<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x273/54cb38240c900_-_world-cup-ball-02-0514-de.jpg>
<http://popularmechanics.com/adventure/sports/a12962/world-cup-ball-really-is-the-most-aerodynamic-ever-16839854/>