What 'forever chemicals' are and how to avoid them

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PFAS are a huge family of man-made chemicals - around ten thousand of them - used for decades to make things non-stick, waterproof and heat-resistant. The vast majority are legal. They’re incredibly stable, which means they can hang around in the environment and in our bodies, earning them the name “forever chemicals”. BBC Panorama investigation journalist Catrin Nye has more details. (Image: BBC)