Everyday Things You Never Knew Even Had A Purpose
You’re using everything incorrectly. Not anymore.
1. Think the hole in the lid keeps the ballpoint from drying out?
A lot of people think the hole in the cap of a ballpoint pen is there to keep the pen from drying out, or that it’s there to keep a pressure balance that prevents the pen from leaking. The real reason it’s there is much more straightforward:
It’s there to lower the risk of suffocation. If a small child was chewing on the cap and choked on it, the hole keeps their airway from closing up entirely.
2. Ever notice the little holes in the windows of airplanes?
That little hole is there for two reasons:
The first reason is to compensate for air pressure. When the plane climbs to cruising altitude, there’s a huge pressure difference between the inside and outside of the plane. The hole is there to regulate some of that difference so that the outer window doesn’t have to do all the work.
The other reason is that it prevents the windows from fogging up.