<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/50/548a3b1166b3c_-_sleep-positions-1011-2-msc.jpg>
<http://www.redbookmag.com/love-sex/relationships/advice/a12647/sleep-positions/>