Discover the reasons for many clever design features!
Do you want to prevent someone from seeing something? Then put whatever it is right under their nose!
All right, we admit, inventors of these objects were not thinking in this way, but our inattention sometimes leads us to completely ignore the usefulness of the devices we use virtually every day!
If we would sometimes let ourselves be carried by curiosity, then we could easily discover some very interesting and useful things, just like the ones we explain here.
The tiny hole at the bottom or on the side of an airplane window
It is used to balance the enormous air pressure difference between the outside and inside of the airplane and to avoid fogging up the window glass.
The extra piece of fabric that is sold with new clothes
The main purpose is not to be used as an emergency repair patch, but to test detergents or dry-cleaning fluid before applying them to the new article of clothing.
The small pocket on a pair of jeans
In fact, this small pocket on a pair of jeans is a leftover legacy of tradition --- it was introduced to insert the pocket watch (and not the cigarette lighter!).
The holes on the sides of the All-Stars sneakers
The most obvious purpose is foot ventilation, but tradition also plays its part! When All-Stars are used on the basketball court, these holes allow players to pass the shoelaces through the openings for a better and tighter hold.
The hole and the serrated bottom edge of the end hook on a tape measure
The hole is used to hook the tape measure to a screw that can be used as a holder.
The serrated edge is used to make a mark, which indicates where the measurement ends.
The little arrow on a car's fuel gauge
Very useful, especially if you need to refuel and you are driving a car that is not yours --- in fact, that arrow indicates which side of the car the fuel cap is located.
The zigzag side of a bobby pin (hairpin)
The zigzag side of a bobby pin (hairpin) should actually be positioned downward so that by adhering to the scalp, it increases the grip of the bobby pin on your hair and prevents it from falling or sliding out.
The hole on the bottom of padlocks
This opening is a drain hole that is used to avoid moisture accumulation and to lubricate the internal lock mechanism.
The top end piece of a utility knife with segmented blades
When the tip of a blade on a utility knife wears out or becomes dull, it can be eliminated by snapping off that portion and immediately getting a new tip. To do this, just detach the plastic top end piece of the instrument and insert the tip of the worn out blade into the top end piece, and in this way, you can snap off the worn out blade tip safely.
The "wings" on the Apple Charger
The "wings" on an Apple charger are used to wrap the cord around them. In this way, the very first portion of the cord (which often tends to break) will remain safe and will be less damaged by twisting.
The concavity in the bottom of bottles of wine
The concavity in the bottom of the wine bottle is used to counterbalance the increase in pressure that occurs when the cork is inserted into the bottle.
The shape of a Tic-tac box lid
The Tic-tac box lid has a small dispenser that can hold a single Tic-tac candy.
The small hole near the iPhone camera
Maybe you have already arrived at the right answer!? It is the microphone that turns itself on when you use the rear camera.
The hole at the top of the BIC pen cap
Who has never chewed on a BIC pen cap? The hole is there specifically for that situation! In fact, if swallowed, due to the hole, a BIC pen cap cannot totally obstruct the passage of air and, perhaps, this will save your life!