Commas are like people on the subway: You think you know them, but they're awfully complex. This week, we'll dig deeper and get to know some of their jobs: separating items in a series (the Oxford comma), delineating appositives, and surrounding nonrestrictive phrases. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.