During World War II, pennies were made of zinc-coated steel to save copper for the war effort. However, a few of the copper ...

Re “So long, penny! Trump orders U.S. to ditch 1-cent coin after decades of complaints” (Feb. 10): Consider this solution to the penny problem. In 1943, copper became so dear that to ...

A copper penny appears to turn to silver after heating in an evaporating dish with a mixture. The penny then appears to turn to gold when heated in a flame. Heat causes a fusion of zinc and copper to ...