"It was a typical Friday night at Costco in Corona. Customers, including an off-duty Los Angeles police officer, 32-year-old Kenneth French and his parents, waited in line for food samples." How many ...

DEAR RICHARD: The Oxford comma, also known as the serial comma, is the comma used before the conjunction in a list of three or more items. For example: “I like to eat apples, bananas, and oranges.” I ...