Vanadium (V)

Traditionally used as a magic ingredient to produce tougher, more wear-resistant steels, vanadium has discovered a surprising new calling in life. Could this neglected metal, and the gigantic batteries it produces, provide the perfect counterpart for temperamental wind and solar energy sources? And could a future source of the mineral be harvested from the bottom of the sea?

(Picture: Chrome vanadium adjustable spanners and bolts; Credit: runrobirun/Thinkstock)