<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54cb174931182_-_macbook-air-01-0713-mdn.jpg>
<http://www.popularmechanics.com/technology/gadgets/reviews/a9213/performance-testing-the-macbook-air-2013-15724009/>