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When the technology was founded: The 'modern' television was born in 1926.
Why the technology will be around for another 20 years: Radio and television has supported the world in times of crisis and in times of joy. Even though technological developments have changed the way we listen to radio and in particular television, the window to the world is still ever present in all but every household in the modern world.
Though on-demand media and 'broadcast control' technology like Sky+ and TiVo has brought an extra dimension of command to our television broadcasts, the key element is the set itself. It's not going anywhere any time soon.