Drive a hybrid car? Then you're using lanthanum (No. 57 on the periodic table).
Reuters reported last year that a single Toyota Prius electric motor requires 1 kilogram (2.2 lb) of neodymium, and each battery uses 10 to 15 kg (22-33 lb) of lanthanum. "The Prius hybrid automobile is popular for its fuel efficiency, but its electric motor and battery guzzle rare earth metals, a little-known class of elements found in a wide range of gadgets and consumer goods," according to the British news agency.
Lanthanum is also essential in some superconductors, as the Monitor reported in 2008.