Photos: Gadgets to fight germs, fat, and frizz

Guardian Technologies also makes household vacuums that use UV-C light to kill bugs the naked eye can't see. The GermGuardian vacuums come in a range of sizes and cost between $100 and $230. The company's humidifiers, with nanosilver injection molded within, are supposed to prevent bacteria from building up. Guardian also sells a cordless handheld vacuum that doubles as an air sanitizer, as well as a chamber that uses dry heat to clean kids' small toys.