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View full lesson: http://ed.ted.com/lessons/grammar-s-great-divide-the-oxford-comma-ted-ed

If you read “Bob, a DJ and a clown” on a guest list, are three people coming to the party, or only one? That depends on whether you’re for or against the Oxford comma — perhaps the most hotly contested punctuation mark of all time. When do we use one? Can it really be optional, or is there a universal rule? TED-Ed explores both sides of this comma conundrum.

Lesson by TED-Ed, animation by Zedem Media.