<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54caf187c823e_-_human-powered-contraptions-09-0712-de.jpg>
<http://www.popularmechanics.com/adventure/g893/9-unusual-human-powered-contraptions/>