Rare earth elements have a number of useful properties that make them highly sought after by the tech and energy industries. This collection of 17 metals includes the 15 metallic elements found at the bottom of the periodic table, as well as the elements yttrium and scandium.

The most valuable of these are neodymium, praseodymium, terbium and dysprosium, which act as superstrong miniaturized magnets, a vital component of electronics, including smartphones, electric car batteries and wind turbines. However, their limited global supply is a big worry for governments and corporations that need these metals to continue manufacturing all sorts of modern essentials.

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