<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/54ffb4db2c8c1-ti-1.JPG>
<http://www.goodhousekeeping.com/institute/a22881/ti-nspire-a-new-classroom-le/?src=shelter_footer>