<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x426/54cb0c1a5104f_-_knuckleball-01-0413-lgn.jpg>
<http://www.popularmechanics.com/adventure/sports/g1164/anatomy-of-a-knuckleball/>