We bet not even the nosiest person to ever live could have noticed the micro hole in each and every plane window! The micro hole is located in the middle pane of the layered window
The hole was designed to maintain a level cabin pressure, if one of the other panes were to ever burst or crack!
Air pressure is 1.5 kilograms when flying thousands of feet in the air – which would automatically put any passenger unconscious if it weren’t for the man made air pressure of 3.5 kilograms per square inch
The hole also serves as a vent to prevent extreme fog from filling the cabin and windows, due to breathing.