<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/51/980x551/548fc6a42408f_-_rbk-foods-that-whiten-teeth-onions-dhm9ru-s2.jpg>
<http://www.redbookmag.com/body/advice/g667/teeth-whitening-foods/>