Read the follow passage then answer the questions:

Television is one of the greatest inventions in the world. It is a means of communication. The first television was demonstrated in 1927 in San Francisco. At that time, its images were black and white. Since then, it hasn’t stopped developing. Modern televisions are flat and attached to the wall. Since 2010, the viewers have had more selections of programs from the Internet because of the invention of smart TV. In 2013, 79% of the world's households owned a television set.

When and where was the first television demonstrated?

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