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Young inventor

Image: Randy Fath

Although we all know that Edison was an inventor -and one of the best- very few know that his passion was already loudly expressed at the young age of 10.

At that age, while other children were naturally playing ball in the park, Edison was already interested in chemistry, physics, mathematics, and electricity. At 12, he set up his first laboratory in the basement of his parents' house, where he began to do his first experiments! Some stories claim that explosions in the basement were more frequent than their parents would have liked.

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Self-taught

Image: Nicola Tolin

Edison's educational path was very different from the one many of us probably had. In fact, Edison had almost no formal education.

Thomas Edison attended school for only a few months. Due to some hearing problems he developed as a child, his mother decided to homeschool him, teaching and encouraging him, which awakened his impressive curiosity and appetite for knowledge.

By the time he was a preteen, he was already an autodidact. This fact was crucial on his way to becoming one of our country's most important inventors.

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Young entrepreneur

Image: Jingda Chen

The young Edison was not only curious and intelligent; he was also an entrepreneur.

When he was just a boy of 12, he sold snacks, candy, cigars, magazines, and newspapers on the Grand Trunk Railroad. From that age, he displayed a determined character, which enabled him to raise money for his experiments.

But his ambition was so strong that he started his own newspaper, the Grand Trunk Herald. That's right! Little Edison assembled and printed his newspaper and sold it to passengers and people who frequented the train stations.

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Hero

Image: Sugden Guy sugden

Did you know that Edison was also a hero? That's right!

In fact, we could say that his act of heroism as a teenager was the event that started his great career. By the age of 15, Edison was working and traveling on the Grand Trunk Railroad, where he became close to a station master and telegraph officer. One day, Edison spotted the station master's two-year-old son playing on the tracks as a train sped toward him. Without hesitation, he jumped and rescued the child.

The boy's father was so grateful that he offered to teach Edison how to use the telegraph system. And what do you think? He accepted immediately!

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Marriages

Image: Fernando @cferdophotography

Between labs and experiments, Thomas Edison also had time for love.

Thomas Alva Edison married twice in his life. His first wife was Mary Stilwell Edison, whom he married in 1871. Mary and Thomas had three children. Sadly, she passed away in 1884 after 13 years of marriage.

His second marriage was in 1886 to Mina Miller Edison. With her, Edison had three more children. As it couldn't be otherwise, it's said that Edison asked Mina to marry him in a rather peculiar way: he proposed using Morse code!

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His children's nicknames

Image: Sandie Clarke

Thomas Edison's creativity was evident in everything he did, and there's an anecdote that exemplifies this perfectly.

The inventor's passion and humor blended and resulted in fun and loving nicknames for his first two children. As we told you, by 1876, Edison already had two children from his first marriage. They were Marion and Thomas Jr., whom Edison called "Dot" and "Dash," respectively. Yes, you got it: it was a reference to Morse code!

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First phonograph recording

Image: Call Me Fred

As you probably know, in 1877, Thomas Edison introduced the phonograph. It was the first device capable of recording and reproducing sound!

As a result of his experiments, this device completely changed the history of communication. But what did the first recording made with the phonograph say?

Edison made a cute choice for his first recording: a recitation of the beloved nursery rhyme "Mary Had a Little Lamb." That was the first time in history that anyone heard a previously recorded voice!

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His work team

Image: The National Library of Norway

It seems that Edison had a tendency for affectionate nicknames and monikers.

Edison didn't reserve nicknames just for his children; he also gave them to the members of his large staff. Many people worked in Edison's famous laboratory at Menlo Park, which he referred to as his "invention factory." Engineers, scientists, technicians, and people with different kinds of expertise gathered there to help make the great inventor's ideas possible. Edison affectionately referred to them as his "muckers," a nickname that shows not only his sense of humor but also his strong team spirit.

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His health

Image: Dan Meyers

One of the best-known aspects of Edison's health was his hearing loss when he was very young. Contrary to what one might think, Edison stated that this fact didn't negatively affect his career development. In fact, he believed it helped him focus and dedicate more time to his inventions and discoveries.

However, as an adult, he developed some other health problems. Some sources suggest that Edison's habits, including long hours in the lab and a poor diet, contributed to health issues like heart problems and diabetes.

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His last words

Image: Jonathan Borba

Edison's life was full of adventures, discoveries, love, and many other things. The American inventor didn't abandon his creativity even when it was time for him to leave this world.

It's said that, at the age of 84 on his deathbed, Thomas Edison looked at his wife, Mina, and uttered the words, "It's very beautiful over there."

While it's difficult to make a unique interpretation of these nice and calm words, their poetic and inspirational character is undeniable.

1

What are bills made of?

Unlike other currencies, dollar bills are not made of paper or plastic. U.S. dollar bills are made from a special fabric blend composed of 75% cotton and 25% linen. This mix makes the bills extremely durable and resistant, and they can be folded about 4000 times before tearing.

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What bills are valid?

Any U.S. dollar bill that was legally printed is valid, no matter how old, as American currency does not have an expiration date. While some bills might not be accepted by businesses of foreign exchange services due to their condition or if they are a discontinued version of the bill, the bills themselves are still valid, and American banks will accept them, though they might take them out of circulation.

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American leaders

Five bills have a depiction of an American president. The exceptions are the $10 bill, with Alexander Hamilton on the front, and the $100 bill, with Benjamin Franklin. The $1 bill, depicting George Washington, is extremely symbolic: several elements are repeated 13 times as a nod to the thirteen colonies, and it showcases the Bald Eagle and the Eye of Providence as a sign of God watching over America.

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A change in size

Did you know that dollar bills used to be so big that they were nicknamed "horse blankets"? Original dollar bills were 7.4 × 3.1 inches. In 1929, the Treasury Department reduced the size of bills to 6.14 × 2.61 inches to reduce production costs and materials. Old bills, though still valid, are worth much more as collector items.

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Uniformity

Besides their value and design, all dollar bills have the same size (6.14 × 2.61 inches), color, and weight (1 gram) , which sets American currency apart from other countries where bills of different values are differentiated by size, color, or both. Why doesn’t the U.S. implement differences among bills? The cost of adapting vending machines, bank drawers, and ATMs to new bill sizes would cost billions of dollars.

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Hard to copy

Originally, dollars were not green, but black. As time passed, green ink was favored, as it was cheap and did not fade as much as black. The new color also prevented people from using black-and-white cameras to create counterfeit money. Currently, dollar bills are predominantly green, but newer versions also include extra colors, such as pink, orange, or purple.

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A $100,000 bill?

Have you ever seen a $500 or 1,000 dollar bill? What about a $100,000? Up until 1945, the U.S. Treasury printed $500, $1,000, $5,000, $10,000, and $100,000 notes , in addition to the values currently in use. These higher-value notes were mainly intended for bank and government use, but were sought by criminals as they made it easier to hide large amounts of money. Even though they were officially discontinued in 1969, these notes are still valid, though rare, and they have a high worth as collector's items.

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No numbers

Unlike bills, American coins have different sizes and colors related to their value. Originally, gold, silver, and copper were used for coins, but modern coins are made of copper, zinc, or nickel. Besides their size and design, the value of each coin is printed in letters, not in numbers , alongside depictions of American presidents.

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Liberty for all (the coins)

By law, all American coins must include six specific details : the word ‘Liberty’, the name of our country, the national motto "In God We Trust", the oldest American motto "E Pluribus Unum", the value of the coin, and the year. Each coin also includes a mint mark that shows where it was made: "P" for Philadelphia, "D" for Denver, "S" for San Francisco, and "W" for West Point.

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A global currency

The American dollar is one of the most powerful currencies in the world, acting as a backbone for international trade and finances. It is estimated that two-thirds of the physical dollars in circulation are outside American territory. Besides the U.S. and its territories, eight sovereign nations have the U.S. dollar as their official currency, with several more accepting it as legal tender.

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There's an unexplained billion-year gap

Look closely at the canyon walls, and you'll notice something strange: a clean, sharp line where ancient rock simply stops, and a much younger layer begins directly above it.

This geological puzzle is called the "Great Unconformity," and it represents over a billion years of rock layers that are simply absent , as though that stretch of time never happened. In some spots, rock dated 1.8 billion years old sits directly beneath rock that is only 520 million years old. Where did the missing billion years go?

The leading theory involves the violent breakup of an ancient supercontinent, but scientists are still piecing it together.

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During the Cold War, it hid a nuclear fallout shelter

During the Cuban Missile Crisis in 1962, the U.S. government converted part of the Grand Canyon Caverns into a fallout shelter. This dry cave system, more than 200 feet underground, was stocked with enough food and water to sustain 2,000 people. Naturally, it was never occupied, and the supplies were never used.

The caverns have since been transformed into a tourist attraction, with organized tours winding through the same underground chambers that were once intended as a refuge from nuclear war. You can even book a night's stay there.

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The Federal Aviation Administration was founded after a crash over the canyon

In 1956, two commercial passenger planes collided in midair over the eastern Grand Canyon, killing all 128 people on board both crafts. Rescue teams struggled to reach the wreckage deep inside the canyon, and the extreme heat of the crash had caused the planes' aluminum to fuse with the bedrock. There were no survivors.

The disaster exposed a terrifying truth: the U.S. air traffic control system was dangerously outdated, relying on pilots' visual estimates and rough guesswork from controllers , with no way to separate fast-moving aircraft from slow ones, or instrument-flying planes from those navigating by sight. Congress responded by passing legislation that created both the Federal Aviation Administration (FAA) and the National Transportation Safety Board.

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A hoax suggested that an Egyptian civilization had lived there

In 1909, the Arizona Gazette reported that an explorer named G. E. Kinkaid had discovered a vast underground citadel inside the canyon, filled with artifacts linked to ancient Egyptian civilization. He even claimed the expedition had been funded by the Smithsonian.

This story described hieroglyphics on the walls, mummies in the chambers, and relics pointing to a direct connection with the Egypt of the pharaohs. It was incredibly detailed, and it was, of course, a hoax. No evidence for any of Kinkaid's claims ever surfaced.

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Fewer than 100 people have ever hiked its full length

Among the few people who have completed the through-hike of the Grand Canyon is Jen Hogan, the first woman to accomplish it, finishing her journey in 2021–2022.

It’s a full 800-mile length below the rim. The route involves extreme heat, flash floods, near-impassable areas, and stretches with no water or trail whatsoever. Around 60 or 70 people have reportedly accomplished it. This makes it one of the most exclusive feats on Earth.

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The Grand Canyon's rocks predate dinosaurs entirely

Visitors scanning the canyon walls for fossils are often surprised to learn they won't find any dinosaur bones here. The rock layers of the Grand Canyon are simply older than dinosaurs. This fact alone can be shocking: staring at its walls means staring at marine fossils from as far back as 1.2 billion years ago. Some of its caves hold the remains of ancient mammals. The canyon is a window into a world that existed long before the dinosaurs, when the land that is now Arizona lay beneath a shallow sea.

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The park is bigger than Rhode Island

Numbers alone rarely capture the Grand Canyon's scale, so here's a different approach. Rhode Island covers about 1,214 square miles, and the Grand Canyon National Park spans 1,904 square miles.

The canyon's depth exceeds four Empire State Buildings (which is 1,454 feet) stacked on top of one another. That’s 6,093 feet at its deepest point.

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But it's not the deepest canyon on Earth

For all its grandeur, the Grand Canyon does not hold the depth record. Pictured above, the Yarlung Tsangpo Grand Canyon in Tibet, China, plunges to 17,567 feet, which is nearly three times deeper. Carved by the Yarlung Tsangpo River as it cuts through the eastern Himalayas, that canyon is so remote and extreme that it remained largely uncharted until the late 20th century.

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It is home to a pink rattlesnake found nowhere else on Earth

The Grand Canyon Pink Rattlesnake has a pinkish-red coloring that matches the canyon's own distinctive rock walls so closely that it's nearly invisible. It is found nowhere else in the world. Officially classified as Crotalus oreganus abyssus , it has darker diamond-shaped markings along its back that deepen the camouflage further.

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There's a village at the bottom: Supai Village

For over 1,000 years, the remote village of Supai has been home to the Havasupai Tribe, the People of the Blue-Green Waters. It is located an eight-mile hike from the rim, but sits roughly 3,000 feet deep inside the Grand Canyon.

The U.S. Department of Agriculture has called it the most remote community in the contiguous United States, and it has no automobiles and no road access. The only ways in are on foot, by mule, or by helicopter. It is also the only place in the United States where the postal service still delivers mail by mule train.