Open Dictionary.app, and then select Go » Front/Back Matter from the menus. You'll then see a list of helpful items, each of which can be explored with a click. Here are some of the more interesting sections:
- Language Guide
- Rules of English: Understanding Grammar
- Words: Making the Right Choices
- Clichés
- Proofreader's Marks
- The History of English
- Countries of the World
- Chemical Elements
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