The article argues that students will usually pick up new words outside of the classroom. In other words, you do not normally learn new words by having your teacher explain them to you. Many studies have been done that support this point of view. How then do we pick up new vocabulary? The answer is by being exposed to new words, both verbally and in print. Conversation, books, newspapers, magazines, and television are all sources from which we learn new words.
However, these sources are not equal. In 1988 a study was done by Hayes and Ahrens which looked at how many rare words there were in various sources of spoken and written language. A rare word is defined as one being outside the top 10,000 most commonly used words.
Here are some selected findings:
- Newspapers: 68.3 rare words per 1,000
- Popular magazines: 65.7 rare words per 1,000
- Children's books: 30.9 rare words per 1,000
- Popular prime-time adult television: 22.7 rare words per 1,000
- University graduates conversing with their friends and spouses: 17.3 rare words per 1,000
The article also examines why children who do more recreational reading tend to perform better academically. In another 1988 study, it was found that 30% of children did on average only about 1 minute of reading a day. In a year, such children will read about 100,000 words, which seems like a lot.
However, children who put in a little effort and read for about 20 minutes a day will read 1.8 million words in a year. Just imagine how many new words such children are exposed to. It really is no wonder that these students perform better at all subjects, not just English. Having a good vocabulary lets you express yourself better, which helps you in every subject.
So the obvious conclusion is to set aside some time every day for reading. It doesn't have to be a book - magazines, newspapers, and quality Internet sites are all excellent sources of new words.
Source:
Cunningham and Stanovich (2001), 'What reading does for the mind', Journal of Direct Instruction, vol. 1, no. 1-2, pp. 137-149.

