<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x320/54ca62d6e6108_-_drivers_10_0610-lg-29161408.jpg>
<http://www.popularmechanics.com/home/tools/reviews/g149/impact-driver-comparison-test/>