<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54c882e1b6f10_-_workbench-step1b-0807.jpg>
<http://www.popularmechanics.com/home/how-to-plans/how-to/a1952/4219723/>