<http://schema.org/about>
"It's well known that boats are an affliction for manatees. Practically all of the endangered sea cows bear scars from boat propellers, which are notorious for being a number one killer of manatees. So why don't they"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/natural-sciences/high-pitched-boat-alarm-could-be-life-saving-for-endangered-manatees.html>