<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54cb1c57a243d_-_solar-tech-12-1013-lgn.jpg>
<http://www.popularmechanics.com/science/green-tech/g1311/12-clever-ideas-for-a-better-cleaner-water-pump/>