Have a Cup on National Coffee Day

September 29 is National Coffee Day! How should you celebrate? With a cup of coffee, of course!  

Learn about the chemistry and physics behind the perfect cup of coffee at Smithsonian. Or see some coffee statistics. You'll learn a lot about coffee in the Neatorama archives, like 5 Fun Facts About Coffee For National Coffee Day. Read about the beverage's history, like the role coffee played in the Civil War and the story behind Starbucks.

There are a few coffee chains that are offering a free cup of coffee, and even more that have discounts or deals today on coffee. See the list at Buzzfeed.

(Image credit: The NeatoShop)