<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54cb1e9f0c70f_-_life-on-mars-07-1013-de.jpg>
<http://www.popularmechanics.com/space/moon-mars/g1357/a-brief-history-of-life-on-mars/>