Dots on Car Windows
Did you ever wonder what those tiny dots on your car window were for? They're called "frits" and they protect the glass from extreme temperature change that could shatter it. Next time you're a passenger on a very boring journey, pay more attention to the little oddities on your vehicle.
Grating on Microwave Window
The black grate is called a Faraday shield, and it keeps microwaves from escaping through the glass. Without it, your food wouldn't cook properly, which would mean the microwaves had escaped.