India pale ales—a.k.a. IPAs—have held an important place in the history of beer manufacturing and distribution since the 18th century. IPAs have helped establish trade monopolies, influenced the way beer is flavored around the globe, and kicked off the modern craft beer movement. Today, the style is one of the most popular in the entire industry—whether you want something bitter and abrasive or sweet and tangy, chances are your local brewery will have an IPA that fits whatever your palate desires. And if you just so happen to want your IPA to be brewed with some of your favorite breakfast cereal, you'll probably be able to find that, too. Celebrate National IPA Day on August 5, 2021 with nine fun facts about the beer you either love to hate … or hate to love.

1. No one knows who invented the first IPA.

George Hodgson of London's Bow Brewery is often credited with the invention of the first IPA in 1793, but it’s up for debate whether he actually deserves this title. The common story goes that in order for beers to survive the long sea journey to soldiers in British-controlled India, Hodgson came up with a lighter pale ale with some extra hops and a higher alcohol content, resulting in a fresher taste and less spoilage once it arrived in India's sweltering climate.

However, according to beer historian Martyn Cornell, pale ales had been around for at least a century before this, and brewers were already adding extra hops to their beer by the 1760s to help them last longer in warmer temperatures. There's even evidence that less-hopped beer was regularly arriving in India without much of a problem—this includes porters, which were actually the most popular style in the country at the time, according to liquor historian Aaron Goldfarb.

2. The East India Trading Company made IPAs popular.

Although Hodgson wasn’t the first brewer to use hops in a beer recipe, his location and generous credit policy are what likely helped him his product a huge hit. His Bow Brewery was stationed close to the East India Company’s dock, where the majority of the Indian trading ships came in and out. He began exporting his beer with the EIC, and to sweeten the deal, he sold his casks on an 18-month credit so they wouldn’t have to pay for it until their ships returned from India. The beer was so popular that Hodgson eventually established a monopoly of sorts, even going so far as to break ties with the East India Company to ship the beer out himself.

3. Early IPAs weren’t overly strong.

Although today’s IPAs are usually among the strongest beer when comes to alcohol content, the first versions of the brew were actually pretty average. Early IPAs were generally 6.5 percent ABV (alcohol by volume), which was the same or even slightly lower than the typical beer at the time. Today’s IPAs average between 6 percent and 7 percent ABV, although these can rank even higher. Molotov Heavy by Evil Twin Brewing Company, for example, is a whopping 18 percent—even higher than a glass of wine.

4. We have the craft beer movement to thank for contemporary IPAs.

England’s IPA craze dwindled by the early 1900s, and consumers began to turn to new beer styles entering the market. But when the craft beer movement started in the 1970s—sparked in the United States by a 1978 Congress ruling that legalized home brewing—beer enthusiasts began to turn to old recipes to invent new drinks. Craft brewers began using American-style hops to put their own unique twist on 150-year-old recipes, leading to some of the first American-based IPAs, including Anchor Brewing's Liberty Ale, Sierra Nevada’s Harvest Ale, and Brooklyn Brewery's East India Pale Ale, which is based on an early IPA recipe from the 19th century.

5. Double IPAs don’t always mean double the alcohol content.

Double IPAs (otherwise known as Imperial IPAs) are an American-style IPA that use double the hops (or even more) of regular IPAs, balanced with extra malt to create a smooth, darker flavor profile than their single-malt counterparts. Even though these IPAs are higher in alcohol content, it’s not by much—double IPAs usually range between 9 percent and 10 percent ABV.

6. The definition of an IPA has expanded in recent years.

There used to be two main IPA styles: English and American. English IPAs tend to have fewer hops; a smoother, more subtle flavor; and are also generally lower in alcohol content. American IPAs, on the other hand, feature hops much more prominently and have a more bitter flavor, rather than an aromatic one. Now, though, you'll find countless subsets within those styles, including New England, East Coast, West Coast, session, Belgian, and milkshake IPAs. Each of these varieties is characterized by its own unique flavoring, brewing, and hop profile. Milkshake IPAs, for example, may be brewed with lactose, vanilla, and fruit, while a session IPA strips out all the adjunct ingredients and focuses on the classic English style with an ABV of around 3 or 4 percent.

7. IPAs have gotten weird.

Craft brewers have gotten pretty experimental over the years, and a few are more unique than others. In 2019, Smartmouth Brewing created a Lucky Charms-inspired IPA by using toasted marshmallows and the iconic cereal in the mash, lending a nostalgic, sweet flavor to their brew. San Diego’s Stone Brewing company used a drought to their advantage—and to inspire more eco-friendly brewing—by having recycled wastewater as the base for their Full Circle IPA. And Blue Point Brewing Co’s Bubble Brain IPA is designed to taste like the gumballs you had to coax out of a machine for a quarter as a kid.

8. Even celebrities are getting in on the IPA business.

With 8764 craft breweries in the U.S. as of 2020, it’s no surprise that even the rich and famous are getting in on the brewing craze. Former WWE wrestler “Stone Cold” Steve Austin has his own Broken Skull IPA on the market, in conjunction with El Segundo Brewery, and actor Kelsey Grammer’s Faith American Brewing Company has its own Calico Man IPA. The most no-brainer celebrity beer has to be from the Hanson brothers, who own a brewery that puts out the aptly named Mmmhops pale ale and a peach milkshake IPA called Pink Moonlight.

9. The IPA craze isn’t going away anytime soon.

Although it might seem like there's bound to be a slowdown eventually, IPA sales are only continuing to gain momentum. In 2020, IPAs accounted for nearly 20 percent of all beer sales on Drizly, the popular online alcohol distributor, as opposed to 16.5 percent the year before. According to the Brewers Association, IPAs are the third-most-popular category of beers, behind only light lagers and American lagers.