<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/320x160/54cfd37c51045_-_math-museum-01-1212-lgn.jpg>
<http://www.popularmechanics.com/technology/g1020/6-ways-to-expand-your-mind-at-the-math-museum/>