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

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

The long-lost art of coded postage stamps

In the 1800s, the postcard was a relatively new phenomenon, as was the post office. In the burgeoning system, recipients of mail had to sometimes pay prohibitively costly fees to receive it. So to get around the fees, a system of placing stamps on the envelopes in specific ways to communicate—a simple yes or no—was devised by clever mailers and expanded and codified by postcard companies into guides. Learn about the fascinating system here.

Mark Twain had many gripes with the US Postal Service

Twain often complained about the cost of postage and the service's inefficiencies, often sharing these criticisms in newspaper opinion pieces. Still, in 1907, the USPS issued a commemorative stamp featuring his face.

Mark Twain spent decades feuding with the US Postal Service, convinced its costs and regulations were bureaucratic overreach.

The USPS spent $3.97B in 2024, accounting for .058% of the federal budget.

In 2001, Pizza Hut became the first company to deliver pizza to space

The chain paid the Russian space agency nearly $1M for the promotional stunt, which saw a Russian cosmonaut eat the pizza on video. Other unusual objects to make it to the International Space Station include a gorilla suit, an espresso machine, and several musical instruments.

In 1882, American Express began offering money orders to compete with the US Postal Service

Money orders were American Express' first move into financial services. USPS launched its money order service in 1864 as a way for Civil War soldiers to send money back home. Between the 1880s and 1920s, immigration into the United States surged;the American Express money order service gave immigrants a way to send money to family members living in other countries.

Anticipating moon tourism by 2000, Pan Am issued 'First Moon Flights' club cards

More than 93,000 cards were issued between 1968 and 1971, creating a waitlist that began when Gerhard Pistor, an Austrian journalist, visited a Viennese travel agency to request a flight to the moon. The cards were issued at no cost and numbered in the order they were issued.

The 'Where's George?' project tracked a trail of $1 bills across the US

Over a decade ago, a group dedicated its time to tracking $1 bills in the US. They would stamp single bills with the phrases “currency tracking project” and “Track me at WheresGeorge.com” in a practice they dubbed “Georging.”

Hundreds of thousands of children still write handwritten letters to Santa

Children have been writing letters to Santa Claus for centuries, but in the early 1900s, Santa started writing back. That’s when the United States Postal Service began Operation Santa, allowing its employees to help answer St. Nick's mail. In 2017, the USPS started accepting digital letters to Santa.

The platinum coin, explained by the creator of the idea

An obscure US Mint law permitting it to create platinum coins of any amount surfaced as a possible means of quickly paying down the national debt. Here's an explanation from the creator of the idea.

Tracking where people moved in the US in 2022

The latest data from the US Postal Service's change of address request system shows a decline in migration in 2022. See where people are moving and where they are leaving with this data breakdown.

Before humans, the Soviet Union and the United States sent animals—including apes, dogs, and cats—to space during the Space Race.

Browse a list of the most important invention from each state

From Alabama's electric hearing aid and Idaho's television to Washington's artificial heart and Wisconsin's space suit, this map highlights technological breakthroughs with outsized impacts from each US commonwealth. The District of Columbia is also featured as the state of origin for the telegraph and Morse code. (Some readers may experience a paywall.)

The attack at Pearl Harbor led to the world's first around-the-world commercial flight

A World War II-era commercial flight was forced to change course when Pearl Harbor was bombed, leading the 12-member crew on the world's first commercial flight to circumnavigate the globe. The Boeing 314 crossed the equator four times during the journey, which totaled more than 30,000 miles and required the crew to strip the plane of any identifying marks.

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.

The Erie Canal reduced freight costs by 90%

Before the canal, shipping goods overland cost about $100 per ton. After its completion in 1825, rates fell to just $10—making western farm products competitive in eastern markets for the first time.

Pre-coin currencies like shells were subject to counterfeiting

While it is difficult to pinpoint the very earliest form of money that was used, a type of shell called cowrie shells were used as currency as far back as 3300–2000 BCE. These shells were imitated using ivory, bone, clam shells and more.

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

Illinois man finds 46-year-old Christmas present addressed to him while remodeling his parents' home

In 2025, a 53-year-old man found a gift addressed to him from around 1978 when he was about 6 years old. He located the gift, a box of Matchbox model airplanes, behind a wall, and opened it in front of his parents.

Observations from Hubble contributed to Pluto's demotion from planetary status

Before the flyby of Pluto by the New Horizons spacecraft, the Hubble Space Telescope provided images of Pluto and its moon Charon, which was similar in size. Rather than a unique ninth planet, Pluto became reclassified as a dwarf planet, like many similar objects in the Kuiper Belt.

History finds of 2021

The year’s most exciting discoveries include a Viking “piggy bank,” a lost Native American settlement and a secret passageway hidden behind a bookshelf

Internet sleuths solve secret message on Perseverance rover’s Mars parachute

In 2020, the Perseverance Rover landed on Mars, sending a message for the folks back home on its parachute. It took fewer than six hours for the Internet's collective forces to decode the secret slogan hidden in the parachute's colors and patterns, as well as the geographic coordinates of the earth-bound place where rocketry was perfected.

The world's quirkiest time zones

In contrast to telling time by physical signs like the sun or stars, cultural time relies on political agreement and standards. The convention of time zones arose due to transportation and communication advancements, and while many work just fine, some are pretty wild. Chief among those is the time zone of the uninhabited Baker and Howland Islands in the central Pacific, which results in a technical 26-hour day.

Countries tried to curb plastic waste, but the US keeps shipping more

Data show that American exporters continue to ship plastic waste overseas, often to poorer countries, even though most of the world has agreed to not accept it.

Jules Verne helped popularize the banana

In his 1872 book "Around the World in 80 Days," the sci-fi writer described the banana, then mostly a novelty, as "healthy as bread and as succulent as cream." That mention, along with an appearance at the 1876 World's Fair in Philadelphia, helped transform the fruit into a standard part of a healthy diet.

Apollo astronauts left items in the moon's 'toss zone,' including golf balls, family photos, and bags of human waste, to make room for lunar rocks.

A visit to the Federal Helium Reserve, which once supplied up to 30% of US helium

The underground storage facility in Amarillo, Texas, was established by the Helium Act in 1925, when helium was viewed as a strategic resource whose export could enable other nations to use it for military airships. The Helium Privatization Act of 1996 instructed the Department of the Interior to begin selling off the facility and reserve, with the final sale occurring in 2024.

The 50 weirdest roadside attractions

A summer road trip isn’t complete without stopping at a few bizarre roadside attractions. This list collects the strangest from every state, including a martini-drinking pink elephant in Indiana, a potato hotel in Idaho, and a giant tire in Michigan.

Sears used to sell entire DIY houses in its catalog

From 1908 through the 1940s, Sears sold DIY house kits starting at $600. An estimated 100,000 homes were built, but fewer than 5,000 have been identified today.

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

Domino's Pizza's 30-minute delivery guarantee was responsible for the chain's 1980s surge, but it was discontinued after the company was found liable for delivery driver accidents.

Track the location of the Voyager probes, currently between 13 and 15 billion miles away from Earth.

In 1984, Operation Smash Hit intentionally crashed a 239-ton train into a nuclear waste canister at 100 miles per hour to prove the canister's safety, which remained completely intact and lost just 0.29 of its 100 pounds of pressure.

The history of many kitchen appliances involves unexpected discoveries and applications, including wartime radar turned hamster defroster and replacing an 'ice king' with heat-stealing boxes.

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.

Massive 3D printers have been used to build homes by stacking layers of 'concrete toothpaste,' a fire-resistant material that effectively insulates against outside noise.

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

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.

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.

When a Paris department store hesitated to sell Estée Lauder's perfume, she 'accidentally' broke a bottle, causing the smell to spread throughout the store and shoppers to start asking to buy the scent.

The story of Dollree Mapp, whose legal challenge over her 1957 conviction for possessing "obscene material" led to a major strengthening of the Fourth Amendment

SpaceX's S-1 or 'prospectus' revealed many previously unknown details about the company, including its unprofitability despite doing $18.7B in revenue in 2025, exactly how many voting shares Elon Musk will have in the company (roughly 85%), and more.

Elk Cloner, the first computer virus to spread in public, was written as a practical joke by Richard Skrenta, a Pittsburgh high school student.

See this overview of the firework rules across all 50 states, ranging from a complete ban on non-professional fireworks in Massachusetts to states with more lax rules like Indiana.

About 2,000 US babies are born annually without some portion of their limbs, potentially leading to a lifetime of pricey prosthetics.

The United States has had a tumultuous relationship with Cuba since its 1959 revolution, highlighted by a nuclear crisis and a decades-long trade embargo.

See how Budweiser's famous Clydesdales spend their days at Warm Springs Ranch, where roughly 70 to 80 of the beer brand's giant horses can be found at any given time.

Coral polyps reproduce via broadcast spawning, where entire reefs simultaneously release reproductive cells for about one hour, once a year.