#10 The Blue Part Of Your Eraser
We generally assume this fact that the blue part of your eraser is to erase the pen marks. But that isn't entirely true. It's main purpose was something different initially.
The blue part was originally intended to remove markings from thick paper. The pink part can often leave traces of what was written behind on the paper, whereas the blue part generally gets rid of everything. But we ended up assuming that it was to erase stuff written with ink.
#9 That Small Pocket
People often wonder about the real purpose of that small pocket within the pocket of your jeans. The general notion is that the pocket is to carry contraceptives. It sure is. But its main purpose was something else.
This design was first carried by Levi's jeans way back in 1873 and was meant to be used for pocket watches. Jean manufacturers all around the world still make these pockets to keep pocket watches.
#8 Hole On The Top Of The Cap
Ever looked at the top of the cap of your ball point? There's a hole right? Well, let's face it, it isn't for air to flow through to the lungs if it gets lodged in a person's throat.
The point is that if anything gets stuck in someone's trachea, it will cause the mucous membrane to swell in reaction. This hole is to prevent the cap from getting absorbed into the membrane.
#7 The Horizontal Buttonholes
Generally, the buttonholes in your shirt are vertical. But the buttonholes for the uppermost and lower buttons are horizontal. Why?
It is because these two places are more likely to come undone. A horizontal buttonhole makes this less likely compared to a vertical one.
#6 The Tiny Hole In The Window Of A Plane
Just because it is tiny doesn't mean that it is any less important. In fact, this tiny hole in the window of a plane happens to be the most important thing in the window design.
The tiny hole allows the air to move between the cabin and the area between the two panes, thus equalizing pressure between them. Any difference in pressure can shatter the inner glass pane.
#5 The Cylinder On Your Laptop's Charger
Ever wondered the main purpose of that cylinder on your laptop's charger? This small but very important device is called a 'ferrite bead'. It suppresses high-frequency noise in electronic circuits.
#4 The Hanging Loop On The Back Of Your Shirt
There are more than one explanation for this. Some people say that it is for hanging up your shirt. The second explanation is it may have been intended to somehow help fasten a tie.
The explanation that I love the most is a really romantic one. A student at an American university is said to have removed the loop from his shirt when he started dating a girl, to show that he was taken. For her part, his girlfriend started to wear a scarf with the emblem of his university on it.
#3 The Extra Eyelets On Your Sneakers
The extra eyelets on your sneakers is meant to fix the shoes in place on your feet and prevent them from rubbing your ankles while you're playing sport.
#2 The Scrap Material With New Clothes
The reason for this scrap material is not to sew patches on your clothes. It is to be washed with washing powder or bleach to allow you to check how your new clothes will react to certain kinds of washing/different chemicals.
#1 The Hole In A Spoon For Spaghetti
The hole in the spoon is perfect for getting the average amount of spaghetti that a person is likely to eat. This is the only explanation of the hole in a spoon to eat Spaghetti.
