<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/57832000/jpg/_57832478_p3320456-white_matter_fibres,_dti_scans-spl.jpg>
<http://www.bbc.co.uk/news/health-16505521>