<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/51/980x1268/548f736ee4f69_-_rbk-foods-that-whiten-teeth-cheese-s2.jpg>
<http://www.redbookmag.com/body/advice/g667/teeth-whitening-foods/>