12 times science messed up—and created something incredible

Image: Talha Hassan

Innovation often comes from the most unexpected places. Some of the world’s greatest discoveries and inventions were not the result of a planned experiment but rather accidents, mishaps, or just serendipity. From the creation of irreplaceable household items to revolutionary medical breakthroughs, these chance discoveries changed history. Here are 12 remarkable things invented or discovered purely by accident.

Image: Sandy Millar

In 1928, Alexander Fleming discovered penicillin when he accidentally left a petri dish of Staphylococcus bacteria uncovered. A spore of mold landed on it, killing the surrounding bacteria.

Intrigued, Fleming continued experimenting with the mold, leading to the development of antibiotics that have saved millions of lives and continue to combat infections today.

Image: CDC

In 1895, Wilhelm Röntgen discovered X-rays while experimenting with cathode rays in a dark lab. He noticed that a nearby fluorescent screen began to glow even though it wasn’t directly in the path of the rays.

This accidental finding led to the development of X-ray technology. Röntgen's discovery opened the door for modern diagnostic imaging and is still widely used in hospitals worldwide.

Image: The Oregon State University Collections and Archives

In 1945, engineer Percy Spencer accidentally discovered microwaves' cooking potential when a chocolate bar in his pocket melted while he was working on radar technology.

He then experimented with popcorn kernels, further realizing the power of microwaves for cooking. This serendipitous discovery led to the microwave oven, which became a staple of modern kitchens.

Image: Imthaz Ahamed

Charles Goodyear stumbled upon vulcanized rubber in 1839 when he accidentally dropped a mixture of rubber and sulfur onto a hot stove. The heat caused the rubber to harden and become more durable, which led to the invention of vulcanized rubber.

Vulcanization makes rubber stronger and more elastic, and the process is still used today in products ranging from tires to waterproof clothing.

Image: Ian Talmacs

In 1826, chemist John Walker accidentally invented the first friction match when he scraped a chemical-coated stick on his hearth and saw it ignite. He had been experimenting with creating a new type of explosive but instead stumbled upon a practical way to create fire.

Walker’s matches were the first to be struck on any rough surface, paving the way for modern safety matches.

Image: Hugo Rocha

In 1968, 3M scientist Spencer Silver was trying to create a super-strong adhesive but instead developed a weak one that could easily be removed.

Years later, his colleague Art Fry applied this adhesive to paper and created the now-iconic Post-it Note. Who could have guessed that a bad adhesive could become so popular?

Image: Rob Wicks

In 1938, chemist Roy Plunkett was researching refrigerants when he accidentally discovered Teflon. While he was trying to make a new refrigerant, the gas he was working with turned into a solid, creating a slippery substance that was non-reactive and heat-resistant.

Teflon’s unique properties made it perfect for non-stick cookware. It also found uses in industries ranging from aerospace to electronics, making it a critical material in modern technology.

Image: Carrie Borden

In 1903, French chemist Édouard Bénédictus discovered safety glass by accident. After dropping a glass flask coated with plastic, he noticed that it cracked but didn't shatter.

This led to the invention of laminated safety glass, which is now standard in car windows and other safety applications, and has saved countless lives by preventing dangerous shards from flying during an impact.

Image: Giorgio Trovato

In 1942, Dr. Harry Coover accidentally invented Super Glue while attempting to create a clear plastic for gun sights. He discovered that the substance he had created was incredibly sticky, but too sticky for its intended purpose. The compound, called cyanoacrylate, was shelved for being too impractical at the time.

However, when the remarkable adhesive properties of the substance were later re-examined, it was commercialized under the now-ubiquitous name "Super Glue" and quickly became a household staple for all kinds of quick fixes.

Image: Call Me Fred

In 1907, Leo Baekeland discovered the first synthetic plastic while trying to create a synthetic substitute for natural rubber. His accidental combination of phenol and formaldehyde led to a substance that was heat-resistant and very durable.

In fact, Bakelite marked the beginning of the plastic age. It revolutionized manufacturing worldwide, allowing the creation of everything from household items to electrical components.

Image: jesse orrico

In 1956, engineer Wilson Greatbatch accidentally invented the pacemaker while attempting to build a heart rhythm recording device. By installing the wrong resistor, he unknowingly created a device capable of regulating heartbeats.

Who would have thought that a simple circuit mix-up would lead to such a revolutionary medical breakthrough?

Image: Alexander Grey

In 1879, chemist Constantin Fahlberg accidentally discovered saccharin while working with coal tar derivatives. He forgot to wash his hands and later noticed a sweet taste on his fingers.

Curious, he traced the unusual taste back to his experiment and recognized the potential of the new substance. Saccharin went on to become the first artificial sweetener, still widely used today in diet sodas and sugar substitutes.

The universe revealed

Did you know that the moon is upside down in the southern hemisphere?

Did you know that everything we know about the universe makes up only about 5% of it? Even so, there’s still much that might surprise you. On some planets, a year is shorter than a day, while on others it can literally rain diamonds. From the smell of comets to the color of Mars’ sunsets, here are 10 incredible facts about the universe you probably didn’t know.

Perhaps if the Weather Girls had been born on Neptune or Uranus, their famous hit might have had a very different title, because something extraordinary may happen on these planets: it can rain diamonds! The immense pressures in their atmospheres can compress carbon into diamond crystals, which then sink deeper into the planets’ interiors.

If you are reading this at night, step out into your backyard and take a look at the Moon. While we often assume everyone sees the Moon the same way, that’s not true. In fact, the Moon appears "upside down" in the Southern Hemisphere. This happens because your perspective changes relative to the Moon: in the Northern Hemisphere, you’re viewing it from "above" the equator, while in the Southern Hemisphere, observers see it from "below."

Saturn, the second-largest planet in our solar system, has a diameter of about 74,897 miles, making it roughly nine times wider than Earth. Surprisingly, it’s theoretically possible for Saturn to float on water... if only you could find an ocean big enough! This isn’t because of its size, but because of its composition: the planet is mostly made of hydrogen and helium, extremely light gases that make Saturn less dense than water.

Remember that time you got distracted and the steak on the stove got a little burnt? Surprisingly, the smell in your kitchen isn’t too different from what astronauts report after spacewalks. Scientists have noticed that objects returning from space, especially those exposed to the vacuum outside the spacecraft, carry a distinctive odor often described as burnt steak or welding fumes.

It takes Earth about 365 days to orbit the Sun, which is why our year is that long. A day, on the other hand, lasts just 24 hours because that’s how long it takes Earth to complete one full rotation on its axis. But on Venus, things work very differently. A single day on Venus (the time it takes to rotate once on its axis) is about 243 Earth days, making its rotation extremely slow. Surprisingly, a year on Venus is shorter than its day, because it only takes about 225 Earth days for Venus to orbit the Sun. Incredible, isn’t it?

Since we see the Moon in the sky nearly every night, it’s easy to forget that it’s a giant rock floating far away in space. In fact, the distance between Earth and the Moon is about 238,900 miles, so vast that, in theory, you could line up all the other planets in our solar system across that gap!

Mars is famously called the "Red Planet" because its surface is covered in iron oxide (rust), giving it a reddish appearance from afar. But if you were standing on Mars at sunset, you’d get a surprise: unlike Earth’s warm orange, gold, and pink hues, Martian sunsets appear blue. This happens because the planet’s thin, dusty atmosphere scatters sunlight differently, allowing blue light to dominate near the Sun at sunset.

Comets, made of ice, dust, and frozen gases, are truly spectacular to see. But if you could smell them, they might not be so pleasant. As a comet nears the Sun, its ices sublimate, turning directly from solid to gas and releasing various compounds. Among these are sulfur-containing gases, which give off a strong rotten-egg smell.

Scientists can estimate the number of stars in the universe using observations and projections. Astronomers observe a small patch of the sky, count the galaxies and stars there, and then extrapolate those numbers to the entire observable universe. While Earth has an incredible number of sand grains, these calculations suggest that there are far more stars than grains of sand. If you're not impressed yet, remember that many of those stars are much larger than any planet!

If the last fact shocked you, this one will totally blow your mind. While our galaxy has far fewer stars than the entire observable universe, you might be surprised to learn that trees on Earth actually outnumber the stars in the Milky Way. That’s right! Scientists estimate there are roughly 3 trillion trees on our planet, while the Milky Way contains only about 100 to 400 billion stars.