<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54caec7f7f5f6_-_surface-tension-02-0612-de.jpg>
<http://www.popularmechanics.com/science/environment/g846/world-science-festival-the-future-of-water-9340994/>