<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/74380000/jpg/_74380083_first-ever-type-ia-supernova-magnified-by-a-gravitational-lens.jpg>
<http://www.bbc.com/news/science-environment-27118405>