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Laura Hughes receives a tip that horses are dropping dead in Wales. As she investigates, she finds decades of academic studies researching the problem. She learns these aren’t isolated incidents. Something is spreading across the countryside. It’s undetectable to humans, nobody knows it’s there — until they fall ill. For more information on how to live safely with lead, please visit the LEAPP Alliance website.

To listen to the rest of the series, find Untold on your favourite podcast platform by clicking here!

Read a transcript of this episode on FT.com

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