The gap between the surface of the screen and the bottom of the laptop is so tiny that when you close the lid, any dust particle, even so small you can barely s

The gap between the surface of the screen and the bottom of the laptop is so tiny that when you close the lid, any dust particle, even so small you can barely see them, gets squashed against the screen. When you leave the laptop charging for a while, static seems to build up on the screen, and it attracts dust particles. You can tell this is not an incidental thing if you examine the surface of a 2 year old screen. Even if you don't have visible scratches, you can see the contours of the trackpad on the screen, where the gap is a fraction of an inch wider, and the screen stays more pristine.