According to folklore, silver bullets kill werewolves, but in the real world, researchers want to harness this metal to fight another deadly foe: bacteria. Recently, scientists have tried to develop a silver coating for implantable medical devices to protect against infection, but they've had limited success. In a study in ACS Central Science, one team describes a new, long-acting silver-ion releasing coating that, in rats, prevents bacteria from adhering to implants and then kills them.