1

In God we trust

Image: Kelly Sikkema

The famous phrase "In God We Trust" hasn’t always been part of our money. It first showed up on some coins during the Civil War , when the country was looking for hope in tough times. It didn’t become standard on all bills and coins until 1955, during another period of strong religious feeling. Today, it’s part of our national identity and one of the most recognized mottos in the world.

2

The all-seeing eye on the dollar

Image: Thought Catalog

That little pyramid with an eye floating above it on the one-dollar bill has sparked plenty of wild theories, but the truth is rooted in history. Known as the "Eye of Providence," it represents divine guidance and watchfulness . The Founding Fathers saw it as a symbol of wisdom and protection.

3

The Secret Service started with cash, not presidents

Image: Collin

When the Secret Service was created in 1865, it had nothing to do with protecting the president. Its original job was to fight counterfeit currency , which had become a huge problem during the Civil War. Back then, nearly one in three bills was fake! The agency did its job so well that it built the foundation for the secure money system we have today.

4

The $10,000 bill that once roamed the banks

Image: Artem Beliaikin

Yes, there really was a $10,000 bill, and it carried the face of Salmon P. Chase, who served as Lincoln’s Treasury Secretary . It was never meant for everyday use at the store, of course. Banks used it for large transfers between Federal Reserve branches. Although it’s been out of circulation for decades, collectors still love to get their hands on one.

5

Fighting fakes with science

Image: Alexander Grey

Counterfeiting has been a problem since the first coins were made, but modern bills are loaded with clever security tricks . Watermarks, color-shifting ink, and hidden security threads help stop fake money before it spreads. If you tilt a newer bill in the light, you’ll see colors shift and patterns appear. It’s not just decoration, it’s actually protection.

6

Paper money doesn’t live forever

Image: Emilio Takas

Every bill has a limited lifespan. A $1 bill lasts about five years before it wears out, while higher denominations tend to last longer since people handle them less often. When a bill becomes too soft or torn, the Federal Reserve removes it from circulation and replaces it with a new one. Check your wallet and see if any of your bills need changing!

7

Tiny text with a big job

Image: Pete Alexopoulos

If you look very closely at your bills, you might spot lines of tiny printed words around the portraits and borders. That’s called microprinting. It’s so small that it’s nearly impossible to copy accurately. Most people never notice it, but it’s one of the details that protects the money from being easily counterfeited.

8

The penny paradox

Image: Annie Spratt

It’s funny to think about, but a single penny costs more than one cent to make. The mix of copper and zinc isn’t cheap , and that’s been true for years. Some even say it’s time to retire the penny, while others can’t imagine America without it. Maybe it’s more than money. Maybe it’s nostalgia that keeps Lincoln’s little coin alive. What do you think?

9

When spare change becomes treasure

Image: Gio Bartlett

Sometimes a coin is worth far more than its face value. The 1913 Liberty Head nickel is one of the best examples. Only five of them exist, and one sold for over four million dollars! Collectors spend years searching for coins like that. It’s part history lesson, part treasure hunt. It may look like an ordinary coin, but it’s really priceless!

10

A woman’s face finally gets her due

Image: Kirt Morris

For most of our history, only men appeared on our currency. However, that’s changing. There are renewed efforts to redesign the twenty-dollar bill and feature Harriet Tubman in it, the fearless leader of the Underground Railroad. Even if it’s not official yet, it’s an important step toward showing the full story of America.

1

The spacesuit satellite

Image: Sieuwert Otterloo

Shoving an astronaut suit out of an airlock and into space might seem like a scene from a movie, but it really happened. In 2003, an empty spacesuit was thrown into space , nicknamed Ivan Ivanovitch (or Mr. Smith), stuffed with old clothes and a radio transmitter .

The idea was that old spacesuits could be used as satellites. SuitSat-1, as it was named, went on to spend several months in silent orbit before entering Earth's atmosphere and burning up on September 7, 2006.

2

The "invisible" gorilla

Image: Mike Arney

In this strange psychological experiment, researchers asked participants to watch a video of people passing a basketball and count how many passes were made. The catch was that, during the video, a person in a gorilla suit walked into the frame, stopped to pound its chest, and then walked out.

The study revealed a curious phenomenon known as "inattentional blindness": people were so focused on counting the passes that they failed to notice the gorilla .

3

Space spiders

Image: Vidar Nordli-Mathisen

In 2011, scientists sent two golden silk orb-weaver spiders on a 45-day trip aboard the ISS. They were kept in an adequate habitat, and both spiders adapted beautifully, continuing to spin their webs and hunt for food.

But not everything was normal. In microgravity, the spiders spun their webs differently —flatter and rounder—compared to the more three-dimensional, asymmetrical structures that orb-weavers spin on Earth.

4

Bitter fingernails

Image: Nick Karvounis

In 1942, a professor conducted an experiment with boys who had been diagnosed as chronic nail-biters. He used a phonograph with the recorded message " My fingernails taste bitter ," playing it over and over at night in the room where the boys slept.

At the end of the summer, the professor examined the boys' nails and concluded that 40% of them had kicked the habit.

5

Syrup swimming

Image: Arwin Neil Baichoo

In 2004, sixteen people with varying swimming skills swam in both a regular pool and a pool of guar syrup , which is twice as thick as water, for an experiment conducted by the University of Minnesota. The differences in their recorded times were negligible.

6

Bearcats and popcorn

Image: Corina Rainer

People encountering bearcats have noted that these animals smell like movie theater popcorn. A non-profit organization tested the bearcat's urine , and the results showed the presence of a chemical compound called 2-acetyl-1-pyrroline.

As it turns out, this is the same compound that gives popcorn its signature smell .

7

The 28-hour day

Image: Ocean Ng

Hoping to find out whether the 24-hour sleep-wake human rhythm was merely a habit, two scientists spent 32 days in a cave to avoid any external reference to day and night.

They tried out a 28-hour day, sleeping for 9 hours, working for 10 hours, and having 9 hours of leisure time . The younger scientist adapted within the first week, while the older one failed to adapt.

8

The fake doctor

Image: Hunters Race

A fake doctor delivered a lecture in 1970 to a crowd of assembled experts titled "Mathematical Game Theory as Applied to Physician Education." His performance impressed the audience so much that nobody noticed he was an actor who didn’t know anything about game theory.

The researchers behind the experiment wanted to find out if a great delivery technique could fool a group of experts—and it did.

9

The electric kite

Image: Brett Wharton

The most famous experiment on our list is also one of the strangest. In 1752, Benjamin Franklin flew a kite in a thunderstorm to demonstrate the electrical nature of lightning .

While many believe otherwise, no lightning hit the kite. Instead, ambient electrical charge moved through the hemp wire, and when Franklin touched the key attached to the wire, he felt a spark, thus proving the existence of such electricity.

10

Moon trees

Image: David Dibert

As we've learned, Americans like taking things to outer space and then bringing them right back. The Apollo 14 mission carried hundreds of tree seeds into space . These "moon trees" were then planted across the country by the US Forest Service.

Unsurprisingly, the trees grew just like any other tree of the same species.

1

An empty whiskey bottle

Image: Zhivko Minkov

In 2015, a time capsule from 1944 was found beneath the City Hall stairs in Lebanon, New Hampshire. Inside was a whiskey bottle with a humorous note: "Whoever finds this bottle may keep it. Sorry, there is no liquor in it, but I drank it all up."

The note was signed by Samuel Stevens, a former city surveyor. Along with the bottle were old newspapers and a penny, but Stevens’ decades-old joke stole the spotlight.

2

Electroshock therapy video

Image: Museums of History New South Wales

In 1958, a time capsule was buried at a former state hospital on the west side of Indianapolis. It included a video from the Bahr Treatment Center's groundbreaking ceremony, which focused on mental health care.

Though some audio is lost, the video references electroshock and insulin shock therapy . The footage is a somber reminder of how far mental health treatment has progressed.

3

A piece of cake

Image: Caitlyn de Wild

During renovations, a Niagara Falls funeral home discovered a 1948 time capsule. It held typical items like newspaper clippings, letters, and postcards.

But one surprise stood out: a piece of cake, possibly from the building's opening party .

4

Vintage optical glass

Image: Daniel Novak

In March 2015, a 19th-century time capsule was found in the cornerstone of a former telescope factory in Pittsburgh. It included what may be one of the first pieces of optical glass made in America .

The Brashear Company, founded by astronomer Dr. John A. Brashear, made telescopes and scientific tools from the 1880s to the early 1900s. By the 1940s, the site was used to produce bombsights for the U.S. military.

5

Lisa mouse

Image: Bryan Natanael

In 1983, Steve Jobs spoke at the Aspen Design Conference and added a computer mouse to the Aspen Time Tube , buried nearby. Meant to be opened in 2000, its location was forgotten over time.

In 2013, a National Geographic crew finally unearthed it. Along with the Lisa mouse, the capsule held a Rubik's Cube and a Moody Blues 8-track tape.

6

Vintage shoestore

Image: Erik Mclean

While technically, this is not a time capsule in strict terms, it can be seen as one. An American family inherited an old building from their grandparents and discovered a forgotten shoe store locked for decades .

The store, active from the 1940s to 1960s, held hundreds of vintage shoes in mint condition, possibly worth thousands. The family is keeping the location secret while they assess its full value.

7

Budweiser beer

Image: Giuliana Catachura

Inspired by Egyptian tombs, Dr. Thorwell Jacobs of Oglethorpe University created a massive time capsule called the "Crypt of Civilization."

Buried beneath the school, it holds items like a Gone with the Wind script, recordings, plastic toys, an English-teaching machine, and a sealed Budweiser . It’s meant to be opened in the year 8113 AD.

8

Stephen Hawking’s DNA

Image: Sangharsh Lohakare

The Immortality Drive, located aboard the ISS, is a memory device designed to preserve human DNA. It holds the genetic codes of Stephen Hawking, Stephen Colbert, Jo Garcia, Laura Hickman , and others.

Also in space are messages from 73 world leaders, left on the moon’s Sea of Tranquility by Apollo 11 envoys in 1969.

9

Spooky message

Image: Daniel Lincoln

In 2016, a time capsule from Montgomery Elementary in Albuquerque was found, containing notes from a 1968 fourth-grade class. Most messages were typical for kids at the time. But one stood out: Greg Lee Youngman began his note with "I am dead" and claimed he was born in 1900 . Whether he was imagining the distant future or pretending to be a ghost, it added a spooky twist.

10

A single black shoe

Image: mostafa mahmoudi

While demolishing his parents' old barn, a man discovered a 128-year-old time capsule hidden beneath the rubble.

Inside were a Mason jar, a newspaper from August 10, 1894, an almanac, a damaged notebook or storybook, and a single black shoe .