<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x430/54cad89b5ffc2_-_pedal-power-06-1111-xln-33812270.jpg>
<http://www.popularmechanics.com/science/green-tech/g687/7-ways-pedal-power-will-change-the-world/>