1066. Do you really need that comma? Should your dashes have spaces? Is there ever just one "right" way to punctuate? June Casagrande, author of "The Best Punctuation Book, Period," busts punctuation myths, compares style guides, and looks at the surprising complexity of the humble em dash.

Find June Casagrande at grammarunderground.com.

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The best punctuation book, period, with June Casagrande