<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54ca7f3031b00_-_porter-cable-97311-470-0209.jpg>
<http://www.popularmechanics.com/home/tools/reviews/a12245/4301779/>