<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/12/55093041968c4-baking-soda-mixture-de.jpg>
<http://www.goodhousekeeping.com/home/cleaning/tips/a24885/make-at-home-cleaners/>