<http://schema.org/about>
"Can smiling really boost your mood? WSJ's Christina Tsuei takes a look at the science behind smiling, in this latest installment of 'Is It True?'"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/research-innovations/videos/is-it-true-smiling-improves-your-mood>