Not everything is as it seems, and the most surprising thing is that although we are used to interacting with all the elements that surround us in our daily lives, we probably don’t know some details about it, when you really care about something, you will start to notice small features It makes it easy for you to use, and your mind will start to wonder more about the meaning behind it and the reason for its existence, so “The Seventh Day” reviews several things that we know and see in our daily uses, but we do not know the reason for their existence, according to the website.Brightside” As follows:

Holes in Airplane Glass:

If you notice a small hole in the window of the plane you are traveling in, do not worry, there are two main reasons for those holes, the first is to compensate for the difference in air pressure with the change in altitude, and the second is to prevent fogging of the window.

Metal rivets in jeans

Rarely do you find someone who does not have two or more jeans, and you must have noticed that there are some metal buttons in addition to one or more rivets, the reason here is not because they make them look fashionable or “fashionable”, but because they work to prevent the jeans from unraveling, as the use of The thickening of the jeans makes them prone to rips, and to prevent this, small metal “rivets” are implemented in the common areas so as not to rip.

Jeans rivets

The hole in the pen cap

The small hole on the top of the pen cap is actually a safety feature, if you ever find yourself with a pen cap in your mouth, this little hole was made, because if you accidentally swallow the pen cap, this hole will let air through and prevent suffocation.

Margins in school notebooks

You may have noticed these margins in your notebooks. It was easy to assume that these margins might have helped us maintain structure on the page, but the truth behind the invention of these margins is much more interesting. In previous years mice were unwelcome guests in many homes around the world. And they ate paper, so that mice wouldn’t eat paper that contained important notes, manufacturers started leaving blank spaces and a margin around the edges of the paper to protect writing.