<http://schema.org/about>
"In developing countries - where food is scarce and reliable energy supplies are even scarcer - necessity often becomes the mother of invention; so it is in Uganda, where farmers have resorted to using human urine and excreta -"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/human-poop-and-urine-provide-cheap-biogas-source-in-uganda.html>