<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/54cfd537a2f6d_-_dangerous-spacewalks-03-1013-de.jpg>
<http://www.popularmechanics.com/space/g1307/10-of-the-most-dangerous-space-walks-ever-done/>