Everyday Things you never knew had a purpose.
These are things we use everyday which has features and functions we don't understand or ignorant of their uses. 1. Tiny hole in airplane window.  The tiny holes are for two reasons. One is to compensate air pressure as when the airplane climbs to high altitude there is huge pressure difference between the inside & the outside of the plane. The second reason is that it prevents the windows from fogging up. 2. Car Headrest.  One other use which majority of us are not aware of. If your car gets submerged in water or in an accident you can detach the headrest and can use the metal part to break the wind screen. 3. The blue side of eraser.  Did you know that the blue part of an eraser is used to clean writing on the wall or on any hard surface while the red or white one is used to clean writing on paper. 4. Black hole between flash and camera.  The tiny hole is a microphone which record the ambient noise, not your voice, because whe...