具體描述
True or False? The telephone was Alexander Graham Bell's first invention. False Alexander Graham Bell invented a talking machine when he was fifteen years old. Even before that he had invented wheat husker. As a young man, he taught deaf children how to talk at a school in Boston, Massachusetts. He invented a metal detector that was used in several wars to find bullets in wounded. Later in life, he experimented with small airplanes and special boats called hydrofoils. One hydrofoil set a speed record of seventy-one miles per hour in 1919, making it the fastest boat in the world.
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