<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54cb38248bdf9_-_world-cup-ball-01-0514-mdn.jpg>
<http://popularmechanics.com/adventure/sports/a12962/world-cup-ball-really-is-the-most-aerodynamic-ever-16839854/>