10 everyday things, about the true purpose of which we did not know

We are surrounded by thousands of little things that we see so often that have become accustomed to them and not notice them. But have you ever thought about the true purpose of these things?

Here are some interesting examples that reveal secrets invisible to us devices.

A loop on the shirt back

There are three possible use case. The first and most obvious is to hang the shirt. A second, possibly stretches from the era when worn and detachable starched collars and ties that were more like scarves, and they had to fix. Perhaps this loop began to do just that.

The third option is unexpectedly romantic at an American University student, in a relationship with a girl, cut this loop in a sign that he's busy. And the girl, in turn, wore a scarf with the logo of his beloved University.

The cylinder on the wire of the charger

You have probably noticed this small cylinder on the charging cord from the laptop. This is a very important detail — ferrite. It suppresses high-frequency interference in electrical circuits.

The hole in the window of the plane

For the window in airplanes used several layers of transparent plastic, which form a kind of "glazed". Window to withstand tremendous loads and, in recent times are made from high strength acrylic plastic. The glass is not as durable and are made of the cheaper plexiglass. They serve for better noise and heat insulation of the cabin, creating an air layer between itself and the external window.

There is therefore a risk that in the event of a large pressure difference in the gap between the glass and the cabin internal "glass" can not withstand and burst. A small hole allows to normalize the pressure, removing excess air from the space between glass panes, or Vice versa.

The blue half of eraser

Ask anyone why the blue half of the eraser, and you'll answer: to erase ink pen. This is not entirely true. Initially, this half was designed to remove pencil construction paper. The pink part usually leaves traces by erasing the pencil to the end, but the blue gum removes everything.

The creators of this eraser soon realized that people didn't think to use a blue half on purpose, and decided that it was better to adapt and advertise the eraser is new.

Horizontal buttonholes

Another mystery shirts. Have you ever noticed that the hinges for the top and bottom buttons horizontal and the rest vertical? This is due to the fact that these two buttons are more likely to pop open. A horizontal loop will prevent them.

The extra holes on running shoes

Surely you have seen the extra holes on running shoes, wondering why so high pass the laces. In fact, these holes have been created in order to fix the footwear to the foot and prevent slipping and chafing when you exercise.

The hole in the spoon for spaghetti

Using the holes in the spoon for spaghetti, you can measure the amount of pasta for a standard portion.

Small pocket on jeans

The most frequent answer to the question of why a pair of jeans, make this small pocket — for carrying out there of contraceptives. Of course, in addition to condoms, this pocket will fit a lot of little things, but initially, it had a definite purpose. In 1873, Levi's jeans were issued with a designated spot for pocket watches.

The hole in the cap of a ballpoint pen

Many people suffer from biting the pen or cap. The hole in the cap is if a person accidentally swallows the cap and it stuck in my throat — then it will be possible to breathe through the hole until the foreign object is not removed.

Samples of the material in new clothes

In fact, these pieces are provided not in order to fix a hole in new clothes. It turns out that they need to try how to react to the material of your new shirts on the washing powder or bleach.