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PFAS chemicals are all around us. They're used in frying pans, food packaging and waterproof coats but they have been linked to thyroid disease, liver damage and cancer. The trouble is that PFAS just doesn't go away- these 'forever chemicals' build up in our bodies and the environment. Tom Heap and Helen Czerski look back at the invention of these miracle chemicals, their use in the Second World War and the Space Race and meet Robert Bilott, the American lawyer who held the PFAS manufacturers to account, going head to head with the enormous DuPont corporation. They're also joined by Stephanie Metzger of the Royal Society of Chemistry, Hannah Evans from the environmental charity Fidra and by the journalist Leana Hosea of Watershed Investigations. Producer: Alasdair Cross Assistant Producer: Toby Field Rare Earth is produced in association with the Open University