Since time immemorial, people dreamed of a fast and reliable transmission of messages over a distance. These dreams were reflected in numerous folk tales of the miraculous magic carpet ride, listening ear, a messenger, like hearing the grass grows, the magic mirror that lets you see everything going on in the world. Nowadays, all these dreams to a large extent implemented.
Wonderful magic carpet became an everyday vehicle, subordinates strict schedule. On this plane there are several "magic mirror" - radar. With their help it is safe to fly at night and in fog, and even land at the airport without seeing it. Fairy keen ear is now available in every home in the form of radio, thanks to which we are always aware of the day's events, listen to concerts, lectures, conversations. Within minutes, changing the configuration of the receiver, you can "visit" in various cities of our country and even abroad.
Modern science and technology are closely related to the use of radio. The use of radio for communication is a major achievement. Gone are the days when communication was used to "live phone" when the messages were transmitted "from mouth to mouth."

In the battle of Marathon took place in the valley near the city of Athens, the Greeks who defended their homeland, routed the "invincible" Persian army. With the news of the victory was sent a runner, running non-stop 42 km 195 m to the gates of Athens. Exclaiming, "Rejoice, we won" runner died. Now running at such a distance is made often, but not to transmit messages, but from a purely sporting purposes.