<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54cb0a74cbce5_-_bho-microscope-04-0313-de.jpg>
<http://www.popularmechanics.com/science/g1128/a-brief-history-of-the-microscope/>