<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/320x240/54cfd4562a52d_-_instructables-sports-05-0413-de.jpg>
<http://www.popularmechanics.com/adventure/sports/g1143/build-your-own-sports-equipment-this-spring/>