<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54cb11123b6bd_-_bike-power-meters-05-0513-lgn.jpg>
<http://www.popularmechanics.com/adventure/sports/g1191/the-best-cycling-power-meters/>