<http://schema.org/about>
"Recurrent sheens of oil in the Gulf of Mexico near the site of 2010's Deepwater Horizon oil spill have baffled researchers."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/wilderness-resources/stories/whats-causing-oil-sheens-near-deepwater-horizon-spill>