Microplastics are used everywhere from laundry detergent to agriculture. Biotech startup Calyxia is making a new version of the tiny capsules that dissolve in nature. Microplastics are everywhere, from Arctic snow and the deepest corners of the ocean to bottled water, table salt, and your baby’s poop. The source of the problem is sometimes less than obvious—laundry detergent, for example, is typically made with plastic microcapsules to hold fragrance.