Tell about Elexander Graham Bell

Today, I would like to talk about Alexander Graham Bell who is an American inventor, scientist, and engineer. He was born in 1922 in Scotland. In his private life, he got married with Mabel Hubbard and they had four children. He is considered as a person inventing and patenting the first practical telephone. With his efforts to the invention and a lot of experiments, he succeeded in creating one of the most greatest inventions to the human. Besides, Bell worked extensively in medical research and invented techniques for teaching speech to the deaf. He contributed a lot to the science.