Most people have used electrical plugs thousands of times without giving a second thought to the tiny round holes on each prong. They’re easy to overlook, so familiar that they practically disappear into the background. But those small openings are there for a reason, and the truth is far more interesting than most people expect. What looks like a minor detail is actually a clever piece of engineering — a design choice that blends safety, function, manufacturing efficiency, and everyday practicality into something you barely notice. Those holes aren’t decorative. They’re part of a system designed decades ago to ensure...
Continues…