Your Microwave Door Is Hiding A Tiny Metal Maze

Those little holes are doing something genuinely clever every second.

Peek at your microwave door. Behind the glass sits a metal sheet dotted with small holes.

You can see your dinner spin, yet the microwaves themselves stay firmly trapped inside.

The trick is size. The holes are smaller than the waves, so the energy can't slip through them.

Visible light is far tinier, so it passes easily. That's why you watch a show but stay safe.