<http://schema.org/about>
"Watching someone else yawn can be a one-way ticket to doing the same. Now, research finds that the same is true for dogs \u2014 but not puppies."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/family/pets/stories/puppies-learn-to-catch-yawns-as-they-grow>