<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/54d0e86d9d204_-_magnify-overlay-200x150.gif>
<http://www.popularmechanics.com/space/a5448/behind-the-air-forces-secret-robotic-space-plane/>