<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/52553000/jpg/_52553953_c0090268-atmospheric_humidity,_computer_simulation-spl.jpg>
<http://www.bbc.co.uk/news/science-environment-18911906>