<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x320/54cacba0386bc_-_falcon-blowout-0811-de.jpg>
<http://www.popularmechanics.com/military/a6829/what-probably-went-wrong-with-darpas-mach-20-flier/>