<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/50/320x425/548a89f2c1a6c_-_rbk-caffeine-0313-2-s2.jpg>
<http://www.redbookmag.com/body/health-fitness/advice/a14835/effects-of-caffeine/>