US stockpiles of the rare earth minerals it would need to fight a war against an adversary like China are a mystery, and experts warn it's a problem

US stockpiles of the rare earth minerals it would need to fight a war against an adversary like China are a mystery, and experts warn it's a problem

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Rare earth minerals are needed to make all sorts of things, from F-35 stealth fighters and night-vision goggles to internet fiber-optic cables and MRI machines.

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