You see, the day you start selling black market copper wire to pay for Diet Coke is the day you realize you have a serious problem.

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Smearing a small copper plate with black ink, Francesca rubbed the excess away, carefully pushing it into the etched grooves.

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Their rival electrons collide inside the "binder, " the underground black rubber sheathings that carry up to 100 copper pairs.

FORBES: Copper Hopper

Miners can use underwater robots to dig up deposits left from "black smokers, " which are little towers of metallic sulfides that form after magma forces fluids with copper, gold and other metals through the seafloor.

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