<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x368/54cad89a27948_-_pedal-power-03-1111-xln-26588076.jpg>
<http://www.popularmechanics.com/science/green-tech/g687/7-ways-pedal-power-will-change-the-world/>