<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x320/54cacb6d589ac_-_solar-cooker-0811-de.jpg>
<http://www.popularmechanics.com/home/how-to-plans/how-to/a6818/who-needs-a-grill-build-a-hot-box-solar-oven/>