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66. The telephone was invented in 1876.
67. Bell began inventing things at the age of 12.
68. He became interested in studying sound and human voice because his mother began to lose her hearing and became deaf, which affected him greatly.
69. Bell's students in the USA were deaf students who could not hear and communicate.
70. The first words Graham Bell spoke over the telephone were "Mr. Watson, come here; I want to see you."
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