<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54cab6d1a6f35_-_science_fest_02_1110-lg-52007491.jpg>
<http://www.popularmechanics.com/science/g432/2010-usa-science-and-engineering-festival-pictures/>