Superstitious speech

The eerie belief behind saying "bless you" after a sneeze

We use phrases like "bless you" or "break a leg" every day, but have you ever stopped to wonder where they actually came from? Many of our favorite figures of speech are rooted in the old superstitions of our ancestors: fears, beliefs, and traditions that haven't quite faded away. Let’s uncover the fascinating, sometimes eerie, backstories behind 10 idioms we use all the time.

When someone sneezes, "bless you" is the automatic response. This tradition began in the 6th century, primarily thanks to Pope Gregory the Great, who ordered the saying of "God bless you" to protect people from the plague, as sneezing was considered an early symptom of sickness.

Some also trace it back to an ancient belief, shared across Europe and Asia, that a sneeze was the body's way of driving out evil spirits, or even the soul briefly trying to escape. According to the legend, saying "God bless you" was a quick, necessary prayer to protect the sneezer’s soul from being snatched by the devil before it settled back in.

"Cross your fingers" is a widely recognized way of wishing for a positive outcome. It originated in the 16th-century Christian practice of physically crossing one's fingers to signify the cross and invoke divine protection.

Over time, the hand gesture evolved from a silent, pious prayer into a casual expression. Now, we use it in everyday conversation to show support for a friend or to signal that we are banking on a specific, desired result during a stressful situation.

We use this expression when we wish someone good luck before they step on stage, or, more broadly, before any high-pressure moment.

The origins are surprisingly murky for such a well-known phrase. The most widely accepted theory traces it back to the competitive world of American vaudeville and Broadway in the early 20th century, where wishing someone good luck directly would actually invite bad luck. Saying the opposite was a way of outsmarting fate.

"Speak of the devil" is one of those phrases we use almost automatically. The moment someone walks into a room right after being mentioned in conversation, someone inevitably says it.

The expression is a shortening of a traditional English proverb, 'speak of the devil, and he shall appear,' which dates back to at least the 1500s-1600s. The original meaning was far less casual: it was a genuine warning rooted in the medieval Christian belief that speaking of evil, even in passing, was thought to invite it into your presence.

Imagine your boss is about to call on you to present a report you completely forgot to prepare, but just as he turns to you, an urgent call comes in, and the meeting gets cancelled. Being saved by the bell means to be rescued from a difficult situation at the very last second.

Due to a 19th-century custom, bells were attached to coffins to alert people in case someone woke up, reflecting the widespread fear at the time of being buried alive. It is a perfect example of a dark, historical anxiety morphing into a lighthearted, everyday piece of office humor.

There's no single definitive origin story or specific text where this expression first appeared. It likely evolved organically from the general cultural association between wind and chaos. Today, the expression means to act recklessly or boldly, ignoring risks.

The phrase draws from a long tradition of wind-related idioms in English that associate wind with unpredictability and lack of control ("gone with the wind," "which way the wind blows," etc.).

In seafaring culture, "throwing caution to the wind" may also connect to the idea of sailing recklessly by putting up too much sail despite dangerous conditions: essentially letting the wind take over rather than navigating carefully.

The phrase "it must be a Friday the 13th" has become an idiomatic way to complain about a day when everything goes wrong. It draws on the combined superstitions surrounding the number 13, often linked to the 13 guests at the Last Supper (1st century AD), and the perceived misfortune of Friday, the day of the Crucifixion. When we use this expression, we aren't necessarily expressing deep fear; we are simply using a culturally shared shorthand to describe a series of unfortunate, coincidental events.

We often use the idiom "like walking through a minefield" to describe a social situation that is incredibly tense and fraught with hidden dangers. While it sounds like a literal warning, it has become a common expression for navigating tricky interpersonal politics. The phrase originated in the early 20th century, specifically around World War I (circa 1915), when the use of landmines became a terrifying new reality of modern warfare. It quickly shifted from a military term to a popular metaphor.

"Find a penny, pick it up, and all day long you’ll have good luck" is an idiomatic rhyme that turns a mundane discovery into a superstitious event. The underlying belief likely traces back to ancient societies across Europe and Asia, who saw metal as a sacred gift from the gods, forged from the earth itself. Finding a piece of it was no accident; it was a sign of divine favor. By the early 20th century, it evolved to include the penny. Today, reciting this idiom acknowledges our enduring, playful hope for a little extra luck.

When we say "knock on wood," we express an idiom to express a desire for continued good fortune or to ward off bad luck after boasting. It’s just a reflexive, superstitious way to keep the bad luck at bay, even if we’re only knocking on a laminated desk.

One popular theory traces it to ancient pagan cultures, particularly those that regarded trees as sacred or inhabited by spirits — a belief found across pre-Christian Europe, from Norse to Celtic traditions. By knocking on the trunk, people hoped to awaken these benevolent spirits to request protection, or sometimes to distract malicious ones from spoiling their good fortune. However, folklorists note there is little concrete evidence for this, and the true origin remains uncertain.

Facts you didn't know you needed

Is the day longer for your pet? Mind-blowing facts you need to know

Adults often assume they already understand the world, but there’s always something new to surprise us! Did you know that clouds actually have weight? Or that the day is longer for some animals? And that’s just the beginning. From hidden functions of your organs to the true color of the universe, today you’ll learn 10 fascinating facts you probably never thought to ask, but will make you sound impressively smart in your next conversation!

Unlike humans, animals don’t experience a shared "present" in quite the same way. Instead, their sense of time is tied to the rhythms of their own bodies. For very small animals with fast metabolisms like parrots, hamsters, or guinea pigs, time actually seems to pass more slowly. In a sense, they live in slow motion because their faster-working nervous systems allow them to process sensory information at a fast speed.

What if someone commits a crime and tries to blame their identical twin? Have you ever wondered about that? It’s a valid question; after all, identical twins not only look alike, they also share the same DNA. But here’s the surprising part: if investigators check fingerprints, the innocent twin could be cleared. That’s because, despite their nearly identical DNA, twins have unique fingerprints, shaped by subtle genetic and environmental factors in the womb.

You’ve probably spent time lying on the grass, watching clouds drift across the sky. They look light, fluffy, almost like cotton candy, and it’s hard to imagine them as heavy objects. But the truth is surprising: clouds are incredibly heavy. An average cumulus cloud can weigh around 1 million pounds! That impressive weight comes from the billions of tiny water droplets suspended in the air. So, how do they float? It’s because each droplet is extremely small and falls very slowly, while rising warm air currents help keep the cloud suspended above us.

Most of us have a rough image of the world map in our minds. But we have something to tell you: most maps aren’t completely accurate. Because the Earth is a sphere, cartographers have to distort some areas to represent it on a flat surface. On Mercator projection maps, countries near the poles appear much larger than they really are, while countries near the equator look smaller in comparison. For example, Alaska looks about the same size as Brazil, but in reality, Brazil is nearly five times larger!

Most people don’t realize that there’s actually a name for the color of the universe. Strange, right? But it’s true! Astronomers who studied the light from thousands of galaxies discovered that if you blend all the colors from the observable universe, the result is a soft, beige-ish white shade, famously named "Cosmic Latte" in 2002.

With 50 states, there’s no shortage of variety in their names. Almost every letter of the English alphabet appears at least once, except for one: Q, which is completely absent. In addition to this, there’s another surprisingly rare letter: J. While it isn’t entirely missing like Q, it only appears in one state, New Jersey.

Although we don’t notice it, indeed, the Earth’s rotation is gradually slowing. This happens because tidal friction, caused by the Moon’s gravitational pull on our oceans, creates a subtle drag on the planet’s spin. As a result, days are getting longer, but very gradually: by only about 1.7 milliseconds per century.

Do you remember your last dream? Whether good or bad, dreams are a constant part of sleep, but not everyone experiences them in the same way. Deaf people who use sign language in their daily lives often communicate through signs in their dreams, too. Meanwhile, blind people tend to have dreams rich in sounds, smells, and tactile sensations, using these other senses to experience the dream world.

We’re used to seeing hippos covered in mud, splashing in water, or barely peeking above the surface. But here’s a surprise: hippos can’t actually swim! That’s right. Because of their huge, heavy bodies, they don’t float or paddle like most animals. Instead, they walk or run along the riverbed.

Can your brain really "eat" itself? Well, close, but not exactly. There’s a process called phagocytosis, carried out by specialized immune cells in the brain known as microglia. These cells engulf and remove debris, dead cells, and other unwanted material. But don’t worry; it’s safe! The mechanisms exist to protect, repair, and maintain your brain.