<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54c8acd85096e_-_hand-tools-0408-1054604.jpg>
<http://www.popularmechanics.com/home/outdoor-projects/how-to/a2764/4257448/>