A jovial chap talking on the telephone (Image © Joe Rosenthal, AP, Press Association Images)

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The first telephone capable of sending and receiving speech transmission was introduced and patented by a Scottish inventor named Alexander Graham Bell.

The science behind telecommunications involves the conversion of sound waves into electrical signals. In modern usage the telephone references a system which allows the sending of not only a user's voice but also data, pictures, or any other information which can be encoded and converted into electrical energy.

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