Secret uses

This is how a tiny hole in an elevator door can save your life

You’ve probably twisted a bread bag closed, filled up your car, or pulled a sheet of aluminum foil from the box thousands of times without giving it a second thought. But many of the everyday objects we’ve used for decades have clever features that most people never notice. From the tiny pocket on blue jeans to the little arrow next to your gas gauge, these hidden designs have practical stories behind them, and once you know them, you’ll never look at these familiar items the same way again.

If you own an iPhone, you’ve probably noticed the tiny black dot next to the rear camera. It’s small, so people tend to assume it’s another camera sensor or even part of the phone’s design. The small hole found near the camera bump on every iPhone is actually a rear microphone.

It captures clearer audio when you’re recording videos and helps reduce background noise during FaceTime and regular phone calls. If you own an iPhone Pro model from the iPhone 12 Pro onward, you'll also see a larger dark circle. That’s the LiDAR scanner, which sends out invisible infrared light to create a 3D map of your surroundings. It helps the camera focus faster in low light, powers Apple’s Measure app, and makes augmented reality features much more accurate.

Whether it's a holiday dinner, an anniversary, or simply a nice meal with friends, you’ve probably held a wine bottle and noticed the deep indentation in the bottom. Many people tend to think the deeper the indent, the fancier the bottle.

That indentation is called a punt, and it’s been a part of the bottle-making for centuries. Originally, it helped strengthen hand-blown glass bottles, making them less likely to crack under pressure. Today, it still adds structural stability, particularly for sparkling wines, while also giving servers a comfortable place to rest their thumb when pouring, though some say it helps collect the sediment as wines age. In any case, a deeper pun doesn’t automatically mean a better or more expensive bottle.

Almost every driver has experienced that awkward moment at the gas station. You pull up to the pump, step out of the car, and suddenly realize the fuel door is on the opposite side.

To help prevent exactly that situation, many modern vehicles include a small arrow next to the gas pump symbol on the dashboard’s fuel gauge. The arrow points towards the side of the vehicle where the fuel filler door is located. It’s a small detail on the dashboard, yet once you notice it, you’ll never have to circle the pump again.

All elevators look pretty much the same. Bigger or smaller, they all look similar, a gray box with a mirror and buttons. But if you pay close attention, you may notice there’s a small round opening near the top of the door.

That opening is a keyhole used by trained maintenance technicians and emergency responders. With a special elevator key, they can manually unlock the landing doors when repairs are needed or if passengers become trapped inside. The system allows professionals to reach the elevator safely without damaging the doors or relying solely on electrical controls. Hopefully, most of us will never need to see it in action. But in an emergency, that tiny opening becomes one of the most important parts of the system.

If you’ve ever stood in the bread aisle comparing loaves, you’ve probably noticed the colorful plastic clips or twist ties holding the bags shut. Contrary to what many think, they’re not simply a part of the packaging.

For many bakeries and grocery stores, the colors indicate the day a loaf was delivered or baked. While the exact color schedule can vary between bakeries and regions, employees use the system to quickly spot older inventory and rotate fresher bread to the back of the shelf. That way, customers are more likely to pick up the freshest loaf available.

Whether you wear jeans every day or only pull them out for yard work, you’ve probably noticed the tiny extra pocket tucked inside one of the front pockets. It’s too small for a phone and not very useful for loose change, but there’s a reason for it.

Back in the 1800s, when Levi Strauss & Co. created rugged denim pants for miners, ranchers, and cowboys working across the American West, pocket watches were commonplace. Workers needed a safe place to carry their watches while riding horses, so that little pocket was designed specifically to protect the watch from damage. Pocket watches disappeared, but the tiny pocket became such an iconic part of blue jeans that manufacturers have continued including it for well over a century.

Almost everyone has had the same frustrating experience. You pull on a sheet of aluminum foil, and suddenly the entire roll slides out of the box and lands on the kitchen counter.

That’s exactly why major manufacturers such as Reynolds introduced the small side tabs, known as end locks, in the mid-1990s. By pressing the tabs inward, they hold the cardboard roll in place like built-in axles. This keeps the roll from sliding out of the box, makes it much more stable as you pull, and helps the serrated edge cut a cleaner, straighter sheet. It also reduces waste by preventing the foil from bunching up or tearing unevenly. It’s a simple design, yet useful as it can get.

Every household has pens lying around for all kinds of purposes. And most of them have a common feature, a hole in the cap, which isn’t simply part of the design.

BIC and other pen manufacturers included the opening as a safety feature. If someone, especially a child, accidentally swallows a pen cap, the hole can allow a small amount of air to pass through, reducing the risk of complete airway blockage while emergency help is on the way. The design became part of border efforts to improve consumer product safety after choking incidents drew attention to the danger of small plastic objects.

If you grew up sewing or watching somebody do it, you probably remember the classic tomato-shaped pincushion sitting beside the sewing basket. Hanging from it was a tiny red strawberry that looked like nothing more than a cute finishing touch.

In reality, that little strawberry has its own job. Instead of soft stuffing, it’s filled with emery, a gritty material made from crushed abrasive minerals. Running pins and needles through it helps polish away tiny spots of rust, smooth rough edges, and keep the points sharp enough to glide through fabric more easily.

Think back to the first time you learned to type. Maybe it was at work, or on a family computer. Wherever it was, someone probably told you to keep your fingers on the "home row." That’s exactly why the F and J keys have tiny raised ridges.

The bumps let your index fingers find the correct starting position by touch alone, allowing you to type without constantly looking down at the keyboard. The technique, known as "touch typing," is widely credited to American court stenographer Frank Edward McGurrin, who demonstrated it in 1888. As typewriters became more common, manufacturers experimented with different ways to help typists orient their hands, and by the mid-20th century, companies such as IBM standardized the subtly raised plastic bars that remain on nearly every keyboard today.

Vocabulary traps

Lost in translation: 10 everyday words that mean the opposite elsewhere

Image: Gabrielle Henderson

They look familiar, sound familiar—but don’t trust them! "False friends" are words that exist in multiple languages but have wildly different meanings. These linguistic traps confuse travelers, mislead translators, and embarrass even fluent speakers. Here are 10 of the most common—and surprising—false friends across languages.

Image: Kira auf der Heide

German vs. English

In English, a "gift" is a present. But in German, gift means poison. You can imagine how that could lead to some awkward moments.

The word actually comes from a shared root: in Old High German, gift meant "something given," but evolved into "poison" in German due to its use in poisoning cases. Meanwhile, English kept the benign sense of giving.

Image: Jimmy Nilsson Masth

Spanish vs. English

In Spanish, sensible means "sensitive," not reasonable or practical. This is a classic false friend stemming from the Latin root sensibilis, meaning "capable of feeling."

However, the English version of the word diverged toward a notion of practicality in the 18th century, while Spanish retained the original emotional nuance of the word.

Image: Ben Wicks

French vs. English

In French, actuel means "current" or "present," while in English, the word "actual" is used to describe something real or factual.

Both words stem from Latin actualis, but English shifted toward meaning "real" by the 17th century.

Image: Or Hakim

French vs. English

In French, chef means "boss" or "leader," and not necessarily a cook. Chef de cuisine is a kitchen boss, and that was shortened in English to just "chef" for cooks.

For example, a chef de projet in French manages a project, not a restaurant kitchen.

Image: Joyce Romero

French vs. English

A fabrique in French is a factory, not a textile or cloth. The root is Latin fabrica, meaning a workshop or place of making.

While English narrowed the meaning to "cloth" by the 15th century, French kept the industrial sense.

Image: Kelly Sikkema

Spanish vs. English

In Spanish, embarazada means "pregnant"—not embarrassed. A classic fumble among early Spanish learners, the similarity can be confusing at first.

Both words trace their roots to the Latin imberbes (unbearded), later evolving into "embarrassed" in English via French.

Image: Caroline Hall

French/German vs. English

In French (éventuellement) and German (eventuell), it means "possibly," not "finally."

While the English word implies inevitability, in French and German it expresses uncertainty. All three share the Latin eventus ("outcome"), but diverged by the 18th century.

Image: Toa Heftiba

French vs. English

In French, assister means "to attend." The word is derived from Latin assistere, which literally means "to stand by." French remained closer to the original meaning, while English shifted toward the sense of aid.

Image: Priscilla Du Preez

French/Spanish vs. English

In both French (sympathique) and Spanish (simpático), the word means "nice" or "friendly," not emotionally compassionate.

All come from Greek sympatheia, meaning "shared feeling." English leaned into the emotional depth, while Romance languages simplified it to likability.

Image: The Jopwell Collection

French vs. English

In French, collège is middle school, not higher education.

The root for both words is the same, from the Latin collegium, meaning "group" or "society." English changed it into university-level schooling, while French designated it for early teens (ages 11–15).