<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54ca68edb4653_-_waterslides_03_0710-lg-85184213.jpg>
<http://www.popularmechanics.com/technology/design/g191/worlds-wildest-water-slides/>