10 Everyday Items With Hidden Features

Hole at the bottom of the plane window
If you’ve been lucky enough to get the window seat on the plane, you would have noticed the little hole at the bottom of the window. It helps with the air pressure on the plane. The window itself is made from acrylic and isn’t actually glass, which saves it from fogging up, so you can see the scenery on your journey.

The windows on planes were originally square. However, they would continuously break from the constant changes in pressure. Round windows are able to evenly distribute the pressure, ensuring you’ll have a pleasant journey without falling out!