Two different metals, water, and a little salt: you've built a small battery.

Two different metals, water, and a little salt: you've built a small battery. In that battery one metal gets eaten.

A cheat sheet on when metals fight, the Statue of Liberty as the case study, three questions to ask before you fasten, and three ways out.

Save this for the next time two metals meet.

Sources: US National Park Service; Copper Development Association.