Behind popular wisdom

12 common sayings that don’t mean what you think

Image: Alexandra Fuller

We hear them daily and rarely question their meaning, but many popular sayings come from surprising origins—or mean something entirely different than we think. Some of these discrepancies are rooted in history, others in mistranslation, and more than a few in good old-fashioned misunderstanding. Here are 12 familiar phrases decoded and laid bare with real facts.

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The original version, a 12th-century German proverb—_"The blood of the covenant is thicker than the water of the womb"_—suggests chosen bonds (like friendship or military brotherhood) are stronger than family ties, the opposite of how it’s used today. This shift in meaning likely occurred in later times, as the abbreviated form entered popular speech.

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The full phrase is "Great minds think alike… and fools seldom differ." With the full version, the meaning turns ironic—it suggests that both geniuses and fools can agree just as easily, likely a warning against groupthink.

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This proverb is often used to warn against dangerous inquisitiveness, but the full version—_"Curiosity killed the cat, but satisfaction brought it back"_—adds nuance. It suggests that the reward of knowing can outweigh the risks of curiosity.

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The full phrase is "Jack of all trades, master of none, but oftentimes better than master of one." Originally, it praised versatility, not criticized it. The missing line completely flips the meaning, suggesting it’s often better to be well-rounded than narrowly skilled.

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This phrase meant an impossible task—just like lifting yourself by your own shoelaces. First recorded in the 1800s, it mocked absurd self-starting efforts. But by the 20th century, American individualism had flipped its meaning into a motivational mantra.

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The original phrase is "The proof of the pudding is in the eating," meaning you have to try something to know if it’s good. The modern shorthand makes little sense by itself and loses clarity but still hints at the original idea: results matter more than appearances.

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There are competing theories about this phrase’s origin. The most common links it to boxing radio commentary, where a losing fighter is "saved by the bell" at the end of a round. Others trace it to 18th-century burial customs, when the fear of being buried alive led to coffins being rigged with strings tied to bells aboveground.

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A popular myth claims the phrase "rule of thumb" stems from a law allowing men to beat their wives with sticks no thicker than a thumb. Fortunately, no such law ever existed. The phrase dates back to the 17th century and likely originated in trades where measurements were estimated using the thumb’s width or length.

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One theory about the origin of "cold turkey" links it to the clammy, pale skin that some people experience during withdrawal, said to resemble cold turkey meat. However, a more likely explanation is that it combines the earlier idiom "talking turkey" (meaning to speak plainly) with "cold," used to describe something abrupt or blunt.

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This phrase isn’t about feeling cozy—it refers to rope-strung beds from the 18th century. Back then, mattresses rested on a web of ropes that needed regular tightening. "Tight" meant the ropes were pulled firm to prevent the mattress from sagging.

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Though it sounds mythological, this phrase comes from early 1700s theater. Playwright John Dennis invented a new thunder sound effect for his play. After the show flopped, another theater used the effect without credit. Dennis famously complained, "They will not let my play run, but they steal my thunder."

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Before modern transportation, trade ships often got stuck in winter ice. So, smaller vessels were sent to break the ice and clear a path. Used since at least the 16th century, the original nautical context made it a natural metaphor for overcoming barriers.

The truth about your brain

You won’t believe what happens in your brain while you sleep

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Your brain is one of the most powerful and mysterious organs in your body. It controls everything from your thoughts to your emotions and even processes information at lightning speed. But how much do you really know about it? Some long-believed myths about the brain have been debunked, while other surprising facts reveal just how incredible this organ truly is. Get ready to be amazed by these fascinating brain facts!

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You’ve probably heard this one before, but it’s completely false! While it’s true that not all parts of the brain fire at the same time, imaging studies show that most regions are active throughout the day, even when we sleep.

Your brain is constantly working, controlling bodily functions and emotions, and processing information. So next time someone says you’re only using 10% of your brain, you can confidently tell them that’s just a myth!

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Here’s a weird fact: While your brain processes pain signals from the rest of your body, it has no pain receptors of its own. This is why surgeons can perform brain surgery on conscious patients without causing them pain.

However, the membranes and tissues surrounding the brain do have pain receptors, which is why headaches and brain injuries can be so excruciating.

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How come we have headaches if the brain has no pain receptors? Well, that’s because headaches are triggered by chemical activity in the brain, changes in nerves and blood vessels, and even fluctuating serotonin levels.

In some cases, hormones like estrogen can also play a role, which explains why migraines are more common in women.

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Dreams are proof that your brain never rests! (Warning: this fact can make you feel exhausted.) While you sleep, your limbic system, that is, the part of the brain that deals with emotions, becomes especially active, which is why dreams often feel so intense.

On average, humans experience four to seven dreams per night, even if we don’t always remember them. And what about that scary nightmare about falling? Well, you can thank your amygdala, the brain’s fear center, for that one.

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Have you ever walked into a room and instantly forgotten what you were after? That’s because short-term memory only lasts about 20-30 seconds! That’s not enough!

Your brain holds a limited amount of information in its active state before deciding whether to store it or discard it. Ironically, we can’t really choose what makes the cut, but we do hope these facts stay with you!

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That sharp, icy pain when you eat something too cold? It’s your brain’s way of telling you to slow down! Officially called sphenopalatine ganglioneuralgia, a brain freeze happens when cold food or drinks rapidly chill the blood vessels in your throat, causing them to constrict and then rapidly expand. This sends pain signals to your brain, warning you of the sudden temperature shift. It’s annoying, but it’s actually your body trying to protect itself!

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You didn’t need us to tell you, but let’s look at the details: The average person has between 12,000 and 60,000 thoughts per day. What’s even more interesting? 95% of those thoughts are the same ones you had yesterday. Is that not surprising enough? Hear this out: 80% of them tend to be negative. That’s because our brains are wired for survival, constantly analyzing risks and potential dangers.

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Even though it only makes up about 2% of your body weight, your brain employs a major quantity of energy! It consumes 20% of your oxygen and blood supply, making it one of the most demanding organs in your body.

If your brain goes without oxygen for just five minutes, brain cells start dying, leading to irreversible damage. This is why deep breathing and cardiovascular exercise are great for brain health!

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Do you know that feeling when you hit the back of your head and see stars? That’s because your occipital lobe, which controls vision, is located at the back of your brain. If you get hit there, your brain momentarily misfires, causing flashes of light.

Interestingly, your brain processes vision on the opposite side; while your right brain controls your left eye, your left brain controls your right eye. It’s one of the many ways the brain operates in a complex way.

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Believe it or not, your brain generates between 12 and 25 watts of electricity when you’re awake. If you can’t really grasp how powerful that is, check this out: It’s enough to power a small light bulb! Your brain’s electrical activity is what allows neurons to send signals at speeds of up to 260 miles per hour.

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Your brain may be the fattiest organ in your body, consisting of at least 60% fat! This is why consuming healthy fats, like omega-3s and omega-6s present in fish, for example, is essential for brain health.

Healthy fats stabilize brain cell walls, reduce inflammation, and support cognitive function. So go ahead and enjoy that avocado toast, it’s food for your brain!

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It’s not just your memory that fades over time; the brain itself physically shrinks as one gets older. It continues developing until your late 40s, but after that, it slowly decreases in size.

Now, size doesn’t equal intelligence, so a smaller brain doesn’t necessarily mean a less capable one. Staying mentally active, exercising, and eating brain-boosting foods can help keep it in top shape!

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We often think of cholesterol as bad, but your brain actually depends on it! In fact, 25% of your body’s cholesterol is stored in your brain, where it helps with learning and memory. However, unlike other organs, the brain can’t absorb cholesterol from the blood, it has to produce its own. So, while too much cholesterol in the body can be harmful, the right amount is vital for brain function. At least you can use that as an excuse to get that burger!