<http://schema.org/about>
"This week two scientists, Dirk Schulze-Makuch and Paul Davies, suggested in the Journal of Cosmology that it is time for humans to start colonizing Mars. Humanity needs some"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/natural-sciences/would-you-travel-one-way-to-mars.html>