<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/16/14/640x320/landscape-1459889509-germs-laundry.jpg>
<http://www.goodhousekeeping.com/home/cleaning/a37762/how-a-microbiologist-who-studies-germs-cleans/>