<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54ca6f22390b1_-_3inventions-3-0808-70162639.jpg>
<http://www.popularmechanics.com/science/green-tech/a3384/4273679/>