<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54ca6983e0f7b_-_alt_engines_04_0810-lg-58448258.jpg>
<http://www.popularmechanics.com/cars/g195/5-alternative-engine-architectures/>