Read the passage and answer the questions.

John Brown is a lecturer. He went to university in 1982, and was one of the best students at that time. In 1990, he became a professor. He has been a senior lecturer since then. He is a very well known in his teaching career. He has written five books about education, including a book “How to teach deaf children” in 1995. He is married to his assistant, Linda. They have two children.

How many books about education has he written?

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