<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54cb0994ba227_-_running-shoe-tech-03-0213-de.jpg>
<http://www.popularmechanics.com/adventure/sports/g1101/the-evolution-of-athletic-shoe-tech/?click=pm_news>