<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54ca6f8eb42d0_-_speaker-12-0808.jpg>
<http://www.popularmechanics.com/technology/audio/how-to/a3485/build-your-own-speakers/?click=pop_more>