This Rock-Slicing, Nanotechnology-Packing Super Steel Was Forgotten 250 Years Ago

This Rock-Slicing, Nanotechnology-Packing Super Steel Was Forgotten 250 Years Ago: "6th century Metalworkers in India and Sri Lanka were the first to begin crafting the incredibly strong material, shocking Europeans with their weaponry that didn't lose its sharpness and seemed able to cut through anything in its path—as well as gleaming with a dazzling marbled pattern. And underneath it all, visible only now—two an a half centuries later—are amazingly complex carbon nanotubes. Then, abruptly, the weapons started to vanish around 1750. And nobody knows why. More importantly, nobody knows how—the secret behind the nanotech steel's production was lost to history, and hundreds of years of debate and research still hasn't settled the matter."