<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/480x552/54fe3a13673a4-crest-whitestrips-0211-xl.jpg>
<http://www.goodhousekeeping.com/institute/g12/innovative-products-from-the-past-decade/?src=shelter_footer>