<http://schema.org/about>
"The rate of babies born in the United States hit a record low in 2011, a new analysis shows. Researchers say the drastic drop in the birth rate among immigrants"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/health/fitness-well-being/stories/us-birth-rate-hits-new-low>