<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/48641000/jpg/_48641739_p360210-coloured_sem_of_nerve_cells_and_their_dendrites-spl-2.jpg>
<http://www.bbc.co.uk/news/health-10895816>