Have you ever wondered what makes your waterproof jacket repel rain or your non-stick pan slide effortlessly? The answer might surprise you—and it's not all sunshine and rainbows. Enter PFAS, or per- and poly-fluoroalkyl substances, a group of chemicals known for their durability and effectiveness in repelling oil, heat, and water. But there's a darker side to these "Forever Chemicals" that's slowly coming to light.