<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x552/54cac93ff3b73_-_natures-timepieces-02-0711-kzkaqv-xln.jpg>
<http://www.popularmechanics.com/science/environment/g601/like-clockwork-5-of-natures-best-timepieces/>