<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x426/54cb0bcf3f16f_-_router-bits-09-0413-de.jpg>
<http://www.popularmechanics.com/home/tools/reviews/g1135/10-router-bits-every-diyer-should-own/>