From its first tentative experiments and the early days of wireless, radio has expanded into a universal medium of communication. It leaps around the world on short waves linking capitals in a fraction of a second. It jumps to high satellites to put its footprint across a continent, and it streams through the Internet to reach every digital device around the globe. It brings that world to those who cannot read and helps maintain a contact for those who cannot see.
It is used by armies in war and by radio hams for fun. It controls air traffic, directs the taxi, and is essential for fire brigades and police. It is the enabler of business and commerce, and as WiFi feeds the smartphone, iPad and countless other devices, ...
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