<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://wdy.h-cdn.co/assets/cm/15/09/54eab9f76f84e_-_05-kid-s-helmet-safety_medium-1.jpg>
<http://www.womansday.com/health-fitness/how-to/a1436/how-to-properly-fit-a-bicycle-helmet-105284/?src=shelter_footer>