<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54ca59fdefced_-_mag-lev-06-0312-lgn.jpg>
<http://www.popularmechanics.com/technology/infrastructure/g89/8-ways-magnetic-levitation-could-shape-the-future/>