Those unsightly black marks even have a name: mirror rot.

DESIGN
Each burner technically has a name and a specific purpose, which means there's a chance you've been using your stovetop incorrectly this whole time.
The patterns on these vintage Pyrex dishes aren’t just eye-catching—they also make this classic kitchenware extremely valuable among collectors.
LEGO bricks are notorious for being indestructible, but one color is an exception.
Road signs have changed case in the last 15 years or so—here's why.
Hiking over several feet of snow becomes possible with some clever physics and nature-inspired design.
If every plant you touch dies, LEGO’s online flower arrangement workshop may be more your speed.
Instead of breaking your old Game Boy out of storage, snap the GAMEBABY case onto your iPhone.
If your digital art is looking a little dull, try mixing colors with Mixbox.
The Mattel hovercraft was a figment of imagination, but that didn't stop kids (and their parents) from demanding where to buy one.
Most casinos lack windows, and gamblers like it that way.
The long wait for the Notre-Dame Cathedral to reopen will be over in December.
This ancient symbol, also called the Staff of Hermes, depicts two snakes intertwining around a stick that is capped by wings. It’s used as a medical logo, but for almost all its roughly 5000-year history, the caduceus had nothing to do with medicine.