5 usual things whose purposes we don't know
In the world we are surrounded by hundreds of things.Many things we use every day.And there are some things which we consider usual but whose purpose we don't know.In this post I will tell you about 5 things whose purposes for many people are mystery.
Blue part of eraser
How many different theories are there about blue part of the eraser...
Many sincerely believe that it is possible to erase the ink with it but actually it is used only to erase the pencil on a harder paper or cardboard.
Internal small pocket jeans
In truth why is it needed?
Almost all jeans have this little pocket.You can use it how you want,but the true purpose this pocket is carrying pocket watch.It even is called "watch pocket".
Cylinder on the wires of charger
Many people noticed it but only few know its purpose.
This cylinder's name is "Ferrite filter"and it improves the quality of digital signal and suppression of high-frequency noise in electrical circuit.
Hole in window
If you often fly you notice a small hole in windows.You may thought:"For what?"
Internal and external glasses of window are made of different materials.External is stronger.While flying bitween glasses big difference in pressure is forming.This hole is needed to the glass doesn't burst.
Pompons
Pompons have already become a decoration hats. But for what it was used in past?
More then 200 year ago French seamans often hit the ceiling and decided to sew pompons to the hats.And we got the first hat with pompons.