<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x240/54ca59fcb448c_-_mag-lev-02-0312-lgn.jpg>
<http://www.popularmechanics.com/technology/infrastructure/g89/8-ways-magnetic-levitation-could-shape-the-future/>