17 Hidden Features of Everyday Objects You Never Knew About

We interact with everyday objects routinely, but do we truly understand their full potential?

Over years of testing household items and appliances in real-world scenarios, we've uncovered clever designs that enhance safety, efficiency, and convenience.

What if many of these familiar tools have hidden functions that transform how you use them?

These thoughtful engineering details prove how well-designed everyday items really are.

Contents

• 1. Your oven knobs can be adjusted to indicate the temperature more accurately
• 2. The little metallic buttons on your jeans are far from useless
• 3. The arrow next to the fuel gauge indicates which side the tank is on
• 4. Speaking of fuel, here's another hidden function of fuel pumps...
• 5. This is what the little lines at the bottom of your tire grooves are for
• 6. Do you know what the metal end of your tape measure is for?
• 7. The hole that allows you to hang your pots and pans is also used to put a wooden spoon
• 8. What are those little pieces of fabric that come with new clothes for?
• 9. The Tic Tac boxes have a small receptacle that allows you to take out only one dragee at a time
• 10. Some medicine bottles have a childproof lock that you can remove
• 11. Some screwdrivers are designed to work with a key
• 12. And what are those little holes on the side of Converse sneakers for?
• 13. Ok, but what are the holes at the top of running shoes for?
• 14. And that little black grill above your microwave, do you know what it's for?
• 15. The small hole in the caps of the pens does nothing to help the ink of the pen...
• 16. And those little raised lines on the "F" and "J" keys on your keyboard?
• 17. The small holes in airplane windows have a very specific function... and even two!

These unknown functions are genius solutions for safer, more efficient use—backed by practical testing.

Here are the 17 Secret Uses of Everyday Objects. Our top picks:

1. Your oven knobs can be adjusted to indicate the temperature more accurately

Sick of burnt pizzas or undercooked cakes? Most oven knobs are adjustable for precision.

Here's how: Preheat to 150°C and verify with a reliable oven thermometer.

Remove the knob by pulling it off. On the back, adjustment screws let you calibrate the dial.

Tighten or loosen until it matches the exact temperature. Simple and effective.

Awesome tip from hands-on kitchen testing.

To discover: Baking:Our Guide To Converting Temperatures To A Thermostat.

2. The little metallic buttons on your jeans are far from useless

These are rivets, a key innovation by Levi Strauss, jeans' inventor.

Early seams tore at pockets and flies under workers' stress, so copper rivets reinforce stress points for durability.

Proven over decades of wear.

To discover: 9 Essential Tips For Those Who Wear Jeans.

3. The arrow next to the fuel gauge indicates which side the tank is on

This arrow shows your gas tank's location—handy for rentals or forgetting your own car.

No more guesswork at the pump.

To discover: 17 Effective Tips To Use Less Gas.

4. Speaking of fuel, here's another hidden function of fuel pumps...

Gas nozzles detach safely via magnetic catch, preventing damage if driven off accidentally.

Smart engineering for real-world mishaps.

To discover: 20 Genius Tricks For Your Car.

5. This is what the little lines at the bottom of your tire grooves are for

Tire wear bars indicate the 1.6 mm legal minimum tread depth—replace when flush.

More accurate than coin tests; ensures safety and compliance.

To discover: 36 Ingenious Ways to Repurpose Old Tires.

6. Do you know what the metal end of your tape measure is for?

This hook serves three purposes:

#1: Notched for marking surfaces without a pencil—ideal for quick jobs.

#2: It slides 1 mm to account for its thickness—accurate inside/outside measurements.

Extends for external (e.g., walls); retracts for internal.

#3: Hole (eye) hooks onto nails/screws for stable measuring.

To discover: The Fun Trick to Turn your iPhone into a Measuring Ruler in 30 Seconds.

7. The hole that allows you to hang your pots and pans is also used to put a wooden spoon

Primarily for hanging, it also rests spoons to prevent spills.

Spaghetti spoons' center hole measures one serving precisely.

To discover: 50 Super Cooking Hacks Tried and Approved.

8. What are these little pieces of fabric that come with new clothes for?

Not for repairs—they test colorfastness with new detergents or removers.

Store near your washer to protect garments.

To discover: Washing Labels:Finally a Guide to Understanding Their Meanings.

9. The Tic Tac boxes have a small receptacle that allows you to take out only one dragee at a time

Dispenses one at a time—practical portion control.

To discover: 16 Simple Tricks To Reduce Your Plastic Waste.

10. Some medicine bottles have a childproof lock that you can remove

For U.S./Canadian bottles: Flip cap and reinsert inverted to bypass safety (if threaded).

Caution: Only if no kids nearby; store sealed, light-protected.

To discover: The Black List of 39 Dangerous Medicines FOR YOUR CHILDREN.

11. Some screwdrivers are designed to work with a wrench

Hexagonal handles fit wrenches for extra torque in tight spots.

To discover: How to Unscrew a Screw Whose Head is Damaged? The Little Tip to Know.

12. And what are those little holes on the side of Converse sneakers for?

Ventilation primarily, but originally laced for basketball stability.

Now iconic style. Click here to watch this technique on video.

To discover: 9 Tricks To Stop Your Shoes From Smelling.

13. Ok, but what are the holes at the top of running shoes for?

Custom lacing for fit, heel lock, or injury accommodation—boosts comfort and performance.

To discover: The Techniques You Need To Know For Properly Lacing Your Running Shoes.

14. And that little black grill above your microwave, do you know what it's for?

Faraday cage retains microwaves for efficiency and safety; blocks phone signals too.

(Don't heat phones!) Non-ionizing, no health risks.

To discover: 12 Things You Should NEVER Put In The Microwave.

15. The small hole in the caps of the pens does nothing to help the ink of the pen...

Safety vent prevents choking if swallowed—vital for kids who chew caps.

To discover: The Genius Trick To Reactivate A Ballpoint Pen That No Longer Writes.

16. And those little raised lines on the "F" and "J" keys on your keyboard?

Home row guides for touch-typing—feel your way without looking.

To discover: Do you use GMAIL? These Keyboard Shortcuts Will Save You CRAZY TIME!

17. The small holes in airplane windows have a very specific function... and even two!

Primary: Pressure equalization during ascent. Secondary: Defogs panes.