BBC Radio has a series of 15-minute programmes, presented by Mischa Glenny, author of McMafia, which explores the world of rare earth metals and other critical raw materials. It starts by explaining what the 17 rare earth metals are and their weird and wonderful applications. It also explains how China has managed to dominate the mining and refining of them.
https://www.bbc.co.uk/programmes/m001cdr6
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