A ‘supernote,’ or nearly-perfect counterfeit $100 bill, was recently found in South Korea

The US dollar is the most popular note to counterfeit

Counterfeit operations are often controlled by rogue governments, drug cartels, and more. These organized crime rings often sell counterfeit bills wholesale, for anywhere between 40 and 70 cents per dollar.

A man who counterfeited over $1M explains how to counterfeit money

In 2019, after Jeff Turner forged US banknotes such as the 1996-series $100 bill and the 2013 “blue note,” he was indicted on federal conspiracy and served 10 months in prison. In this video, Turner explains how to spot a fake banknote, and provides information about the materials and processes required to make fake money.

The $1 bill hasn’t been redesigned in over 60 years

From a counterfeiting and forgery perspective, this makes the $1 bill one of the least secure American banknotes. In this video, the Wall Street Journal sits down with a leading currency expert to explore the techniques used to keep cash safe and figure out what's going on with the $1 bill.

The US Currency Education Program created a guide to authenticating currency

This video was created to teach everyday people a few easy ways to spot some counterfeit banknotes. Specifically, it outlines the main security features to check for that are common across many US banknotes, such as the color-shifting ink visible when tiling US banknotes $10 or higher.

A mysterious man named Emmerich Juettner once produced thousands of counterfeit $1 bills

After his wife died in 1937, Juettner fell into financial trouble and soon began replicating $1 bills. These bills aren’t typically prime targets for counterfeiting given their low value.

Governments have historically used counterfeiting for economic warfare

Inserting fake currency into an economy can help destabilize it. During the American Revolution, for instance, the British distributed counterfeit “Continental Dollars” in an effort to devalue the currency being used in the US at the time with the goal of undermining America’s growing financial credibility. The Nazis also ran an extensive counterfeiting scheme during WWII.

There have been many versions of US banknotes throughout history

From the Civil War to the present day, the US has gone through many, many versions of paper money (or “notes”). Some notes, like “demand notes,” were created to finance the Civil War. Others, like “treasury notes,” helped pay for silver.

Thomas and Anne Rogers were famous counterfeiters in 17th-century England

The pair used a practice called “coin clipping,” shaving the edges off silver coins to decrease their weight before sending them back into circulation. When banknotes rather than coins gained popularity, counterfeiting methods evolved—in the 1700s, an early banknote counterfeiter named Mary Butterworth created counterfeit paper money using starched cloth and a hot iron to transfer the pattern of a banknote onto paper.

The Australian $5 bill has an image of a bird that glows when exposed to UV light

That’s just one of the many anti-counterfeiting security measures that the Australian government implements on its currency. Popular banknotes from around the world all include their own unique security features—this infographic outlines a few unique ones.

The Secret Service was originally formed to combat counterfeiting

By the 1860s, an estimated one-third of US currency in circulation was counterfeit. In 1865, the Secret Service was created specifically to combat the country's serious counterfeiting problem, which had led to widespread financial instability. This was partly due to the lack of federal currency standardization in the country at the time.

A company called Bluprynt is combating counterfeit cryptocurrency

While some cryptocurrency advocates might argue that it's more difficult to counterfeit crypto than physical currency, some estimate that fake cryptocurrencies are losing crypto users at least $1.6B each year.

AI could be increasing the opportunities for financial fraud

Systems that can reproduce near perfect counterfeits of legitimate financial documents are increasingly prevalent and sophisticated. The international Association of Certified Fraud Examiners estimate organizations lose about 5% of revenue to fraud each year.

Some coin denominations have ridges etched on their sides, partly to prevent counterfeiting, in a practice called 'reeding.'

North Carolina's original copy of the Bill of Rights was stolen during the Civil War and recovered 138 years later

A Union soldier looted the document from the state archives in 1865 and sold it for $5. It remained in private hands for more than a century before an undercover FBI agent posing as a buyer seized it in 2003 at a Philadelphia office building.

In the 1980s, excerpts from fake diaries of Adolf Hitler were published in a prominent German magazine

Excerpts from the diaries were published in other publications around the world, like The Sunday Times, despite uncertainty about their authenticity. After forensic analysis, the diaries were proven to be fake. The diaries were produced by Konrad Kujau, a petty criminal who frequently produced counterfeits.

Listening to K-pop in North Korea is punishable by execution

As far as we know, North Koreans are instead listening to music that serves as public service announcements or some catchy electronic music for dancing.

Wealthy, 'chaebol' families rule South Korea's economy

A handful of huge family-run conglomerates, or chaebol, are the engines of South Korea’s economy, with Samsung alone representing 20% of the country’s GDP. This gives the chaebol (literally “wealth group”) outsized power, often leading to corruption, labor violations, and anticompetitive practices. One economist interviewed in this Vice documentary says the chaebol have replaced Korean democracy with corporatocracy.

In 2019, a laptop loaded with six of the worst malware in history and described as 'an exhibit of historical weaponry' sold for $1.3M.

Once limited to expert studios, automated tools can create convincing deepfakes

Although the best deepfakes are engineered using generative adversarial networks where systems compete to create and assess fake data until the two cannot be distinguished, simpler tools have allowed nonexperts to develop deepfakes for financial scams, political deception, and nonconsensual pornography.

Imagining the reunification of the Koreas

The idea of reunifying North and South Korea has been a geopolitical dream for years, though one that feels perpetually out of reach. That hasn’t kept some from imagining it, though. Reddit user Aofen created a set of maps that postulate what effect a hypothetical reunification would have on population numbers, birth rates, median income, political affiliation, and more.

The US dollar is the most widely circulated currency in the world, and is involved in nearly 90% of global transactions

The most expensive shoe ever sold is from Nike

A prototype of Kanye’s Air Yeezy’s from 2008 sold for $1.8M in 2021. Kanye West wore the shoes at a Grammys performance in 2008, and they became one of the most sought-after samples in sneaker history.

Superfans of K-pop group BTS gamed the Billboard chart

In 2021, the boy band scored a number one hit with “Butter,” its second English-language track. As Stereogum writer Tom Breihan points out, though, it rose to the top of the charts without actually being the most popular song in the country. Other songs were considerably more popular on streaming platforms, but BTS’ hyperdevoted fanbase realized that purchasing digital downloads weighed more heavily in Billboard’s methodology. Recognizing an opportunity, BTS dropped the price of a download to 69 cents, securing their place on the top of the charts.

The idea for the Federal Reserve was conceived in secret in 1910—with bankers donning duck hunt gear for disguise while traveling to a remote country club on Georgia's Jekyll Island

Coca-Cola claims that only two people in the world know the full Coca-Cola formula

They are supposedly two Coca-Cola executives. Over the years, a number of handwritten formulas have surfaced to the public, but Coca-Cola has ruled all of them as inauthentic.

The GENIUS Act passed in the US in 2025 was a major milestone for stablecoin regulation

GENIUS stands for the "Guiding and Establishing National Innovation for US Stablecoins." The GENIUS Act defines payment stablecoins as digital money rather than investments and was the first significant piece of stablecoin legislation in the United States.

22 fascinating discoveries of massive gold coin hoards

The gallery highlights major gold coin treasures from ancient to modern times, from the Saddle Ridge hoard in California in the 1800s (now worth $10M) to finds in Baltimore, Kentucky, and more. Each discovery reveals something about the period, with some buried and others left in vaults.

Mapping where the drug captagon is seized worldwide

In the 1960s, Captagon was patented in Germany as a stimulant similar to amphetamines. It was prescribed for a time to address narcolepsy, ADHD, and other conditions. As its addictiveness and psychosis-inducing quality became more apparent, the drug has been banned in many countries. A robust illicit manufacturing of the drug endures in the Middle East, especially in Syria and Lebanon. Track locations where the drug has been seized on this updated map.

In 2019, a laptop loaded with six of the worst malware in history and described as 'an exhibit of historical weaponry' sold for $1.3M.

The original copy of the Declaration of Independence is not a pristine document, and even features a smudged anonymous handprint in the bottom left corner.

Art theft is the third-largest source of criminal revenues worldwide, thanks in part to the subjective nature of valuing a work of art.

Memecoins are a type of cryptocurrency—a form of digital currency with a wide variety of uses—created around popular 'memes,' or viral internet jokes.

Explore fun facts from the USPS, including unique post office buildings, a stamp that traveled past Pluto, and more.

Clever Hans was a 1900s horse that was believed to be able to solve math equations, tell time, and read and comprehend German, until a psychology student discovered how he got his answers.

US intelligence allegedly pursued more than 600 schemes to assassinate Cuban revolutionary Fidel Castro.

The 1987 Nintendo video game 'Stadium Events' isn't known for being particularly fun, but its scarcity has made it a highly sought-after item that has sold for up to $35K at auction.

Neutron stars, the remains of some massive stars after they explode in a supernova, are the densest directly observable objects in the universe.

The most expensive ad of all time was for Chanel No. 5 perfume and cost roughly $33M to produce in 2004—about $57M in today's dollars.

Discover the catastrophic consequences of a failure of the US electrical grid—something that is more likely than many Americans think.

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

In 2009, the nation was gripped by the story of a missing young boy who was believed to be floating over Colorado in a homemade balloon, until it was revealed that he was at home the whole time.

Budweiser stores yeast derived from the original 1800s strain in a secret bunker, which only the Head of Yeast Management can access—not even the CEO

Learn how monoclonal antibodies, which mimic the body's antibodies, can fight diseases like Ebola.

In 2026, Finland was named the world's happiest country for the ninth consecutive year based on its wealth, social safety network, and high life expectancy, among other factors.

'Shogun,' a 1980s TV series, helped popularize sushi in the US by stimulating an American interest in Japanese culture.

Learn how to read a prospectus, the juicy document that any company must file with the SEC before going public.

Fish populations in the Great Barrier Reef have increased after installing waterproof speakers on the ocean floor that played recordings of sounds from healthy coral reefs.

A small portion of The Winstons' 'Amen, Brother,' an obscure '60s gospel record, is the basis for thousands of hip-hop tracks, making it one of the most sampled records ever that's informally known as 'the Amen break.'

For centuries, Niagara Falls has been a magnet for daredevils seeking to conquer one of nature's most powerful wonders, with its 200-foot drop and water rushing at 32 feet per second with 280 tons of force.

Some researchers have labeled nomophobia, the fear of being without your phone, as 'the phobia of the 21st century.'