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15 Household Uses for Mouthwash (Outside of Your Mouth) Photo: Pavelis (Shutterstock) Before Listerine killed germs in your mouth, it killed bacteria on bathroom floors. Yes, back in the late 1800s, Listerine, which was originally developed as a hospital-grade antiseptic and later used as “a pharmaceutical specialty for dentists,” was commonly sold to consumers as an all-purpose cleaner, used to sanitize floors, clean feet, and douse smelly armpits. The product didn’t become a household name until the 1920s, when the Lambert Pharmacal Company invented the bad breath “disease” kno...

Image Credit: Victoria Shapiro/Shutterstock.com Polished glass has always been the cornerstone of modern optics and imaging systems. Shaped precisely, it helps us focus light and produce sharp images. However, changing its focus requires physically tilting, sliding, or shifting the lens, often mechanically, which adds bulk to microscopes and telescopes. It is also hard to miniaturize the classical lenses and mirrors currently used. Metalens technology could solve this problem by exploiting light and matter interactions at the nanometer scale to achieve unparalleled control of light's behavio...