<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x430/54ca63bd6e601_-_sander_test_06_1110-xl-70156091.jpg>
<http://www.popularmechanics.com/home/tools/reviews/g148/random-orbital-sander-comparison-test/>