<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x320/54ca62d2cdd4b_-_drivers_03_0610-lg.jpg>
<http://www.popularmechanics.com/home/tools/reviews/g149/impact-driver-comparison-test/>