<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54caa0117f983_-_cpvarraycloseup_400_0410.jpg>
<http://www.popularmechanics.com/science/energy/a5592/concentrating-solar-pv-power/>