Here's a preview of a new show from the Financial Times, Untold: Toxic Legacy.

How can somewhere that looks so beautiful be so contaminated? 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.

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