<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/73627000/jpg/_73627518_c0141243-big_bang_and_galaxies,_artwork-spl.jpg>
<http://www.bbc.com/news/science-environment-27935479>