<http://www.w3.org/1999/02/22-rdf-syntax-ns#rest>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#nil>
<http://www.popularmechanics.com/science/health/a7173/lab-created-blood-vessels-ready-made-for-any-patient/?src=soc_fcbk>