<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54cb11117adee_-_bike-power-meters-03-0513-de.jpg>
<http://www.popularmechanics.com/adventure/sports/g1191/the-best-cycling-power-meters/>