<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54cb09282ca81_-_small-generators-05-0213-lgn.jpg>
<http://www.popularmechanics.com/home/tools/reviews/g1099/which-small-generator-is-the-toughest/>