<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/15/31/640x251/gallery-1438194565-drake-equation.jpg>
<http://www.popularmechanics.com/space/deep-space/a9352/the-case-for-alien-life-15756398/>