<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x320/54cb043a5f3ed_-_rare-earths-03-0113-de.jpg>
<http://www.popularmechanics.com/science/environment/a8592/a-cleaner-better-rare-earths-mine-14977859/?src=rss>