<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/75305000/jpg/_75305044_g1100355-coloured_tem_of_plasmid_dna_from_e.coli_bacteria-spl.jpg>
<http://www.bbc.com/news/health-27695242>