The cylinder on your laptop’s power cable

This small but very important device is called a ’ferrite bead.’ It suppresses high-frequency noise in electronic circuits. Its design is incredibly simple: it has an insert made from ferrite which the cable is wrapped around.

Photo: File

Airplane windows are made of two plastic pieces put together. The tiny hole actually allows the cabin pressure and the outside air pressure at a balance.

The blue part of your eraser

Photo: File

It is true that the blue part of the paper was designed to remove the markings of the pen on paper. But what we don't know its inital purpose was to remove the paper markings from a thick paper.

The hole in a spoon for spaghetti

Photo: File

The hole in the spaghetti spoon is to measure out the correct portions of the servings. Yes it is true that some may eat more or less but the hole suggests the ideal serving per person.