<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/68549000/jpg/_68549104_sciencelesson(vtfreezeframecopyright-nonbbc).jpg>
<http://www.bbc.co.uk/news/education-23181672>