transmit radio signals, not voice. The first experiments with broadcasting voice transmissions did not occur until the early 1900s.
Nikola Tesla was the genius should have actually received the credit for inventing the radio – As early as 1892, Nikola Tesla created a basic design for radio. Marconi claimed all the first patents for radio, something originally developed by Tesla. Nikola Tesla tried to prove that he was the creator of radio but it was not until 1943, where Marconi's patents were considered invalid; however, people still have no idea about Tesla's work with radio.
Most radio commercials are only 15 seconds long, yet it is considered one of the most effective ways to reach an audience.
The first Payola scandal rocked the radio world in the late 1950s and Early 1960s - Unbelievably, record companies would pay deejays and radio stations large sums of money to air certain songs, which were presented as being part of a normal day’s broadcast, in order to illegally increase sales.
AM (Amplitude Modulation) was one of the first radio waves to be used for radio broadcasting. Its wavelength is about as long as a football field and the antennas used to transmit them consumed up to 50,000 watts of power.
KDKA of Pittsburgh, Pennsylvania was the world’s first commercial radio station - Only six radio stations east of the Mississippi River can still use the "K" as the first letter in their call signs, every other station uses "W." Canadian radio stations use the "C" as their first letter and stations in Mexico use "X."