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What are rare earths? What's the point ? Why are they called that?

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Par Batinfo source: ADEME via YouTube

You have surely heard of "rare earths" before, but do you really know what it is? In fact, rare earths are not really earths, and they are not really rare either… This is a list of 17 chemical elements, more precisely metals, which are in Mendeleev's table, you know. , the famous periodic table of the elements.