<http://www.w3.org/1999/02/22-rdf-syntax-ns#rest>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#nil>
<http://www.popularmechanics.com/adventure/sports/a11141/these-helmets-will-save-the-nfl-from-itself-17124971/?click=pm_news>