<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/54d0e83b4132a_-_diy_luge_05_0111-xl-57594877.jpg>
<http://www.popularmechanics.com/adventure/sports/a6401/how-to-build-your-own-backyard-luge/>