What's green, greatly coveted, and offers extraordinary power to he who possesses it? For comic-book fans, the answer is the power ring wielded by the enigmatic Green Lantern, one of the most popular superheroes ever created by DC Comics. In the real world, the answer is not too dissimilar: It's "green" lanthanide, a blanket term for more than a dozen "rare earth metals" that are used in a range of increasingly important defense and technology applications.
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