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Parentheses are similar to dashes: you are setting off a nonrestrictive group of
wordsof words, but you are not trying to emphasize them. You are including additional
information additional information for those readers who may be interested.

Standard

Shakespeare arrived in London (a town of moderate sophistication) in the late 1580s or early 1590s.

While on vacation, I read Station 11 (a book about rebuilding civilization).