Today is National American Beer Day. So, pull a pint of your favorite brew at any time today to celebrate!

Beer is the most popular alcoholic drink in the United States, where over 2,500 breweries produce more than 6 billion gallons annually. Breweries across America include large, well-known brands, regional beers, and increasingly popular craft breweries.

American beer is produced in a variety of styles, but the most popular is a pale lager. Other common styles include brown ale, IPA, porter, and stout. Fun fact: Americans drink more than 50 billion pints of beer each year—enough to fill 1 out of every 25 residential in-ground pools in the U.S.!

Below are 29 Little Known Facts About Beer that you’ll need to know in case of a beer geek-off.