As if you needed another reason to have a slice, Sept. 5 is National Cheese Pizza Day.
But what do you know about pizza — or more specifically, how much pizza Americans really eat? Here's a look at some pizza facts you might not have known.
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To continue the celebration, the following is where you can find the pizza capitals of the United States. And if you're looking for free pizza, entertainment website Thrillist compiled a list of where you can find free slices at national and several local chains.