<http://schema.org/about>
"Toxic chemicals kill unwanted weeds, but at a cost. Labor intensive organic methods won't be adopted by industrial farms. Could lasers be the answer?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/sustainable-agriculture/star-wars-weeds-could-lasers-replace-herbicides.html>