<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/16/40/1475768903-screen-shot-2016-10-06-at-94130-am.png>
<http://www.popularmechanics.com/space/a23244/drake-equation-intelligent-alien-life-in-the-galaxy/>