<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/480x552/54d12240ce7dd_-_subway-03-0611-xln.jpg>
<http://www.popularmechanics.com/science/energy/g600/6-ways-to-harness-wasted-transit-energy/>