<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x408/54cb1fa79fe07_-_chelyabinsk-01-de.jpg>
<http://www.popularmechanics.com/science/a9634/the-chelyabinsk-lesson-beware-small-asteroids-16128813/>