<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/69875000/jpg/_69875459_c0063287-x_chromosome_with_telomeres-spl.jpg>
<http://www.bbc.com/news/health-24114277>