With more than 450 billion Oreo cookies sold since their inception in 1912, it's safe to say they've earned the "America's Favorite Cookie" moniker.

But, it's not just the US who prefers to twist, lick, and dunk their cookies.

Oreo cookies can be found in 100 countries worldwide, and is the best-selling cookie brand of the 21st century.

Pour yourself a glass of ice-cold milk and digest some wonder-filled facts about this iconic sandwich cookie.

Where did that name come from?

The Oreo cookie has gone through quite a few name changes over the past century.

When they were first introduced in 1912, they were known simply as the Oreo Biscuit.

Then in 1921, the cookie embraced its shape and was renamed the Oreo Sandwich.

In 1937, they took a high-brow turn and assumed the name, Oreo Crème Sandwich.

The final name change came in 1974 when the cookie became known as the Oreo Chocolate Sandwich Cookie, or Oreo for short.

It's possible the name Oreo came from "or," the French word for gold, which was the original package color.

Or it could be a simple derivation of the words cream and chocolate.

Creamy little muncher with O-R-E-O.

Knock-off cookie.

Food scientist Sam J. Porcello, aka "Mr. Oreo," invented the newer version of the delicious creamy, pasty, stick-together filling that's become such a staple of the cookie aisle.

But they may not have been all that original.

In 1908, four years prior to the launch of Oreos, Sunshine Biscuits released a sandwich cookie called Hydrox.

Unfortunately for Hydrox cookies, the brand got lost among the buying and selling of its parent companies, and the marketing genius of Oreos, leading them to disappear from store shelves.

Now thanks to Leaf Brands, the Hydrox is back and are ready to defend their "America's Original" title.

High class biscuits.

In 1912, alongside Mother Goose Biscuits and Veronese Biscuits, Oreo Biscuits made up the Biscuit Trio.

The Trio was a variety of the highest-class biscuits available to consumers, a nod to the English biscuits served at teatime.

The cookies were seen as an exciting innovation, and the executives at Nabisco were sure they had three surefire hits.

They were one-third right.

Oreos were the only cookie of the trio to survive.

Double Stuf?

As with all mass-produced food, the perfect ratio of an Oreo cookie is down to an exact science.

So, what about the Double Stuf Oreo?

Is it double the filling, as the name suggests?

Not quite.

According to calculations done by one math teacher, the Double Stuf is actually closer to 1.86x "stuf".

If you really want to eat a Double Stuf, just stack the crème side of two regular-sized Oreos together — and who hasn't done that?

The Giant Oreo.

How many Oreo cookies are too many?

In the middle of the 1980s, the answer was simple — just one Oreo.

In 1984, Nabisco launched the Oreo Big Stuf.

Individually wrapped, the snack was a whopping 316 calories and took around 20 minutes to eat.

For comparison, a single Oreo contains roughly 53 calories.

The cookie was eventually phased out.

Accidentally vegan?

The original recipe for Oreo cookies contained lard, which made them unsuitable for vegans — and they were most definitely not kosher.

But, with the changing climate of the low-fat 1990s, Nabisco decided it was finally time to get rid of the lard and become kosher.

Oh, oh, oh, bright ideas and an Oreo cookie.

It took more than three years to convert their equipment, and with the change brought an unexpected, yet welcoming, side effect — Oreo cookies were now vegan.

Or are they?

Spoon University initially revealed the possibility of the cookies being cross-contaminated with milk.

Additionally, the sugar in a batch of Oreo cookies may be refined with bone char, an animal-derived natural charcoal.

PETA lists Oreo ice cream cones and 100-Calorie Thin Crisps as vegan products.

The original cookie (and many of its flavor offshoots) are nowhere to be found.

Oreo beer.

Oreo cookies have infiltrated the likes of pie crust, churros, and ice cream cones, not to mention the creation of an onslaught of "Cookies and cream" products.

Is it any wonder that the classic flavor has finally made its way into the beer aisle as well?

In January 2017, Virginia-based The Veil Brewing Company released a version of their chocolate milk stout, called Hornswoggler, that was infused with actual Oreo cookies.

Perhaps unsurprisingly, the beer was sold out within a week, because apparently, there's a rampant desire for a cookie-based buzz out there.

Considering how prolific Oreos' various flavor profiles have become, don't be too surprised if you start seeing Oreo beers hit shelves in the near future as a result of this experiment-gone-right.

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