<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54ca70a4c79c7_-_08-bbq-propane-gauge-0808-53718038.jpg>
<http://www.popularmechanics.com/technology/gadgets/reviews/a3444/4277008/>