<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/768x516/54d122418d011_-_subway-06-0611-xln.jpg>
<http://www.popularmechanics.com/science/energy/g600/6-ways-to-harness-wasted-transit-energy/>