<http://schema.org/about>
"President Obama took another step in encouraging kids concentrating in science subjects earlier this week, only this time it was a surprise. At the New York City Science and Engineering Fair at the Museum of Natural History on Tuesday,"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/corporate-responsibility/obama-drops-in-on-kids-science-fair-at-the-american-museum-of-natural-history.html>