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The specific challenge of creating the 17 elements known as rare earths—along with their alloys and compounds—from more common materials. Rare earths aren't actually rare in the earth's crust; they're just rarely concentrated enough to mine economically. They're also essential for everything from smartphones to electric vehicles to missile guidance systems. Synthesizing them would end dependence on the few countries that control their mining and processing, potentially reshaping global power dynamics. The science is difficult because rare earths are chemically similar and hard to separate, but progress is being made. The dream is a world where rare earths are as common and cheap as aluminum, and no nation can hold the world hostage by controlling their supply.
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