MARK RUFFALO: It's basically what they call forever chemicals. They’re long chain fluorocarbons designed to withstand any kind of breakdown. TAMARA KHANDAKER: That's actor and activist Mark Ruffalo talking about PFAS chemicals, also known as forever chemicals. They've been around since the 1940s and used in everything from non-stick pans to takeout containers to cosmetics and fire retardant. But flash forward to today, and the long lasting manmade chemicals have been found inside Canadian blood samples brought in through the air and dust we breathe and even in our drinking water.