Language, and our perception of it, has gone through some big changes over the last decade, especially as we communicate more over text. As you may have noticed, the smallest punctuation marks can now make the difference between sounding friendly or angry.

We're talking about this evolution with the "Grammar Girl" herself, Mignon Fogarty. She's celebrating 15 years of her award-winning podcast. She has also written seven books about grammar and she's even shared her grammar expertise with Oprah Winfrey.

Mignon explains the common mistakes we all make and whether it's ever ok to correct someone else's grammar.

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