15 Everyday Items With A Secret Hidden Purpose

2. The Holes on the Airplane’s Windows

If you’ve ever flown across the country on a window seat on an airplane and noticed a small hole at the bottom of the window, it’s quite normal to worry and maybe think that the window is damaged or something. But fret and panic no more, these airplane windows are actually designed that way! Holes at the windows are designed so that they regulate the air pressure difference between the exterior and the interior of the plane. It also serves to prevent the windows from fogging up, enabling you to take stunning photos of the clouds!