STEM Marvels: Telephone

A telephone is defined as an instrument that facilitates the simultaneous transmission and reception of human voice.

Telephones are not very expensive and are easy to operate, offering immediate and personal communication. The word ‘telephone’ is derived from two Greek words, ‘tēle’, which means ‘far’, and ‘phonē’, which means ‘sound’. Since its invention, the telephone has also helped send d
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