<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/65310000/jpg/_65310084_719033main_grotzinger-2-pia16706unannotated.jpg>
<http://www.bbc.co.uk/news/science-environment-21036482>