An 18-year-old just did what billion-dollar water companies couldn't. Meet Mia Heller. A high school junior from Warrenton, Virginia who built a water filter in her garage that strips out 95.5% of microplastics from drinking water. That's better than most government treatment plants, which sit somewhere between 70% and 90%. Her secret weapon? Ferrofluid. A magnetized liquid made of oil and powder that latches onto microplastic particles. Then a magnet yanks them out. No membranes. No constant filter replacements. No endless maintenance bills. The ferrofluid even gets recycled, around 87% of it, in a closed loop. The spark for all of this wasn't a classroom project. It was a local newspaper article warning that her town's tap water was loaded with PFAS and microplastics, and that nobody was coming to fix it. So she watched her mom swap out filter after filter and thought, there has to be a smarter way. She built the prototype herself. Tested it with a homemade turbidity sensor. Then walked into the Regeneron International Science and Engineering Fair and walked out with a special award from the Patent and Trademark Office Society. Up against nearly 1,700 students from 62 countries. She's now eyeing a household version that sits under your kitchen sink. The future of clean water might not come from a lab in Silicon Valley. It might come from a teenager's garage in Virginia. Source: Smithsonian Magazine