<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54caab52e9c10_-_definity-led-de.jpg>
<http://www.popularmechanics.com/science/green-tech/a6040/will-led-light-bulbs-best-cfls-and-incandescents/>