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

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.

Every printed bill has its own unique serial number

In the US, each bill also has its own plate number, series year, Treasury seal, and more. Each design helps track money and combat counterfeiting.

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.

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

These “supernotes” have even fooled US government officials. North Korea is widely believed to be behind the creation of these counterfeit banknotes.

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

Hamilton has appeared on US paper currency since the Civil War

Since the US began printing money in 1861, Alexander Hamilton has appeared at different times on the $5, $2, $20, $50, $500, and $1000 bills. Since 1928, he has remained on the $10 bill—making him, alongside Benjamin Franklin, one of the two non-presidents currently on US currency.

The Eye of Providence on $1 bills is a lightning rod for conspiracy theorists

The symbol is associated with the Freemasons, one of the world’s oldest secret societies. It also appears on churches, Masonic buildings, and the great seal of the United States.

Chip technology replaced magstripes to stop easy card cloning and fraud

The magstripe on bank cards always gives the same data, making it simple to copy using a device called a grabber. In contrast, embedded chips create a unique code with every transaction, making it much harder to clone or steal card information.

Meet the bowerbird, the bird world's greatest architect

There are roughly 20 species of bowerbird in and around Australia. It is a remarkable species known for its sophisticated nests. From what experts can tell, the bird has one thing in mind when building its elaborate abode: attracting a mate. See the variety of structures each bird makes in this well-written blog accompanied with incredible photos of bowerbird constructions.

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.

Purchasing art is a common money laundering technique

Art is easy to transport internationally, susceptible to price inflation, and usually paid for with cash, making it a frequently used money laundering tactic. Additionally, loose regulations surrounding art transactions allow buyers to remain anonymous, adding an additional layer of ease for people trying to launder money.

'Magic ink' is redefining the tattoo

One University of Colorado professor has developed an ink that can be "turned on" with exposure to UV light, and "turned off" with sunlight. While the ink could help those who want to hide their body art from family members or coworkers, there are potential uses for medical procedures.

An invasive, tree-killing beetle may threaten large swaths of Australia

A Curtin University study warns that large parts of Australia, including major cities and farming regions, could be highly vulnerable to the fast-spreading polyphagous shot hole borer, which releases a fungus that can starve trees of nutrients. The tiny insect has already caused severe damage across the Perth metropolitan area.

Humans have used bioluminescence as a means of military advantage

During World War I, the British Navy sank a German U-boat after spotting the blue light forming at the sides and in the wake of the boat. Jellyfish slime was applied to a Roman walking stick for nighttime guidance, while bioluminescent fungi in Indonesia fulfilled the same purpose.

A list of five everyday products that rely on radioactivity, including exit signs and gemstones

Like some glow-in-the-dark wristwatches, some exit signs contain sealed tubes of tritium—radioactive hydrogen gas—which emit low-energy beta particles that react with surrounding elements to produce light, making them visible without batteries. In smoke detectors, smoke particles disrupt the steady flow of ions generated by americium-241.

Japan is home to intricately designed region-specific manhole covers

The country's eye-catching sewer covers were a form of brand rehabilitation, intended to change people's perceptions of the sewer. Additionally, they're easy to see at night, making firefighters' nighttime duties a bit easier.

Worldcoin: the cryptocurrency collecting biometric data

An ambitious project launched by OpenAI's founder Sam Altman, Worldcoin aims to provide a global financial and identity network based on proof of personhood through biometric scanning of individuals' irises.

Behind the fascinating disguising mechanism of camouflage

Camouflage—nature's master game of hide-and-seek—is more complex than simply how things look. The disguising process required millions of years of evolution that have programmed how our brains take shortcuts. Watch this video to see examples of camouflage and understand how we process it.

Indigenous art's influence on pop art often goes uncredited

Keith Haring’s iconic imagery, often known for its accessibility, was deeply inspired by the artwork of the Indigenous people of Australia. Their artwork influenced aspects of Haring's paintings, such as flat block colors and symmetrical compositions. While some critics find Haring to have appropriated their culture, others find his work to be pushing a message of unity and togetherness.

Visualizing the symbols and history of world flags

More than 200 world flags feature high-intent designs, projecting ideals and values to the world through archetypal symbols, colors, and shapes. This page effectively depicts the data behind symbol and shape usage, how much each country's flag has changed over time, the most popular colors used, and more in a series of elegantly simple charts.

The 'playing card' and 'blueberry' taxes are among the strangest around the world

In Canada, companies making children’s breakfast cereals are granted a tax exemption if their cereal boxes contain free toys. While the exemption is limited to toys that are not “beer, liquor, or wine,” the cereal tax is far from the world's most eccentric tax.

Explore the history, structure, and species of Australia's Great Barrier Reef with this interactive journey narrated by Sir David Attenborough.

See a list of six famous people with animals named in their honor

The bird Polioptila attenboroughi, the spider Spintharus barackobamai, and the water beetle Grouvellinus leonardodicaprioi are just a few of the creatures named after celebrities.

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

A composite of telescope images of the sun, which each reveal unique solar features

While traditional cameras can reveal sunspots—cooler regions on the sun's surface—in visible light, x-ray detectors can highlight explosions of high-energy plasma and magnetic fields known as coronal mass ejections. Hydrogen-alpha filters can reveal clouds and filaments of material suspended in magnetic fields above the sun's surface.

A 1912 congressional bill attempted to prohibit fake photos in the US

In the 1800s, photographs were held up as indisputable resources of truth. But the photography industry devised ways to alter photos, resulting in the rise of fraudulent photos—from shots with celebrities to the turn-of-the-century version of fake nudes—prompting government intervention.

Coral Bleaching

Coral reefs around the world, including the Great Barrier Reef, are undergoing a crisis known as coral bleaching—which threatens both their existence and the ecosystems they support. This comprehensive report from the Australian Museum explores...

X's bird logo cost just $15 and wasn't added until four years after launch

When Twitter launched in 2006, it featured green, slimy lettering and lacked the now-famous bird icon. The bird was adopted in 2010 and eventually became the platform's official logo—unofficially named Larry after NBA legend Larry Bird.

Tattoos remain visible on your skin thanks to immune cells called macrophages

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.

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

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

When caught in the mouths of cardinal fish, seed shrimp release glowing, bioluminescent chemicals, which alert predators of the cardinal fish, prompting the shrimp's ejection.

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

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.

Power lines are dotted with large, brightly colored balls to improve the visibility of these thin wires to helicopters and small planes and help prevent potential crashes.

Ebola species have historically been named after where they were discovered, stigmatizing residents who live there, including Bundibugyo, in Uganda.

Stars appear to twinkle because turbulence in the motion of molecules in Earth's atmosphere causes light to bend and wiggle rapidly on its way to the surface—a phenomenon called scintillation.

American short story writer Flannery O'Connor raised 40 peacocks, which became potent symbols for her fiction's elegant violence

Some Pokémon have been named after real and fictional organisms, while some real-world species have been named after Pokémon, such as Chilicola charizard and Binburrum zapdos.

The United States is one of only around two dozen countries with a fully federal system of government, in which power is divided between national and state governments.

Double world record holder Hunter Ewen helped conquer his fear of balloons, called globophobia, by training to win Guinness World Record titles for balloon inflation.

See 33 images that became central to huge scandals, including a young Charles and Camilla, Michael Jackson's baby on a hotel balcony, and Hugh Grant's mugshot.

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.

Fear or disgust related to clusters of holes and cracks, called trypophobia, may stem from evolutionary processes to help us avoid pathogens.

Hotels in Cannes, the glamorous city on the French Riviera, hire hawks to ward off seagulls during the city's famous film festival.

A century of Billboard issues documenting the evolution of popular music.

Indefinite cloning of some endangered species may not sustain their longevity because cloning success rates decrease as genetic mutations accumulate.

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

Objects can be 3D printed with light by projecting 2D computerized tomography (CT) scans onto rotating cylinders of resin, which solidify upon exposure.