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Rare earth metals are making headlines as demand rises for products from smartphones to wind turbines, and as governments seek secure supply.

Lanthanum and cerium are among the most common rare earth metals. Lanthanum is used in camera lenses and lighting. Cerium is used in catalytic converters, which reduce combustion engine emissions.

Lanthanum and cerium are among the most common rare earth metals. Lanthanum is used in camera lenses and lighting. Cerium is used in catalytic converters, which reduce combustion engine emissions.