<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/58777000/jpg/_58777393_a1130080-cdf_particle_detector,_fermilab-spl.jpg>
<http://www.bbc.co.uk/news/science-environment-17269647>