<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/480x360/54cfd456b8340_-_instructables-sports-08-0413-lgn.jpg>
<http://www.popularmechanics.com/adventure/sports/g1143/build-your-own-sports-equipment-this-spring/>